The absorption spectrum of cis-azobenzene
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F17%3A00095381" target="_blank" >RIV/00216224:14310/17:00095381 - isvavai.cz</a>
Result on the web
<a href="http://pubs.rsc.org/en/content/articlelanding/2017/pp/c7pp00314e#!divAbstract" target="_blank" >http://pubs.rsc.org/en/content/articlelanding/2017/pp/c7pp00314e#!divAbstract</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/c7pp00314e" target="_blank" >10.1039/c7pp00314e</a>
Alternative languages
Result language
angličtina
Original language name
The absorption spectrum of cis-azobenzene
Original language description
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.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10403 - Physical chemistry
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
PHOTOCHEMICAL AND PHOTOBIOLOGICAL SCIENCES
ISSN
1474-905X
e-ISSN
—
Volume of the periodical
16
Issue of the periodical within the volume
12
Country of publishing house
GB - UNITED KINGDOM
Number of pages
8
Pages from-to
1749-1756
UT code for WoS article
000417283600002
EID of the result in the Scopus database
—