Multiply Bonded Oxo, Imido and Nitrido Complexes of Rhenium(V)
Transition metals (M), especially those around the vanadium and chromium Groups in the Peridic Table have a strong tendency to form oxycations of the type MOn+ in which one oxygen atom is strongly bonded to the metal and remarkably resistant to protonation. This behaviour is to be associated with strong πr -bonding between the metal and the oxygen, so that the M-O bond has considerable triple bond character (M ≡ O) (1, 2). The oxygen atom thus resembles that of carbon monoxide rather than that of the ketones, and should carry considerably less negative charge than would a truly doubly bonded oxygen (M =O).
KeywordsDipole Moment High Dipole Moment Imperial Chemical Industry Experimental Dipole Moment Chromium Group
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