Photochemistry and photophysics of copolymers of (−)menthyl acrylate with 4-hydroxystilbene acrylate

Altomare, Angelina; Carlini, Carlo; Ciardelli, Francesco; Solaro, Roberto; Houben, Julien L.; Rosato, Nicola

doi:10.1016/0032-3861(83)90088-5

Cited by 39 publications

(31 citation statements)

References 20 publications

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“…[14,17] Rate constants for the trans → cis and cis → trans isomerization of MPABA were found to be 7.59 × 10 -4 and 14.68 × 10 -4 s -1 , respectively, which is quite comparable with other literature values. [18] …”

Section: Synthesis and Photoisomerization Properties Of The Functionasupporting

confidence: 79%

“…These spectral changes are quite similar to those observed in other azobenzene systems, and can be attributed to the trans → cis isomerization of the azobenzene chromophore. [17] Complete isomerization was achieved in 110 min using the excitation beam of a spectrofluorometer for the irradiation. Irradiating the thermodynamically less stable cis-MPABA at 440 nm restored the original spectrum (Fig.…”

Section: Synthesis and Photoisomerization Properties Of The Functionamentioning

confidence: 99%

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The Fabrication of a Photoresponsive Molecularly Imprinted Polymer for the Photoregulated Uptake and Release of Caffeine

2006

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Section: Synthesis and Photoisomerization Properties Of The Functionasupporting

confidence: 79%

Section: Synthesis and Photoisomerization Properties Of The Functionamentioning

confidence: 99%

The Fabrication of a Photoresponsive Molecularly Imprinted Polymer for the Photoregulated Uptake and Release of Caffeine

2006

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“…Taking into account that the evaluated photoisomerization rate constants linearly depend on the light intensity (I 405 ) at the irradiation wavelength [j = 2.303 I 405 (e cis N U cis + e trans N U trans )] 19) , the experimental values of kinetic constants (j) were averaged over 4 -6 experiments and corrected (j) for the variation of I 405 , as measured by a photodiode.…”

Section: Photochromic Behaviormentioning

confidence: 99%

Methacrylic polymers containing permanent dipole azobenzene chromophores spaced from the main chain.13C NMR spectra and photochromic properties

Altomare

Andruzzi

Ciardelli³

et al. 1999

Macromol. Chem. Phys.

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SUMMARY: Dynamics in solution and photochromic properties of radical copolymers of 4-(4-oxy-49-cyanoazobenzene)but-1-yl methacrylate, 6-(4-oxy-49-cyanoazobenzene)hex-1-yl methacrylate, and 8-(4-oxy-49-cyanoazobenzene)oct-1-yl methacrylate with (-)-menthyl methacrylate were investigated. 13C NMR and 2D HETCOR spectroscopy allowed assignment of 13 C NMR signals and evaluation of main chain tacticity. 13C T 1 relaxation times evidenced a rather limited mobility of the azobenzene chromophores when inserted in polymer macromolecules. Mobility increased with increasing the length of the polymethylene spacer that acted as a flexible joint between the aromatic chromophore and polymer backbone. Both the trans to cis photoisomerization and the cis to trans thermal isomerization processes showed a small dependence on monomer structure and chemical composition of the investigated photochromic polymers. These data seem to suggest an appreciable contribution of the in-plane inversion mechanism to both isomerization processes of the azobenzene chromophores. The absence of appreciable dichroic bands in the copolymer CD spectra and the negative results obtained in preliminary second harmonic generation measurements are discussed in terms of the polymer structural features.

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“…This indicates that the macromolecular structure has little influence on the photoisomerization process, analogously to what observed for several azobenzene containing polymers. 4 • 5 · 18 When kept in the dark copolymer samples mainly containing cis-azobenzene moieties undergo thermal cis to trans back-isomerization. The isomerization rates heavily depend on the purity of the chloroform used as solvent.…”

Section: Reversible Trans-cis Isomerizationmentioning

confidence: 99%

Optically Active Polymers Containing Side Chain Azobenzene Chromophores: Chiroptical Properties and Photochromic Behaviour of 4-Methacryloxyazobenzene/(−)-Menthyl Methacrylate Copolymers

Altomare

Carlini

Ciardelli

et al. 1988

Polym J

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ABSTRACT:Copolymers of trans-4-methacryloxyazobenzene (MAB) with ( -)-menthyl methacrylate (MtMA) have been prepared by using AIBN as free radical initiator. The resulting polymer samples are characterized by a substantially random distribution of monomeric co-units, as evaluated from reactivity ratios. Kinetics of photoinduced trans to cis and thermally induced cis to trans back-isomerization of azobenzene side chains have been examined and the relevant kinetic parameters evaluated. Dependence of chiroptical properties on both copolymer composition and extent of cis/trans isomerization has been investigated. The circular dichroism induced on azobenzene chromophores has been shown to arise mainly from isolated MAB units, as the chiral perturbation is not appreciably transmitted along MAB sequences. The results have been discussed in terms of tertiary structure reversible variations connected to photoinduced change of local conformation.

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Photochemistry and photophysics of copolymers of (−)menthyl acrylate with 4-hydroxystilbene acrylate

Cited by 39 publications

References 20 publications

The Fabrication of a Photoresponsive Molecularly Imprinted Polymer for the Photoregulated Uptake and Release of Caffeine

The Fabrication of a Photoresponsive Molecularly Imprinted Polymer for the Photoregulated Uptake and Release of Caffeine

Methacrylic polymers containing permanent dipole azobenzene chromophores spaced from the main chain.13C NMR spectra and photochromic properties

Optically Active Polymers Containing Side Chain Azobenzene Chromophores: Chiroptical Properties and Photochromic Behaviour of 4-Methacryloxyazobenzene/(−)-Menthyl Methacrylate Copolymers

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