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Infrared and Raman spectra of (η 6 ‐mesitylene)M(CO) 3 complexes (MCr, Mo or W): An insight into metal–arene bonding
Author(s) -
Armstrong R S,
Aroney M J,
Barnes C M,
Nugent K W
Publication year - 1990
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.590040519
Subject(s) - mesitylene , chemistry , raman spectroscopy , molybdenum , molecule , infrared , infrared spectroscopy , tungsten , metal , crystallography , chromium , inorganic chemistry , benzene , organic chemistry , physics , optics
Infrared and Raman spectra of mesitylene complexes of chromium, molybdenum and tungsten tricarbonyls have been studied. Bands have been assigned and intesities calculated for a number of important modes. The intensities are related to the polarities and polarizabilities of individual bonds within the molecules. Variations of bond properties with change of metal M in the (η 6 ‐mesitylene)M(CO) 3 complexes have been examined. The results are interpreted in terms of the relative importance of π‐donation from the arene to the metal and of δ‐backbonding. A molecular orbital scheme is proposed which accounts for the changes observed in the degree of π‐and δ‐bonding within the group of complexes studied.