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Photoisomerism

Seidner L, Stock G and Domcke W 1995 Nonperturbative approach to femtosecond spectroscopy - general theory and application to multidimensional nonadiabatic photoisomerization processes J. Chem. Phys. 103 4002... [Pg.280]

According to Kramers model, for flat barrier tops associated with predominantly small barriers, the transition from the low- to the high-damping regime is expected to occur in low-density fluids. This expectation is home out by an extensively studied model reaction, the photoisomerization of tran.s-stilbene and similar compounds [70, 71] involving a small energy barrier in the first excited singlet state whose decay after photoexcitation is directly related to the rate coefficient of tran.s-c/.s-photoisomerization and can be conveniently measured by ultrafast laser spectroscopic teclmiques. [Pg.820]

Figure A3.6.5. Photoisomerization rate constant of (ran.s -stilbene m n-pentane versus inverse of the self-diflfrision coefficient. Points represent experimental data, the dashed curve is a model calculation based on an... Figure A3.6.5. Photoisomerization rate constant of (ran.s -stilbene m n-pentane versus inverse of the self-diflfrision coefficient. Points represent experimental data, the dashed curve is a model calculation based on an...
Figure A3.6.8. Isothemis of k ) for tran.s-stilbene photoisomerization in n-hexane at temperatures between... Figure A3.6.8. Isothemis of k ) for tran.s-stilbene photoisomerization in n-hexane at temperatures between...
Figure A3.6.9. Viscosity dependence of photoisomerization rate constants of tran.s -stilbene (open circles) and E,E-diphenylbutadiene (fiill circles) in n-butanol. The broken line indicates a -dependence of k [96],... Figure A3.6.9. Viscosity dependence of photoisomerization rate constants of tran.s -stilbene (open circles) and E,E-diphenylbutadiene (fiill circles) in n-butanol. The broken line indicates a -dependence of k [96],...
Schroeder J, Tree J and Vdhringer P 1995 Photoisomerization of f/ a/rs-stilbene in compressed solvents Kramers turnover and solvent induced barrier shift Z. Phys. Chem. 188 287... [Pg.865]

Gehrke C, Schroeder J, Schwarzer D, Tree J and Voss F 1990 Photoisomerization of diphenylbutadiene in low-... [Pg.865]

Syage J A, Felker P M and Zewail A H 1984 Picosecond dynamics and photoisomerization of stilbene in supersonic beams. I. Spectra and mode assignments J. Chem. Phys. 81 4685-705... [Pg.866]

Nordhoim S 1989 Photoisomerization of stiibene—a theoreticai study of deuteration shifts and iimited internai vibrationai redistribution Chem. Phys. 137 109-20... [Pg.867]

Rothenberger G, Negus D K and Hochstrasser R M 1983 Solvent influence on photoisomerization dynamics J. Chem. Phys. 79 5360-7... [Pg.867]

Sundstrdm V and Gillbro T 1985 Dynamics of trans-cis photoisomerization of stiibene in hydrocarbon solutions Ber. Bunsenges Phys. Chem. 89 222-6... [Pg.867]

Park N S and Waldeck D FI 1989 Implications for multidimensional effects on isomerization dynamics photoisomerization study of 4,4 -dimethylstilbene in / -alkane solvents J. Chem. Phys. 91 943-52... [Pg.867]

Nikowa L, Schwarzer D, Troe J and Schroeder J 1992 Viscosity and solvent dependence of low barrier processes photoisomerization of c/s-stilbene in compressed liquid solvents J. Chem. Phys. 97 4827... [Pg.867]

Gehrke C, Mohrschladt R, Schroeder J, Troe J and Vdhringer P 1991 Photoisomerization dynamics of diphenylbutadiene in compressed liquid alkanes and in solid environment Chem. Phys. 152 45... [Pg.867]

Sun Y-P and Saltiel J 1989 Application of the Kramers equation to stiibene photoisomerization in / -alkanes using translational diffusion coefficients to define microviscosity J. Phys. Chem. 93 8310-16... [Pg.867]

Schroeder J, Schwarzer D, Troe J and Vbhringer P 1994 From barrier orossing to barrieriess reiaxation dynamios photoisomerization of f/ ans-stiibene in oompressed aikanois Chem. Phys. Lett. 218 43... [Pg.868]

Poliak E 1987 Transition state theory for photoisomerization rates of f/ a/rs-stilbene in the gas and liquid phases J. Chem. Phys. 86 3944... [Pg.897]

Many of the fiindamental physical and chemical processes at surfaces and interfaces occur on extremely fast time scales. For example, atomic and molecular motions take place on time scales as short as 100 fs, while surface electronic states may have lifetimes as short as 10 fs. With the dramatic recent advances in laser tecluiology, however, such time scales have become increasingly accessible. Surface nonlinear optics provides an attractive approach to capture such events directly in the time domain. Some examples of application of the method include probing the dynamics of melting on the time scale of phonon vibrations [82], photoisomerization of molecules [88], molecular dynamics of adsorbates [89, 90], interfacial solvent dynamics [91], transient band-flattening in semiconductors [92] and laser-induced desorption [93]. A review article discussing such time-resolved studies in metals can be found in... [Pg.1296]

Nishiyama Kand Fujihira M 1988 Cis-trans reversible photoisomerization of an amphiphilio azobenzene derivative in its pure LB film prepared as polyion oomplexes with polyallylamine Chem. Lett. 1257-60... [Pg.2632]

Nakahara H, Fukuda K, Shimomura M and Kunitake T 1988 Moleoular arrangements and photoisomerization of amphiphilio azobenzene derivatives in monolayers and multilayers Mppo/ Kagaku Ka/sh/1001-10... [Pg.2632]

The easiest method for creating many vibrational excitations is to use convenient pulsed visible or near-UV lasers to pump electronic transitions of molecules which undergo fast nonradiative processes such as internal conversion (e.g. porjDhyrin [64, 65] or near-IR dyes [66, 62, 68 and 62]), photoisomerization (e.g. stilbene [12] or photodissociation (e.g. Hgl2 [8]). Creating a specific vibrational excitation D in a controlled way requires more finesse. The easiest method is to use visible or near-UV pulses to resonantly pump a vibronic transition (e.g. [Pg.3038]

The vibronic coupling model has been applied to a number of molecular systems, and used to evaluate the behavior of wavepackets over coupled surfaces [191]. Recent examples are the radical cation of allene [192,193], and benzene [194] (for further examples see references cited therein). It has also been used to explain the lack of structure in the S2 band of the pyrazine absoiption spectrum [109,173,174,195], and recently to study the photoisomerization of retina] [196],... [Pg.288]

The first study in which a full CASSCE treatment was used for the non-adiabatic dynamics of a polyatomic system was a study on a model of the retinal chromophore [86]. The cis-trans photoisomerization of retinal is the primary event in vision, but despite much study the mechanism for this process is still unclear. The minimal model for retinal is l-cis-CjH NHj, which had been studied in an earlier quantum chemisti7 study [230]. There, it had been established that a conical intersection exists between the Si and So states with the cis-trans defining torsion angle at approximately a = 80° (cis is at 0°). Two... [Pg.305]

THE cvcLOBUTADENE-TETRAHEDRANE SYSTEM. A related reaction is the photoisomerization of cyclobutadiene (CBD). It was found that unsubstituted CBD does not react in an argon matrix upon irradiation, while the tri-butyl substituted derivative forms the corresponding tetrahedrane [86,87]. These results may be understood on the basis of a conical intersection enclosed by the loop shown in Figure 37. The analogy with the butadiene loop (Fig. 13) is obvious. The two CBDs and the biradical shown in the figure are the three anchors in this system. With small substituents, the two lobes containing the lone electrons can be far... [Pg.370]

In 1969 Lablache-Combi er et al. (110) found that in the presence of primary amines isothiazole photoisomerizes to thiazoie (Scheme 100). [Pg.136]


See other pages where Photoisomerism is mentioned: [Pg.419]    [Pg.739]    [Pg.820]    [Pg.820]    [Pg.853]    [Pg.854]    [Pg.854]    [Pg.855]    [Pg.866]    [Pg.2407]    [Pg.3033]    [Pg.310]    [Pg.376]    [Pg.136]    [Pg.137]   
See also in sourсe #XX -- [ Pg.236 ]




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0-Ionone. photoisomerization

1 - Aza-1 -oxa-di-ir-methane rearrangements photoisomerizations

1,2-Diarylethylenes photoisomerization

1- Acylindoles, photoisomerization

1.3- dienes photoisomerization

1.3.6- Cyclononatriene via photoisomerization

1.4- Cyclohexadiene photoisomerization

1.4- Pentadien-3-ol, 1,1,3,5,5-pentaphenylphenyldimethylsilyl ethers photoisomerization

1.6- Diketones photoisomerizations

2- pyrazine photoisomerization

3,y-Enones photoisomerizations

Alkenes photoisomerization

Allodolicholactone via photoisomerizations

Asymmetric photoisomerization

Azo compounds, imines and oximes E Z photoisomerization

Azobenzene photoisomerization

Azobenzene polymers photoisomerization

Azobenzenes photoisomerization

Azobenzenes structure, photoisomerization

Azobenzenes, photoisomerism

Bacteriorhodopsin photoisomerization

Barrelene photoisomerization

Benzene photoisomerization

Benzene photoisomerizations

Benzisothiazole, photoisomerization

Benzo systems photoisomerization

Benzonorbomadiene, 1,2-bis photoisomerization

Benzonorbomadiene, 6-methoxybridgehead-substituted photoisomerization

Benzonorcaradiene via photoisomerization

Bicyclo hept-3-enes photoisomerization

Bicyclo nona-2,8-diene via photoisomerization

Bicyclo oct-5-en-2-one photoisomerizations

Bicyclo octanedione via photoisomerization

Bicyclo[4.1 .Ojalkenes via photoisomerization

Boschnialactone via photoisomerizations

Carbamycin via photoisomerization

Cedranoids via photoisomerization

Cedrol via photoisomerizations

Charge photoisomerization

Chromophores photoisomerization

Cis photoisomerization

Conical intersection photoisomerization

Coriolin via photoisomerization

Crystal Structures During Photoisomerization

Cumulative Subject photoisomerizations

Cyclobutanes, vinylrearrangements via photoisomerization

Cyclodextrins photoisomerization

Cyclohexadiene-hexatriene photoisomerization

Cyclohexene photoisomerization

Cyclooctatetraene via photoisomerization

Cyclooctene photoisomerization

Cyclopentanoids synthesis via photoisomerizations

Dendrimers photoisomerization

Diazirines photoisomerization

Dienes photoisomerizations

Dimethylamino photoisomerization

Diquinanes via photoisomerizations

Direct photoisomerization

Donor photoisomerization

Double photoisomerization

E-Z photoisomerization of azobenzenes

E/Z photoisomerization

EZ-Photoisomerization

Electron photoisomerization

Enantiodifferentiating photoisomerization

Enantiodifferentiating photoisomerization of cyclooctenes

Enzyme monolayer photoisomerization

Enzyme photoisomerization

Excited State Photoisomerization Paths

Experimental Data on Photoisomerization

Experimental and Theoretical Studies of the Photoisomerization Mechanisms

Ferrocene photoisomerization

Fluorescence photoisomerization

Fluorescence, and Photoisomerization

Forsythide synthesis via photoisomerization

Gated Photoisomerization

Group 10 photoisomerization reactions

Homobarrelene photoisomerization

Hydrocarbons photoisomerization

Imines photoisomerization

Indane, 1-phenylsynthesis via photoisomerization

Indene, 2-vinylsynthesis via photoisomerization

Iridomyrmecin via photoisomerizations

Isoiridomyrmecin via photoisomerizations

Isomerization photoisomerization

Isothiazole-thiazole photoisomerization

Isoxazoles isoxazole—oxazole photoisomerization

Ketones photoisomerization

Ketones photoisomerizations

Macrocyclic photoisomerizations

Mechanisms of Photoisomerization

Modhephene via photoisomerization

Molecular photoisomerization

Molecular systems photoisomerization

Monolayer photoisomerization

Nitrostilbenes photoisomerization

Olefinic photoisomerization

Olefins photoisomerization

Other photoisomerizations

Oxazoles photoisomerization

Oxiranes, vinylcyclic via photoisomerization

P/y-Enones photoisomerizations

Pentalenolactone via photoisomerization

Pentenes photoisomerization

Phosphorescence photoisomerization

Photo-orientation by photoisomerization

Photochemical reactions alkene photoisomerization

Photochemistry photoisomerization

Photoisomerism, cis-trans

Photoisomerization

Photoisomerization

Photoisomerization Reactions of Aromatic Compounds

Photoisomerization and Related Processes

Photoisomerization biocatalyst

Photoisomerization cofactor

Photoisomerization components

Photoisomerization continued

Photoisomerization continued interfaces

Photoisomerization continued mechanism

Photoisomerization continued stilbenes

Photoisomerization continued structure

Photoisomerization cyclooctadiene

Photoisomerization derivatives

Photoisomerization dinitromerocyanine

Photoisomerization dinitrospiropyran

Photoisomerization dynamics, time-resolved

Photoisomerization geometrical

Photoisomerization heterocyclics, 5-membered

Photoisomerization hula-twist process

Photoisomerization in Solutions

Photoisomerization in Visual Rhodopsins

Photoisomerization in polymers

Photoisomerization inhibitor

Photoisomerization interfaces

Photoisomerization isothiazoles

Photoisomerization mechanical components

Photoisomerization mechanism

Photoisomerization monolayers

Photoisomerization nitromerocyanine

Photoisomerization nitrospiropyran

Photoisomerization norbomadiene

Photoisomerization of 1,3-Butadiene

Photoisomerization of 2-Cyanoethyl Group

Photoisomerization of Alkyl Groups in Cobaloxime Complexes

Photoisomerization of Azo-SAMs

Photoisomerization of Coordinated Diazene

Photoisomerization of Cyclic Phosphinic Esters

Photoisomerization of [

Photoisomerization of allylic

Photoisomerization of azobenzene molecule

Photoisomerization of azobenzene residue

Photoisomerization of benzene

Photoisomerization of coordinated

Photoisomerization of nitrones

Photoisomerization of norbornadiene

Photoisomerization of retinal

Photoisomerization organic nonlinear optics

Photoisomerization path

Photoisomerization photo-assisted poling

Photoisomerization photo-orientation

Photoisomerization polymers

Photoisomerization potential energy curves

Photoisomerization pressure effects

Photoisomerization process, nonadiabatic

Photoisomerization protonated

Photoisomerization quantum yields, stilbene

Photoisomerization reversible

Photoisomerization review

Photoisomerization solid-state

Photoisomerization state

Photoisomerization stilbenes

Photoisomerization structure

Photoisomerization tetraphenylethylene

Photoisomerization to Benzvalene

Photoisomerization to Dewar benzene

Photoisomerization transduction

Photoisomerization valence

Photoisomerization, picosecond-beam

Photoisomerization, related problems

Photoisomerization, retinal

Photoisomerization, visual pigments

Photoisomerizations

Photoisomerizations 1.3- sigmatropic shift

Photoisomerizations fragmentations

Photoisomerizations photochemical rearrangements

Photoisomerizations, experimental

Photoisomerizations, miscellaneous

Photosubstitution and Photoisomerization

Polar order, photoisomerization-induced

Polarizability Switching by Photoisomerization

Polarizability switching photoisomerization

Polarizability, photoisomerization

Polycyclic photoisomerization

Polyquinanes via photoisomerizations

Potential energy surfaces photoisomerization

Pseudo-stilbenes photoisomerization

Pyridine photoisomerization

Pyrroles photoisomerization

Quantum photoisomerization

Quantum yield photoisomerization

Quenchers photoisomerization

Quenching photoisomerization

Reaction dynamics photoisomerization

Reactions photoisomerization

Reorientation within the trans-cis Photoisomerization

Ruthenium photoisomerization

Second Harmonic In-situ Investigation of Photoisomerization

Semibullvalene via photoisomerization

Sensitized Photoisomerization

Sesquiterpenes via photoisomerizations

Silasemibullvalene via photoisomerization

Silenes photoisomerization

Singlet photoisomerization

Solid matrices photoisomerization

Spin-Non-Conservative Photoisomerization Naphthvalene

Stilbene Photoisomerization in Dendrimers

Stilbene Photoisomerization on Templates

Stilbene, photochemical isomerization photoisomerization

Stilbene, photoisomerization

Study 6.2 Asymmetric synthesis enantiodifferentiating photoisomerization

Subject photoisomerization

Substituted photoisomerization

Sulphones photoisomerization

Tachysterol, photoisomerization

Temperature photoisomerization

Terpenes via photoisomerizations

Tetracycloundecanone synthesis via photoisomerization

Thiazoles photoisomerization

Trans photoisomerization

Trans-Stilbene photoisomerization

Trans-Stilbene photoisomerization concentration effects

Trans-Stilbene photoisomerization pressure effects

Trans-Stilbene photoisomerization temperature effects

Trans-cis photoisomerization

Trans-cis photoisomerization of stilbene

Tricyclo octan-3-one via photoisomerization

Triplet photoisomerization

Twisted photoisomerization

Twisting photoisomerization

Ultrafast dynamics photoisomerization

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