Transition metal complexes with thio­semicarbazide-based ligands. LIII. [4-(2-Diphenyl­phosphino-α-ethoxy­benzyl-κP)-S-methyl-1-(4-oxidopent-3-en-4-ylidene-κO)thio­semicarbazido-κ2N1,N4]nickel(II)

Abstract

The title compound, [Ni(C 28 H 30 N 3 O 2 PS)], crystallizes with two independent molecules in the asymmetric unit. The Ni II atoms are in significantly deformed square-planar environments formed by an ONNP donor set from a thiosemicarbazide-based tetradentate ligand. The Ni II atom and the ONN donor atoms are nearly coplanar, while the P atom deviates from their mean planes by 0.278 (4) and 0.202 (4) A for the two independent molecules. The P-containing chelate rings are remarkably non-planar, adopting a boat conformation, which is unusual for chelate rings in transition metal complexes with thiosemicarbazide-based tetradentate ligands. The orientation of the ethoxy group bonded to this chelate ring is caused by an intramolecular C-H⋯μ interaction with the opposing phenyl ring. There are no hydrogen bonds; instead, numerous intermolecular C-H⋯μ interactions dominate in the crystal packing. © 2006 International Union of Crystallography.