Reversible optical storage utilizing photoinduced reorientation of azobenzene derivatives in organized films

Muzikante, I.; Markava, E.; Gustina, Daina; Gerca, L.; Rutkis, Mārtiņš; Fonavs, E.; Stiller, B.; Brehmer, L.

doi:10.1080/00150190108008662

Cited by 4 publications

(7 citation statements)

References 7 publications

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“…Estimated values of the dipole moment of the azobenzene compounds are in the range from 5 to 10 D [5]. It means that interaction between azobenzene molecules occur.…”

Section: Estimation Of the Photoisomerization Kineticsmentioning

confidence: 97%

“…In turn, when one cyclohexane ring is replaced by hydrogen atom, the value of A becomes the smallest and value of τ becomes the longest. The azobenzene derivative 2a was chosen as one of the best for further experiments to investigate the influence of photo-induced changes in optical, electrical and mechanical properties in solid state on the photoisomerization process [2,3,5,6,8].…”

Section: Estimation Of the Photoisomerization Kineticsmentioning

confidence: 99%

“…The dependence of the value of absorbance at maximum in UV spectral region at 360 nm on irradiation time was obtained. The best fit of the experimental points was obtained by simulating with an exponential function [5]:…”

Section: Estimation Of the Photoisomerization Kineticsmentioning

confidence: 99%

“…We have studied trans/cis photoisomerization process of the compounds 2a, 2b, 2d and 2e, in solutions, and in spin-coated host-guest polymer films on irradiation with alternating UV and visible light. We have investigated compounds 2a, 2b, 2d and 2e in monolayers on the air/water interface and have obtained LB film of compound 2a [2,3,5,6].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Investigation of Photoisomerization of Some New Azobenzene Carboxylic Acids

Gustina¹,

Markava²,

Laizane³

et al. 2011

Latvian Journal of Chemistry

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We have synthesized and investigated a number of new type of the azobenzene derivatives containing alkoxycarboxylic group and N-substituted sulfonamide moiety at the opposite end of the molecule. The influence of the end group substituents on the reversible trans/cis photoisomerization process has been investigated. The photoisomerization process of studied azobenzene derivatives dominates both in chloroform solution and in PMMA polymer host-guest films. The values of the densities are reversible on alternate irradiation at absorbance maxima of trans-(450 nm) and cis-isomers (360 nm).The fastest trans/cis photoisomerization process is observed both in solution and the host-guest film of the azobenzene derivative containing two cyclohexyl groups in the N-substituted sulfonamide moiety. This azobenzene derivative is promising for further studies of the photoinduced mechanic properties like surface relief gratings.

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“…Estimated values of the dipole moment of the azobenzene compounds are in the range from 5 to 10 D [5]. It means that interaction between azobenzene molecules occur.…”

Section: Estimation Of the Photoisomerization Kineticsmentioning

confidence: 97%

Section: Estimation Of the Photoisomerization Kineticsmentioning

confidence: 99%

Section: Estimation Of the Photoisomerization Kineticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis and Investigation of Photoisomerization of Some New Azobenzene Carboxylic Acids

Gustina¹,

Markava²,

Laizane³

et al. 2011

Latvian Journal of Chemistry

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“…In each of the states these molecules have different properties owing to the changes of their dipole moment, structure, etc. [3].…”

Section: Introductionmentioning

confidence: 99%

Photoisomerization Processes of Azobenzene Compounds in Thin Poymer Films

Niparte¹,

Muzikante²,

Fonavs³

et al. 2010

Latvian Journal of Physics and Technical Sciences

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One of the most important properties of the molecular switches is turning of a molecule by external action, e.g. by irradiation with light of definite wavelength. The molecules of promise for the molecular switches are those with azobenzene moiety. When azobenzene is irradiated with light of definite wavelength, it is possible to observe the process of trans/cis isomerisation. In this work, the influence of photoisomerisation processes on the changes in the surface potential of a novel azobenzene compound is investigated.We have studied the surface potential of a PMMA polymer film with polar azobenzene derivative of different concentrations. To orient azobenzene molecules in the film the corona poling method was used, and for studying the surface potential variations -the Kelvin probe method. The photoreaction time constant of the fast response (several seconds) was found to be almost independent of the molecular concentration in the polymer film and of the absorbed light intensity in the bulk of a sample. In contrast, the amplitude of photoinduced changes in the surface potential depends both on the concentration of azobenzene molecules and on the absorbed light intensity in bulk of the host-guest polymer film.

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An Evanescent-Field-Driven Self-Assembled Molecular Photoswitch for Macrocycle Coordination and Release

2004

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Two self-assembled monolayer (SAM) films containing the photoswitchable 4-pyridylazophenoxy chromophore have been deposited onto a gold-coated glass substrate. One film contains the chromophore as a single component, 1 SAM, and the other is doped with a nonphotoactive component as a 1:1 mixture, 2 SAM. The reversible photoswitching performances of 1 SAM and 2 SAM via the evanescence field using light of appropriate wavelengths have been investigated by UV spectroscopic and electrochemical monitoring. In principle, the trans-form SAMs present a coordinating surface, the “on” state, that can be switched “off” in the cis form. This has been illustrated by immersing both the as-deposited (trans form) SAMs and the photoswitched (predominantly cis form) SAMs into solutions of cobalt and zinc tetraphenylporphyrin (CoTPP and ZnTPP, respectively) and an octaoctyl-substituted cobalt phthalocyanine. In a further phase of this study, the remote control of binding events at the surface of the SAMs has been demonstrated through evanescent-field-driven photoswitching of trans-form SAMs coordinated at the surfaces with examples of these metallomacrocycles. This photoswitching was undertaken with the constructs immersed in neat toluene, and the macrocycles were released from the surface into the solvent. The release was measured by spectroscopic monitoring of the material remaining on the constructs. The study was extended to develop an in situ release/coordination cycle. Thus, irradiation of a construct of ZnTPP bound to the surface of trans-form 2 SAM using waveguided light at 365 nm releases the macrocycle into a toluene solution of ZnTPP. Further irradiation of the SAM, now in its cis form, with waveguided 439 nm light regenerates the trans form, which recoordinates ZnTPP from the solution. The results demonstrate the potential for using waveguided light to control molecular events within and at the surfaces of SAM constructs

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Reversible optical storage utilizing photoinduced reorientation of azobenzene derivatives in organized films

Cited by 4 publications

References 7 publications

Synthesis and Investigation of Photoisomerization of Some New Azobenzene Carboxylic Acids

Synthesis and Investigation of Photoisomerization of Some New Azobenzene Carboxylic Acids

Photoisomerization Processes of Azobenzene Compounds in Thin Poymer Films

An Evanescent-Field-Driven Self-Assembled Molecular Photoswitch for Macrocycle Coordination and Release

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