Some new complexes of nickel(II) halides with N,N′-disubstituted thioureas

Abstract

Some new complexes of nickel(II) halides with sym-diphenyl-, sym-di- n-butyl, symdiallyl-, sym-allylethyl-thioureas have been prepared having general formulas NiL 2 X 2, NiL 4 X 2 and NiL 6 J 2. The compounds of 1:6 type is the first hitherto prepared with substituted thioureas and magnetic studies show that solid compound NiL 2 X 2 have tetrahedral, NiL 4 X 2 tetragonal and NiL 6 J 2 octahedral structures. In all case the thioureas are probably bonded to nickel through their sulfur atom. Magnetic moments of solid 1:4 compound vary with temperature according to a tetragonal structure with a singlet ground state and a thermally populated triplet excited state. In acetone solution all these compounds lose ligands to give tetrahedral species NiL 2 X 2 according to NiLnX 2 → NiL 2 X 2 + ( n−2) L.