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Synthesis and Characterization of Cobalt(II), Nickel(II) and Copper(II) Chloride Complexes with Bis[(diphenylphosphinyl)methyl]phenylphosphine Oxide and Bis[(diphenylphosphinyl)methyl]phosphinic Acid

A series of cobalt(II), nickel(II) and copper(II) chloride complexes with the tripod organophosphorous compounds: bis[(diphenylphosphinyl)methyl]phenylphosphine oxide (RPPh) and bis[(diphenylphosphinyl)methyl]phosphinic acid (RPOH) were studied. Complexes of the general stoichiometry [M(RPPh)_3][MCl_4] center dot 4H_2O and [M(RPOH)Cl center dot nH_2O]_m (M = Co(II), Ni(II) or Cu(II) ; n = 0-4, m = 1, 2 or more) were isolated. According to the spectral and magnetic data, complexes with the RPPh ligand appear to have both an octahedral and a tetrahedral surrounding of the metal(II) ion. For the complexes [M(RPOH)Cl center dot nH_2O]_m the electronic effects of the metal ion seems to be predominant. A tetrahedral surrounding for the cobalt(II) complex, an octahedral surrounding for the nickel(II) complex and a tetragonal distorted octahedral environment for the copper(II) complex has to be assumed.

cobalt ; nickel ; copper ; complexes ; tripod organophosphorus ligands ; synthesis ; spectroscopic measurements ; magnetic properties

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