期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 119, 期 37, 页码 12318-12324出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.5b05853
关键词
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资金
- DGAPA-UNAM [PAPIIT IN100513]
- NSERC of Canada
Two novel azo-dyes bearing an end-capped oligo(ethylene glycol) chain were synthesized and then studied by UV-visible and NMR. spectroscopy. For both azobenzenes, the end-capped oligo(ethylene glycol) segment is on the para position of the first phenyl ring. On the second phenyl ring, a methoxy group is added on the para position for one azodye and no substitution group on the other, which made them electronically a push push and a push system, respectively. The presence of the methoxy group changes significantly the absorption and the photoisomerization behaviors and results in a much less intense absorbance for the trans isomer and a shift from 350 to 360 nm. In the kinetic studies the azobenzene bearing a methoxy group shows a zero-order and a first-order kinetics as a function of the time scale of the study as well as an aggregation phenomenon. This azo-dye in different solvents has been studied by H-1 NMR and pulsed gradient NMR experiments to understand the effects of the photoisomerization and the aggregation on the self-diffusion of these molecules in solutions.
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