2017
The absorption spectrum of cis-azobenzene
VETRÁKOVÁ, Ľubica, Vít LADÁNYI, Jamaludin AL ANSHORI, Pavel DVOŘÁK, Jakob WIRZ et. al.Základní údaje
Originální název
The absorption spectrum of cis-azobenzene
Autoři
VETRÁKOVÁ, Ľubica (703 Slovensko, domácí), Vít LADÁNYI (203 Česká republika, domácí), Jamaludin AL ANSHORI (360 Indonésie, domácí), Pavel DVOŘÁK (203 Česká republika, domácí), Jakob WIRZ (756 Švýcarsko) a Dominik HEGER (203 Česká republika, garant, domácí)
Vydání
PHOTOCHEMICAL AND PHOTOBIOLOGICAL SCIENCES, CAMBRIDGE, ROYAL SOC CHEMISTRY, 2017, 1474-905X
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10403 Physical chemistry
Stát vydavatele
Velká Británie a Severní Irsko
Utajení
není předmětem státního či obchodního tajemství
Impakt faktor
Impact factor: 2.902
Kód RIV
RIV/00216224:14310/17:00095381
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000417283600002
Klíčová slova anglicky
Azobenzene; spectra; molar absorption coefficients; photoisomerization
Příznaky
Mezinárodní význam, Recenzováno
Změněno: 12. 4. 2018 12:08, Ing. Nicole Zrilić
Anotace
V originále
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.
Návaznosti
GA15-12386S, projekt VaV |
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LM2015051, projekt VaV |
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LO1214, projekt VaV |
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