VETRÁKOVÁ, Ľubica, Vít LADÁNYI, Jamaludin AL ANSHORI, Pavel DVOŘÁK, Jakob WIRZ and Dominik HEGER. The absorption spectrum of cis-azobenzene. PHOTOCHEMICAL AND PHOTOBIOLOGICAL SCIENCES. CAMBRIDGE: ROYAL SOC CHEMISTRY, 2017, vol. 16, No 12, p. 1749-1756. ISSN 1474-905X. Available from: https://dx.doi.org/10.1039/c7pp00314e. |
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@article{1403006, author = {Vetráková, Ľubica and Ladányi, Vít and Al Anshori, Jamaludin and Dvořák, Pavel and Wirz, Jakob and Heger, Dominik}, article_location = {CAMBRIDGE}, article_number = {12}, doi = {http://dx.doi.org/10.1039/c7pp00314e}, keywords = {Azobenzene; spectra; molar absorption coefficients; photoisomerization}, language = {eng}, issn = {1474-905X}, journal = {PHOTOCHEMICAL AND PHOTOBIOLOGICAL SCIENCES}, title = {The absorption spectrum of cis-azobenzene}, url = {http://pubs.rsc.org/en/content/articlelanding/2017/pp/c7pp00314e#!divAbstract}, volume = {16}, year = {2017} }
TY - JOUR ID - 1403006 AU - Vetráková, Ľubica - Ladányi, Vít - Al Anshori, Jamaludin - Dvořák, Pavel - Wirz, Jakob - Heger, Dominik PY - 2017 TI - The absorption spectrum of cis-azobenzene JF - PHOTOCHEMICAL AND PHOTOBIOLOGICAL SCIENCES VL - 16 IS - 12 SP - 1749-1756 EP - 1749-1756 PB - ROYAL SOC CHEMISTRY SN - 1474905X KW - Azobenzene KW - spectra KW - molar absorption coefficients KW - photoisomerization UR - http://pubs.rsc.org/en/content/articlelanding/2017/pp/c7pp00314e#!divAbstract L2 - http://pubs.rsc.org/en/content/articlelanding/2017/pp/c7pp00314e#!divAbstract N2 - Azobenzene is a prototypical photochromic molecule existing in two isomeric forms, which has numerous photochemical applications that rely on a precise knowledge of the molar absorption coefficients (e). Careful analysis revealed that the previously reported absorption spectra of the "pure" isomers were in fact mutually contaminated by small amounts of the other isomer. Therefore, the absorption spectra of both trans- and cis-azobenzene in methanol were re-determined at temperatures of 5-45 degrees C. The thermodynamically more stable trans-azobenzene was prepared by warming the solution in the dark. To obtain the spectrum of cis-azobenzene three methods were used, which gave consistent results within the limits of error. The method based on the subtraction of derivative spectra coupled with a global analysis of the spectra recorded during thermal cis-trans isomerization is shown to give slightly more reliable results than the method using isomeric ratios determined by 1H-NMR. The described methods are readily generalizable to other azobenzene derivatives and to other photochromic systems. The practical implication of the re-determined e values is demonstrated by a very high precision of spectrophotometric species analysis in azobenzene isomeric mixtures. The new e values imply that the previously reported quantum yields must be revised. ER -
VETRÁKOVÁ, Ľubica, Vít LADÁNYI, Jamaludin AL ANSHORI, Pavel DVOŘÁK, Jakob WIRZ and Dominik HEGER. The absorption spectrum of cis-azobenzene. \textit{PHOTOCHEMICAL AND PHOTOBIOLOGICAL SCIENCES}. CAMBRIDGE: ROYAL SOC CHEMISTRY, 2017, vol.~16, No~12, p.~1749-1756. ISSN~1474-905X. Available from: https://dx.doi.org/10.1039/c7pp00314e.
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