Azobenzene wavelength

Azobenzene - Wikipedi

The still unknown azobenzene - wavelength dependent

Azobenzene derivatives exist in two kinds of molecular configuration with two corresponding energy states, namely, the trans and the cis forms. These molecules are spectroscopically characterized by a low energy n-π* band in the visible region and a high energy π-π* band in the UV region. The trans form of azobenzene is thermodynamically more stable than the cis form and hence the. Azobenzene can be efficiently and reversibly switched between two structurally different forms upon exposure to different wavelengths of light and, as such, it is the molecule of choice for constructing light-powered molecular machines. The studies described herein show that several structurally different azobenzenes can be encapsulated within the cavity of a flexible, water-soluble molecular. The α-hemolysin (αHL) pore was used as a nanoreactor for the direct observation of the reversible photoisomerization of individual tethered azobenzene molecules in an aqueous environment. αHL pores, PAZO, were used that had been derivatized within the lumen at a single cysteine residue with 4-((4-(2-chloroethanoamido)phenyl)diazenyl)benzenesulfonate. Trans−cis isomerizations were. Azobenzene is one of the most ubiquitous photoswitches in photochemistry and a prototypical model for photoisomerizing systems. Despite this, its wavelength-dependent photochemistry has puzzled researchers for decades. Upon excitation to the higher energy ππ* excited state instead of the dipole-forb

Azobenzene is a typical photo-responsive molecule that isomerizes from its planar trans-form to the non-planar cis-form after UV-light irradiation with a wavelength between 300 nm and 400 nm (lmax is around 330 nm). Interestingly, the system reverts from the cis-form to the trans-form after further irradiation with visible light (wavelength. Enhanced Deformation of Azobenzene-Modified Liquid Crystal Polymers under Dual Wavelength Exposure: A Photophysical Model. Liu L(1), Onck PR(1). Author information: (1)Micromechanics of Materials, Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, The Netherlands

Azobenzene - an overview ScienceDirect Topic

  1. Azobenzene photoswitches 1 are at the core of most recently developed strategies to manipulate biological functions with light 2,3,4, which among other systems, enable remote control of cell.
  2. The still unknown azobenzene - Wavelength dependent photoanisotropy in amorphous azobenzene polymers . P. S. Ramanujam, * Ole Bjarlin Jensen, and Peter Tidemand-Lichtenber
  3. @article{osti_1779442, title = {Nonadiabatic Dynamics Simulation of the Wavelength-Dependent Photochemistry of Azobenzene Excited to the nπ* and ππ* Excited States}, author = {Yu, Jimmy K. and Bannwarth, Christoph and Liang, Ruibin and Hohenstein, Edward G. and Martínez, Todd J.}, abstractNote = {Azobenzene is one of the most ubiquitous photoswitches in photochemistry and a prototypical.
  4. 26 June 1998 Chemical Physics Letters 290 Ž1998. 68-74 Femtosecond time-resolved UV-visible absorption spectroscopy of trans-azobenzene: dependence on excitation wavelength I.K. Lednev a , T.-Q. Ye a , P. Matousek b, M. Towrie b, P. Foggi c , F.V.R. Neuwahl c , S. Umapathy d , R.E. Hester a , J.N. Moore a,) a Department of Chemistry, The UniÕersity of York, Heslington, York YO1 5DD, UK b.
  5. Figure 3(a) shows the absorption spectrum of azobenzene in solution and the fluorescence emission spectrum of azobenzene molecular wires at the excitation wavelength of 467 nm. According to previous works, the absorption band peaked at ∼450 nm can be easily assigned as the S 1 ← S 0 ( n-π* ) transition, corresponding to the tail of the.
  6. Irradiation at 578 nm, corresponding to excitation of the interligand CT transitions, results in cis-to-trans conversion of both 1 and 2, which is the longest wavelength ever reported to effect the photoisomerization of the azobenzene group

Full Paper Control of Photodynamic Motions of Azobenzene-Derivative Polymers by Laser Excitation Wavelength Mi-Jeong Kim,* JaeDong Lee, Chaemin Chun, Dong-Yu Kim, Seiji Higuchi, Tomonobu Nakayama The dynamic properties of photoinduced alignment and surface relief grating (SRG) formation as a function of excitation wavelength (lex ¼ 454, 488, 514, 532, 568, and 647 nm) are examined using five. Developing azobenzene photoswitches capable of selective and efficient photoisomerization by long-wavelength excitation is an enduring challenge

Azobenzene 98% 103-33-

A new cyclic chiral azobenzene compound Azo-o-Bi was synthesized, which exhibits photochemically reversible cis-trans isomerization in both organic solvents and liquid crystal hosts. When doping into a nematic liquid crystal, it displays high helical twisting power (HTP, β) and a large change in HTP (Δβ) due to photoisomerization. Therefore, we are able to reversibly tune. Azobenzene is a well known photoswitchable molecule that changes its properties under blue light. By inducing conformational change and altering their refractive index, Kovach et al. modified the resonant wavelength of azobenzene molecules to create tunable microresonators

Photoisomerization in different classes of azobenzene

Investigation of UV-vis spectra of azobenzene containing

Azobenzene is one of the most ubiquitous photoswitches in photochemistry and a prototypical model for photoisomerizing systems. Despite this, its wavelength-dependent photochemistry has puzzled researchers for decades. Upon excitation to the higher energy ππ* excited state instead of the dipole-forbidden nπ* state, the quantum yield of. Azobenzene can be used as an optical trigger for the design and synthesis of a large variety of photoresponsive systems. Photochromic compounds that undergo large conformational changes when exposed to light of appropriate wavelength are particularly attractive as molecular switch elements. Azobenzene is a popular choice among the chromophores Spectroscopy and dynamics of the S 1 (nπ*) state. Figure 2a shows the S 1 (nπ*)←S 0 excitation spectrum of trans-azobenzene in the 18,250-20,750 cm −1 region, as detected by (1+1.

Azobenzene photomechanics: prospects and potential

Using an azobenzene-based ion channel blocker as an example, this protocol describes a (1)H NMR assay that can be used to precisely determine the isomeric content of photostationary states (PSSs) as a function of illumination wavelength. Samples of the photoswitchable ligand are dissolved in deuterated water and analyzed by UV/VIS spectroscopy. The light-triggered isomerization of azobenzene to its metastable Z isomer can be reversed thermally or with another wavelength of light (center). Alternatively, redox chemistry can be used to trigger a catalytic chain to enable quantitative isomerization back to the thermodynamically more stable E isomer The excitation wavelengths of 388 and 420 nm have been located at exactly opposite sides of the trans azobenzene absorption band. A third irradiation wavelength was shifted to 438 nm. Distinct saturation levels and growth dynamics of photoinduced birefringence have been observed under the 388- and 420-nm illumination, while very similar. Many dye molecules feature an azo bond (N=N). Azo-based dyes, such as azobenzene (C12H10N2), can undergo a transformation known as photo- isomerization when exposed to a certain wavelength of light. If the barrier to photo- isomerization for azobenzene is 205 kJ/mol, what is the maximum wavelength of light (in nm) required for this transformation

Nanoporous Membranes With Tunable Molecular Separation

Optically tunable microresonator using an azobenzene

  1. azobenzene PSC-01, which will be stimulated by green through UV light. Therefore, the PVG sample was first exposed with UV light to move the central wavelength to 630 nm, and then a He- Ne laser (633 nm) was used as probing beam for measuring response time. The duration of each voltage setting was 30 ms
  2. Within this visible range, the azobenzene molecule can be reliably converted from trans to cis with red light (660 nm), and converted back to trans with violet wavelength light (410 nm) and/or thermal relaxation. We also report the gene-silencing ability of these Cl-siRNAzos in cell culture as well as their reversible control with visible light.
  3. Azobenzene-Tethered Bis(Trityl Alcohol) as a Photoswitchable Cooperative Acid Catalyst for Morita-Baylis-Hillman Reactions Prof. Dr. Tatsushi Imahori , Corresponding Autho
  4. A fibre Bragg grating sensor is coated with a novel polymer gel in order to investigate its suitability for nondestructive measurement of moisture in materials that can potentially lose their integrity due to moisture ingress. Absorption and desorption of moisture lead to swelling/shrinkage of an azobenzene-based gel, which induces a strain in the Bragg grating resulting in wavelength shifts

Advances in Application of Azobenzene as a Trigger in

Long-wavelength light drives the azobenzene moiety into its extended trans configuration, allowing the blocker to reach the pore. Short-wavelength light generates the shorter cis configuration, retracting the blocker and allowing conduction The more interesting point for such a hydrogel was its visible-light responsibility for gel-sol reversible phase transition. This originated from the introduction of an electron-donating group (dimethylamino) to azobenzene, which noticeably red-shifted the responsive wavelength for its trans-to-cis isomerization isomerization of the azobenzene functionality triggered the release of the dye from the pores. This light-induced release of cargo can be modulated between an on and an off state by controlling the conformation of the azobenzene with the appropriate wavelength of light. This report highlights th

The laser-initiated thermal (optothermal) switching of cholesteric liquid crystals (CLCs) is characterized by using different azobenzene (Azo) derivatives and laser wavelengths. Under 405-nm laser irradiation, Azo-doped CLCs undergo phase transition from cholesteric to isotropic induction experiments of azobenzene derivatives using shorter wavelengths (200−320 nm) as light source. This is because the intense π-π* and/or n-π* transitions exist at ≈ 350 nm associated with weak electronic transitions at ≈ 400-500 nm. We think that most researchers had n

  1. Excitation wavelength dependent surface-enhanced Raman spectra of a dipping film of azobenzene-containing long-chain fatty acid on a silver mirror. Jung YM(1), Sato H, Ikeda T, Tashiro H, Ozaki Y. Author information: (1)Department of Chemistry, School of Science and Technology, Kwansei Gokuin University, Sanda, Japan. ymjung@postech.ac.k
  2. ed by the duration and intensity of the 450 nm light and the density of azobenzene functional groups on the device surface, providing multiple control mechanisms
  3. After removing the polymer film, the hologram recorded in the plate can be reconstructed using a visible-wavelength laser beam. The first-order diffraction efficiency of the hologram at a wavelength of 532 nm is 0.03%; the efficiency depends on the depth of the surface relief structure on the azobenzene polymer film and the corona-charging time
  4. Beamco.com - Fast azobenzene liquid crystals with enhanced visible photosensitivity. New azobenzene LCs have enhanced photosensitivity for visible wavelengths and can be used for optical switching of nanosecond pulses as well as cw laser beams. Material Name. Tc [ o C
  5. Depending on the wavelength of the light absorbed, Quantum chemical investigation of thermal cis-to-trans isomerization of azobenzene derivatives: substituent effects, solvent effects, and comparison to experimental data. J. Phys. Chem. A, 113 (24) (2009), pp. 6763-6773
UV-Vis Spectroscopy: Absorbance of Carbonyls - Master

An azobenzene derivative with two iodide units (Azo-I) was synthesized using reported procedure.2 (4 W) with 365 nm wavelength. After 5 min of UV irradiation, CD spectra were obtained. CD spectra with Na2S2O4 were obtained after 5 min of Na2S2O4 addition (10 eq., 400 μM) Multifunctional TiO2/ormosils organic-inorganic hybrid films that contain azobenzene and photosensitive groups are prepared by combining a low temperature sol-gel process and a spin-coating technique. The optical waveguide and the structural properties of the hybrid films are characterized and investigated respectively by different techniques. The photo-responsive properties of the hybrid.

First, the remote-controllable light shutter is successfully demonstrated based on the reversible trans-cis photo-isomerization of azobenzene group in the smectic A mesophase wavelengths.12-14 Previously, we described photochemically controlled PCCA photonic crystals, which operated in organic solvents such as dimethylsulfoxide (DMSO), which utilized azobenzene and spirobenzopyran photochemistry.15 In our azobenzene-functionalized PCCA, the photochemistry involved photoisomerization between the trans and cis isomers.

Reversible photoswitching of encapsulated azobenzenes in

  1. wavelength as the writing beam. The molecular photoinduced reorientation usually takes place in fluid systems such as liquid crystals. However, the azobenzene derivatives can be oriented in solid matrices by polarized light due to the accompanying process of trans- cis-trans isomerization.4,5 The trans azobenzene derivative
  2. wavelength region by substituting electron donor and acceptor groups on azobenzene.[1] A continuous trans- cis-trans photoisomerization cycle can then occur at the same l ex. It is a basic photonic motion that enables an azobenzene-containing polymer to respond to polarized light and an interfering laser beam. By the use of linearl
  3. photo-irradiation at wavelengths > 400 nm and a nonplanar cis form is obtained by photo-irradiation at 300 nm - 400nm. Therefore, azobenzene can reversibly photo-isomerize between trans and cis forms upon irradiation with the appropriate wavelength of light. On the basis of this property, azobenzene can be used as a photo-switch in a DNA

Aqueous azobenzene switching. Photoswitching molecules can enable targeted delivery of drugs in the body, but the body is best penetrated by near-infrared radiation (wavelengths between 700 and 900 nanometers). Most photoswitching processes in molecules require shorter wavelengths, and high light intensities are needed to trigger two-photon. Abstract: Azobenzene chromophores can be switched between two geometric isomers using visible light. This photoisomerization is rapid, reversible, and of high quantum yield, and the wavelengths effecting the transformation can be tuned synthetically with substituent groups to the chromphores the wavelength of exposed light.10,11) For liquid crystalline azobenzene materials, cis isomer formation reduces the liquid crystalline characteristics and decreases the transition temperatures.12) In the case of push-pull type azobenzene molecules, trans-cis photoisomerization and thermal cis- trans back isomerization occur quickly. In.

While the naked azobenzene 1h has the absorbance maximum in the bluest part of the spectrum (λ max (1h) = 322 nm), substitution on the azobenzene in the 4´-position leads to a bathochromic shift, which is smaller for electron-withdrawing groups (λ max (1g) = 328 nm; λ max (1i) = 342 nm) and more pronounced for electron-donating groups. Novel azobenzene polyelectrolytes have been used to fabricate biocompatible self-assembled multilayer (SAMU) thin films of variable absorbance, thickness, organization, and morphology. λ max p of the SAMU films move to lower wavelength relative to solution to exhibit a blue shift for the hydrophobic R-groups, while this behaviour was not. Herein, the photoorientation processes under the action of the polarised UV (355 nm) and visible (457 nm) light are studied for the amorphousized films of new azobenzene-containing polymethacrylates with different lengths of alkyl spacers and tails (5, 6 and 10 methylene units) tation wavelengths have been located at exactly opposite sides of the trans azobenzene absorption band (i.e., 388 and 420 nm). Third wavelength has been shifted to 438 nm. To the best of our knowledge, the experimental studies of the photoinduced birefringence growths in azobenzene-deriv-ative polymers under the irradiation of the wavelengths

Azobenzene-embedded liquid crystal polymers can undergo mechanical deformation in response to ultraviolet (UV) light. The natural rodlike trans state azobenzene absorbs UV light and isomerizes to a bentlike cis state, which disturbs the order of the polymer network, leading to an anisotropic deformation. The current consensus is that the magnitude of the photoinduced deformation is related to. glutamate receptors (GluRs) are based on an azobenzene photo-switch that is optimally switched into the liganding state by blue or near-UV light, wavelengths that penetrate poorly into the brain. To facilitate deep-tissue photoactivation with near-infrared light, we measured the efficacy of two-photon (2P) excitation fo

Photo-responsive systems and biomaterials: photochromic

Description Azobenzene can be used as an optical trigger for the design and synthesis of a large variety of photoresponsive systems. Photochromic compounds that undergo large conformational changes when exposed to light of appropriate wavelength are particularly attractive as molecular switch elements Abstract. Introduction: Machine Learning (ML) methods for modeling properties of molecules are an extremely promising area of research. The goal of our work is to develop an ML framework for modeling the absorption spectra of azobenzene molecules—an important class of industrial dyes with many current and potential applications at a shorter wavelength and a weak n-π* band in low energy region (Figure 1). The photo-switching prop-erties of azobenzene derivatives are dependent on the substituents at the phenyl rings. Their modification causes a change in the position of energy states n-π* and π-π* bands. The improvement of the photo Optically switchable multi-stopband of non-quarter-wavelength dielectric multilayer using azobenzene polymer liquid crystal Ryotaro Ozaki 1*, Kazunori Kadowaki , Takashi Hagio2, Ryohei Yagi 2, Yutaka Kuwahara , and Seiji Kurihara2 1Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan 2Graduate School of Science and Technology, Kumamoto University, Kumamoto. Multifunctional TiO2/ormosils organic-inorganic hybrid films that contain azobenzene and photosensitive groups are prepared by combining a low temperature sol-gel process and a spin-coating technique. The optical waveguide and the structural properties of the hybrid films are characterized and investigated respectively by different techniques

Photoisomerization of an Individual Azobenzene Molecule in

Attached azobenzene molar absorption coefficients 1. epsilon.dat The values of the molar absorption coefficients of trans- and cis-azobenzene (second and third column, respectively) associated with the wavelengths given in the first column. Attached example of measured data 1. concentrations.da We demonstrated a nonvolatile grating using an azobenzene polymer film with polarized two color beams. The reorientation of azobenzene molecules can be optimized when the two color light beams are polarized perpendicularly. The stored information can be read repeatedly without volatility with the same wavelength as the writing beam Different Wavelengths The study of photochemical phase transition in LCPs started with the incorporation of azobenzene moiety, which is a well-known chromophore that can serve as both the photo-responsive group and the mesogen.[9] The most interesting property of azobenzene molecules is the fact that the switc surfaces.The photoisomerization of azobenzene can be triggered by illumination at the appropriate wavelength. Azobenzene undergoes trans-to-cis isomerization when irra-diated with ultraviolet (UV) light (365 nm). Theconforma-tional change can be reversed by blue light (450 nm), but it can also be caused thermally in the dark owing to the greate Several Raman excitation profiles of trans‐ azobenzene in carbon tetrachloride have been obtained in the wavelength range 361-494 nm. By using 21 different exciting wavelengths from a tunable pulsed dye laser the eight most intense Ramanlines occurring in the 1000-1600 cm−1 shift range were investigated and the effective absorption wavelengths λeff were located. The results indicate.

Nonadiabatic Dynamics Simulation of the Wavelength

We demonstrate azobenzene photochemically driven diffraction switching of a photonic crystal consisting of a crystalline colloidal array (CCA) polymerized within a hydrogel matrix. A novel azobenzene derivative that has a large ground-state activation barrier between the cis and trans forms in water is used. The system is actuated by excitation with UV light (wavelength of 365 nm), which. Azobenzene undergoes reversible cis↔ trans photoisomerization upon irradiation. Substituents often change the isomerization behavior of azobenzene, but not always in a predictive manner. We have synthesized several (aminomethylpyridine)azobenzene (AzoAMP) derivatives with unusual optical properties. These AzoAMPs exhibit minimal trans →cis photoisomerization, extremely rapid cis→trans. azobenzene (~12 kcal mol 1) characterized by vanishing dipole moment isomerizes via irradiation with near-ultraviolet (UV) light ( = 300-400 nm); the cis form is characterized by a dipole moment of ~3 D [22]. In addition, the isomerization reduces the separation between the carbon atoms at the para positions of the azobenzene rings from 9.0. 103-33-3 - DMLAVOWQYNRWNQ-BUHFOSPRSA-N - Azobenzene - Similar structures search, synonyms, formulas, resource links, and other chemical information Here we report the orthogonal and reversible control of two distinct types of photoswitches in one solution, that is, a donor-acceptor Stenhouse adduct (DASA) and an azobenzene. The control is achieved by using three different wavelengths of irradiation and a thermal relaxation process

Azobenzene Phosphoramidite - Glen Researc

Azobenzene strongly absorbs ultraviolet (UV) light and blue/green light which limits the efficiency of the photomechanical response under solar irradiation. Photon upconversion — combining two or more low energy photons (longer wavelength) to generate a higher energy excited state (shorter wavelength), provides an intriguing strategy to drive. 80 polymer contained only 5% azobenzene units but still -3. Incorporation of such a polymer into an integrated Bragg grating device would allow for a latched reconfiguration of the Bragg wavelength without the need for continual electrical 85 input by photo-switching between isomeric states relaxed state, azobenzene exists entirely in the trans configura tion. Upon illumination, a steady state mixture is generated, with a fraction of the azobenzene in the eis configuration and the rest in trans. The balance between eis and trans (the photostationary state) depends on the wavelength of irradiation. The eis pop

Light-induced wide range color switching of liquid crystal

Enhanced Deformation of Azobenzene-Modified Liquid Crystal

out by measuring the photonic crystal diffraction wavelength. The active element of the device is an azobenzene cross-linked hydrogel which contains an embedded crystalline colloidal array. UV excitation forms cis-azobenzene cross-links while visible excitation forms trans-azobenzene cross-links. The les The nonlinear photomechanics and thermodynamics of azobenzene liquid crystal polymer networks is studied to quantify interactions between wavelength dependent molecular conformation changes that occur within a polymer network. The transfer of energy from light to liquid crystals to a polymer network strongly depends on the wavelength and. and wavelength shi . e nanolms were deposited on the surface of interior air channels in the cladding of the PCF-LPG. e authors suggested that the interior nanolm-coated PCF-LPGs have a large resonance wavelength shi of .%/pm within the RH region from % to %. Previous research suggests that azobenzene-based polymer

Driving a single microtubule with light (w/video)

Rationally designed azobenzene photoswitches for efficient

A novel azobenzene derivative that has a large ground-state activation barrier between the cis and trans forms in water is used. The system is actuated by excitation with UV light (wavelength of 365 nm), which photoisomerizes the azobenzene trans state to the cis ground state If the azobenzene groups have no electron-donor- electron-acceptor substituents or no amino substituents, the thermal cis-trans isomerization is relatively No electron-donor-electron-acceptor substituents also means that the maximum absorbance will be shifted toward higher energy (shorter wavelength) for the trans isomer Azobenzene polymer can be infiltrated into the SiO 2 inverse opal film by heating to melt. The pore diameter and volume fraction of SiO 2 inverse opal, d and f, were estimated by comparing wavelength of the reflection peaks of the SiO 2 inverse opal films infiltrated with various solvents with different refractive indices

Azobenzene 96% 103-33-

20 August 2009 Azobenzene liquid crystals for fast reversible optical switching and enhanced sensitivity for visible wavelengths Uladzimir Hrozhyk , Svetlana Serak , Nelson Tabiryan , Diane M. Steeves , Landa Hoke , Brian R. Kimbal Computational investigation on the ground state properties of trans-azobenzene and four kinds of hydroxy-ended azobenzene-type chromophores containing different substituent groups as electron donor and acceptor in different solvent media was carried out. The effects ofsubstituents -I 2 , -OH- and -CH 3 , -NH 2 , and -Cl<sub>2</sub> on the electronic properties like the E<sub>HOMO</sub>, E.

(PDF) Femtosecond time-resolved UV-visible absorption

BibTeX @MISC{Huang_articleoptothermal, author = {Tai-chieh Huang and Yen-yu Chen and Chih-chien Chu and Vincent K. S. Hsiao}, title = {Article Optothermal Switching of Cholesteric Liquid Crystals: A Study of Azobenzene Derivatives and Laser Wavelengths}, year = {} Using azobenzene LC with a fast response time, we achieved tuning speeds on the range of milliseconds for CW laser pumping. References A voltage-tuned resonant reflectance optical filter for visible wavelengths fabricated by nanoreplica molding, F. Yang, G. Yen, and B.T. Cunningham, Applied Physics Letters, Vol. 90, p. 261109-261111, 2007 Azobenzene derivatives act as both impellers and gatekeepers when they are tethered in and on mesoporous silica nanoparticles. Continuous excitation at 457 nm, a wavelength where both the cis and trans conformers absorb, produces constant isomerization reactions and results in continual dynamic wagging of the untethered terminus. The 2 nm.

A photoresponsive glycosidase mimic - ChemicalH2 dissociation induced by hot electrons [11]

Communication: Time-resolved fluorescence of highly single

Azobenzene immobilized on the photonic crystal surface will experience a significantly increased light intensity compared to non-resonant surfaces. We performed finite-difference time-domain (FDTD) calculations for determination of resonance positions and electric field strengths in compound grating structures Shining an ultraviolet lamp (at a wavelength of 365 nanonometers) on the liquid mixture changed most of the starting trans azobenzene molecules to their cis form. Once it was charged, the mixture didn't solidify even at room temperature — fully 10 Celsius below where it would have without the charged photoswitches in the mix cal molecule called azobenzene. In the case of tetra-tert-butyl-functionalized azobenzene (TTB-AB) molecules adsorbed on Au(111) reversible switching by means of ultraviolet and visible excitation is experimen-tally observed at the single-molecule level. The presence of the metallic surface leads t The red light hologram recording is based on cis-to-trans transition of the azobenzene and surrounding LC reorientation. The diffraction efficiency of about 2% has been achieved and clear holograms of a commercial 2D USAF resolution target have been recorded fused azobenzene-boron complex 4, reported as a photoluminescent molecule by Tanaka and Chujo's group (Fig. 1B) (22). Compound 4 has a small molecular weight of 242 but has a relatively long maxi-mum absorption wavelength of 479 nm. Density functional theory (DFT) calculations indicated that the most stable structure of 4 i

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