Abstract
The compound melting at 138� and for long
supposed to be anhydrous bis(acetylacetonato)zinc(II) is shown to be the
monohydrate. The anhydrous compound has also been obtained, melting at 152�;
and adducts are described with one and two molecules of pyridine or
4-methylpyridine, one molecule of 2-methylpyridine, and two molecules of
ammonia. Molecular weight determinations in benzene and triphenylmethane show
that with the exception of the anhydrous compound which is monomeric, the
predominant species in solution are five-coordinate. Differences in the
stereochemical behaviour of zinc in these compounds from the behaviour of
cobalt(II) and nickel(II) in corresponding compounds are interpreted in terms
of crystal-field stabilization of octahedral complexes of the latter ions.
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