Crystal and molecular structure of the five-co-ordinate complex diisothiocyanato-[NN-bis-(2-diethylaminoethyl)-2-diphenylarsinoethyl-amine-NNN]-nickel(II)

Abstract

The structure of di-isothiocyanato-[NN-bis-(2-diethylaminoethyl)-2-diphenylarsinoethylamine-NNN]-nickel(II) has been determined by standard X-ray diffraction methods from 2171 observations measured by a densitometer. The unit-cell dimensions are: a= 15·550 ± 0·013, b= 14·552 ± 0·016, c= 18·114 ± 0·015 Å, β= 127° 39′± 4′; space group P2₁/c. The nickel atom is surrounded by a set of five nitrogen atoms, with approximate square-pyramidal geometry. The average of the two Ni–N_(NCS) bond distances is 1·95(1)Å. The central Ni–N bond [2·08(1)Å] formed by the ligand molecule is shorter than the other two Ni–N bonds [2·20(2)Å, average]. The arsenic atom of the ligand does not co-ordinate.