New palladium complexes with phosphino- and phosphinitopyridine ligands.

Three new palladium complexes containing a difunctional P,N-chelate, namely tris­(chloro­{[1-methyl-1-(6-methyl-2-pyridyl)ethoxy]diphenylphospine-κ2N,P}methyl­palladium(II)chloro­form solvate, 3[Pd(CH3)Cl(C21H22NOP)]·CHCl3, (III), dichloro­[2-(2,6-dimethyl­phen­yl)-6-(diphenyl­phosphinometh­yl)­pyridine-κ2N,P]palladium(II), [PdCl2(C26H24NP)], (IV), and chloro­[2-(2,6-dimethyl­phen­yl)-6-(diphenyl­phos­phino­meth­yl)pyridine-κ2N,P]methyl­palladium(II), [Pd(CH3)Cl(C26H24NP)], (V), are reported. Geometric data and the conformations of the ligands around the metal centers, as well as slight distortions of the Pd coordination environments from idealized square-planar geometry, are discussed and compared with the situations in related compounds. Non-conventional hydrogen-bond inter­actions (C—H⋯Cl) have been found in all three complexes. Compound (III) is the first six-membered chloro–meth­yl–phosphinite P,N-type PdII complex to be structurally characterized.