Chlorido{N 2,N 6-dibenzyl-N 2,N 6-bis[(diphenylphosphanyl)methyl]pyridine-2,6-diamine}methylplatinum(II)

In the title mononuclear complex, [Pt(CH3)Cl(C45H41N3P2)], the pyridine-2,6-diamine ligand can be viewed as a centrosymmetric motif having two pendant N-benzyl-N-[(diphenylphosphanyl)methyl] arms, the two P atoms of which chelate to the PtII ion, forming a ten-membered metallocycle. A distorted square-planar coordination geometry around the PtII atom is completed by a methyl ligand and a chloride ion. The packing between the mononuclear units is achieved through C—H⋯π interactions, which link the molecules into chains along the c axis.

In the title mononuclear complex, [Pt(CH 3 )Cl(C 45 H 41 N 3 P 2 )], the pyridine-2,6-diamine ligand can be viewed as a centrosymmetric motif having two pendant N-benzyl-N-[(diphenylphosphanyl)methyl] arms, the two P atoms of which chelate to the Pt II ion, forming a ten-membered metallocycle. A distorted square-planar coordination geometry around the Pt II atom is completed by a methyl ligand and a chloride ion. The packing between the mononuclear units is achieved through C-HÁ Á Á interactions, which link the molecules into chains along the c axis.  Zhang & Cheng (1996). For a coordination complex of the 2,6-bis(N-benzyl-N-diphenylphosphinomethylamino)pyridine ligand, see: Li et al. (2005). For C-H(benzene)Á Á Á interactions, see: Umezawa et al. (1998).

Experimental
The 2,6-bis(N-benzyl-N-diphenylphosphinomethylamino)pyridine (L) was synthesized through the procedure as the literature (Li et al., 2005). The solid of Pt(COD)MeCl (0.210 g, 0.60 mmol) was added to the solution of L (0.411 g, 0.6 mmol) in CH 2 Cl 2 (30 ml) and the mixture was stirred for one hour at room temperature. The yellow solvent was removed under vacuum and the title complex was obtained as a yellow powder, the block like crystals of which were obtained after four days by recrystallization from CH 2 Cl 2 /n-hexane (0.447 g, 80% yield).

Refinement
The hydrogen atoms were placed in idealized positions and allowed to ride on the relevant carbon atoms, with C-H = 0.93, 0.97 and 0.96 Å for aryl, methylene and methyl hydrogens, respectively. U iso (H) = 1.2U eq (C).

Special details
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > 2sigma(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.