الفهرس 
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Abstract
Often metal complexes eJ~and their coordination number by interaction with a lewis base, This may take place by inte~molecular association(l) or by adduct formation(2-4) with solvent o~ other ava~lable ligands. T~e p~sioa~ p~o-perties of tne resulting oomplex of significantly different from those of the complex: not having the eJq)aoded coordinat~on number. The expansion of the coordination sphere will be clarified in the .tol~owing discussion. f-Di~etones and re~ated oompounds capable of exhibiting keto-enol tautomerism (i. ii) reaot with metal cation to form oomplexes, in which the metal replaces tqe enolic hYdrogen and a si~-membered chelate ring is produced.