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Distortional Isomerism in Oxomolybdenum Systems; the Evidence Re‐evaluated
Author(s) -
Bashall Alan P.,
Bligh S. W. Annie,
Edwards Andrew J.,
McPartlin Mary,
Gibson Ver C.,
Robinson Oliver B.
Publication year - 1992
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199216071
Subject(s) - chemistry , molecule , crystallography , crystal (programming language) , infrared spectroscopy , infrared , blueshift , crystal structure , stereochemistry , organic chemistry , materials science , physics , optoelectronics , computer science , optics , photoluminescence , programming language
Two blue forms of the oxomolybdenum complex [Mo(O)Cl 2 (PMe 2 Ph) 3 ] exist, and not one blue and one green or even only one blue form! The molecules of the two blue forms can be characterized and are deformation isomers in which the phosphane ligands are clearly differently oriented, and the MoO bonds have different lengths, which lead to stretching frequencies differing by about 12 cm −1 in the IR spectra of the solids. The lack of change in the IR spectrum for the isomer absorbing at ṽ = 943 cm −1 on cocrystallization with [MoCl 3 (PMe 2 Ph) 3 ] suggests that a crystal packing effect cannot explain the presence of two forms.