Alkali metal and ammonium difluoromono(isonicotinoylhydrazinato)cuprate(II) trihydrate

Alkali metal and ammonium difluoromono(isonicotinoylhydrazinato)cup trihydr ates, MECuF2(pyinhH)1.3H(2)O (where M = Li, Na, K, Rb and NH4; pyinhH(2) = isonicotinoylhydrazine), have been synthesized and characterized. The compl exes have anomalously low mu(eff) values suggesting weak Cu-Cu interaction. ESR evidence suggests that all complexes have weakly interacting electrons in the d(x2-y2) orbital. IR data suggest bonding of mononegative isonicoti noylhdrazine through the enolate oxygen atom and primary nitrogen atom, and terminal and bridging fluoride groups. All complexes are suggested to have square-pyramidal stereochemistry.