Nitrogen-donor base adducts of bis(O,O '-di-isoamyldithiophosphato)nickel(II)

A series of Ni-II complexes with the O,O'-di-isoamylester of dithiophosphor ic acid and nitrogen-donor ligands of composition [Ni(i-Am(2)dtp)(2)(L)]; [ dtp = O2PS2-; L = 2,2'-bipyridine (bpy); 1,10-phenanthroline (phen); 5-nitr o-1,10-phenanthroline (nphen); 4,7-diphenyl-1,10-phenanthroline (baphen); 2 ,9-dimethyl-1,10-phenanthroline (neo), 2-aminomethylpyridine (amp), 2-(2-am inoethyl)pyridine (aep), 2,2'-dipiridylamine (dpa), 1,2-diaminopropane (1,2 -dap) or trans 1,2-diaminocyclohexane (dch)] have been prepared. The compou nds have been characterized by elemental analyses (C,H,N,S), electronic and i.r. spectroscopy, magnetic and conductivity measurements and by cyclic vo ltammetry. The results show that all complexes behave as non-electrolytes i n acetone. Electronic spectra and magnetic moments suggest a distorted cis- octahedral geometry around the Ni-II atom [mu(eff)/mu(B) is an element of < 3.10, 3.40 >], except for [Ni(i-Am(2)dtp)(2)(aep)], where the measured tem perature dependence of the magnetic susceptibility proved the tetrahedrally coordinated nickel [4.06 mu(eff)/mu(B) (298 K) - 3.20 mu(eff)/mu(B) (80 K) ]. In the [Ni(i-Am(2)dtp)(2)(neo)] complex, the nickel atom is penta-coordi nated. The X-ray crystal and molecular structure of [Ni(i-Am(2)dtp)(2)(1,2- dap)] has been determined.