Ramalingam Thirumoorthi

S,C,S-Pnictogen bonding in pincer complexes of the methanediide [C(Ph2PS)2]2−

The metathetical reactions of Li(2)[C(Ph(2)PS)(2)] with MCl(3) (M = Sb, Bi) in a 1:1 molar ratio in toluene afford the complexes {MCl[C(Ph(2)PS)(2)]}(2), which dimerise through weak MS interactions; the S,C,S-coordination of the tridentate ligand to the metal in the monomeric units incorporates a polar M-C single bond and a three-centre two-electron S-M-S bond.

1,1′-(Diselanediylbis{[P,P-diphenyl-N-(tri­methyl­sil­yl)phospho­rimido­yl]methanylyl­idene})bis­[1,1-diphenyl-N-(tri­methyl­sil­yl)-λ5-phosphanamine] pentane disolvate

The title compound, C62H78N4P4Se2Si4·2C5H12, is made up of two [SeC(PPh2NSiMe3)(PPh2NHSiMe3)] units related by an inversion center situated at the mid-point of the diselenide bond. It crystallized with two disordered molecules of pentane used as solvent of crystallization. It is a rare example of an antiperiplanar diselenide and exhibits a long Se—Se bond of 2.4717 (8) Å. The Se—C bond length of 1.876 (5) Å is short in comparison with the range of values found for other diselenides (1.91–1.97 Å). The molecule exhibits two intramolecular N—H⋯N hydrogen bonds. In the crystal, there are no significant intermolecular interactions present. One of the Me3Si– groups is disordered over two positions with a refined occupancy ratio of 0.708 (8):0.292 (8). The contribution of the disordered solvent to the scattering was removed with the SQUEEZE option of PLATON [Spek (2009 ▶). Acta Cryst. D65, 148–155]. The solvent contribution has been included in the reported molecular weight and density.