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) Angstrom 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...pi interaction with the opposing phenyl ring. There are no hydrogen bonds; instead, numerous intermolecular C-H...pi interactions dominate in the crystal packing.

Different intermolecular interactions in azido[2-(diphenylphosphino)benzaldehyde semicarbazonato-κ2P,N1,O]nickel(II)

“…The ring-puckering parameters defined for the atom sequence P1-C4-C3-C2-N1-Ni1 are = 62.0 (8) , ' = À20.1 (8) and Q = 0.337 (3) Å (Cremer & Pople, 1975). A similar deformation of the six-membered chelate ring containing the P atom was observed and explained in more detail in a previous report (Brčeski et al, 2004), and it has also been described in other structural reports (Drašković et al, 2006;Bogdanović et al, 1998). The P atom is the only atom in the chelate ligand which has four bonds and these bonds are in a distorted tetrahedral arrangement.…”