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Coordination compounds of some nickel (II) salts derived from 1,3-bis(di-n-propyl-phosphinyl)guanidine (DPPG) have been synthesized and characterized from their chemical analyses, infrared spectra, electronic spectra, conductance and magnetic moment measurements. With nickel perchlorate, an octahedral complex of the type [Ni(DPPG) 2 ](ClO 4 ) 2  has been prepared, while with corresponding chloride and iodide square planar compounds of the type [Ni(DPPG)X]X have been obtained. With nickel sulfate a 1:1 diamagnetic complex is formed in which sulfate ion is unidentately bound. In all the complexes DPPG acts as a tridentate ligand and bonding takes place from two P = O groups and the imino nitrogen atom. The solvation behavior of the complexes has also been studied.

Coordination Chemisty of Phosphoguanidines, I: Nickel(II) Complexes of 1,3-Bis(di-N-propyl-phosphinyl)-guanidine