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Preparation and photochromism of piperidine decatungstate
Author(s) -
Song Yuan,
Huang Qin,
YihTong Gu, YiDong Ku
Publication year - 1990
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19900080209
Subject(s) - chemistry , photochromism , piperidine , photochemistry , aqueous solution , quantum yield , absorption spectroscopy , visible spectrum , absorption (acoustics) , spectral line , crystal (programming language) , analytical chemistry (journal) , stereochemistry , optics , organic chemistry , fluorescence , physics , astronomy , computer science , programming language
A new photochromic compound, piperidine decatungstate (PiPdDT), (C 5 H 10 NH 2 ) 4 W 10 O 32 was prepared; its TG curve, UV and IR spectra were studied. On exposure to UV light, both its crystal and aqueous solution turn blue with absorption spectra appearing at 756 and 720–742 nm. The ESR signal, recorded at 100 K on a frozen solution of PiPdDT in water after exposure to UV light, centered around g = 1.839. The fading rate constant after exposure to UV light, is k = 7.9 × 10 −4 s −1 , and its quantum yield was determined as ϕw(v) = 22.2, which is higher than the values yet reported for polytungstates in literature.
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