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Resonance Raman studies of the structures and vibrational assignments of photochromic S ‐alkyldithizones
Author(s) -
Takahashi Hiroaki,
Yamada Osamu,
Isaka Hiroaki,
Igarashi Takashi,
Kaneko Norio
Publication year - 1988
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250190503
Subject(s) - raman spectroscopy , chemistry , resonance (particle physics) , cis–trans isomerism , photochromism , solid state , crystal (programming language) , photochemistry , crystallography , stereochemistry , atomic physics , optics , physics , computer science , programming language
The resonance Raman spectra of S ‐methyldithizone (MeHDz), S ‐ethyldithizone (EtHDz) and S ‐isopropyldithizone (iPrHDz) have been measured in the solid state and in solution. It is shown that the red and yellow isomers of these S ‐alkyldithizones adopt in solution the trans‐syn‐s‐trans and trans‐anti‐s‐trans configurations, respectively, with respect to the NN, CN and CN bonds of the formazan skeleton. It is also demonstrated that for EtHDz the red and yellow isomers can be isolated as different crystal forms. Vibrational assignments are given for both red and yellow isomers of MeHDz based on the frequency shifts of five kinds of isotopically substituted species.