Abstract
The unsymmetrical α-di-imine ligand N-{2-[2,6-bis-(propan-2-yl)phenylimino]pentan-3-yl-idene}-2,6-bis-(propan-2-yl)aniline, [ArN=C(Me)-(Et)C=NAr] [Ar = 2,6-(iPr)2C6H3], (I), and the corresponding palladium complex, cis-(N-{2-[2,6-bis-(propan-2-yl)phenylimino]pentan-3-yl-idene}-2,6-bis-(propan-2-yl)aniline)di-chlor-ido-palladium(II) 1,2-di-chloro-ethane monosolvate, [PdCl2(C29H42N2)]·C2H4Cl2 or cis[PdCl2{I}], (II), have been synthesized and characterized. The crystal and mol-ecular structure of the palladium(II) complex have been established by single-crystal X-ray diffraction. The compound crystallized along with a 1,2-di-chloro-ethane solvent of crystallization. The coordination plane of the PdII atom shows a slight tetra-hedral distortion from square-planar, as indicated by the dihedral angle between the PdCl2 and PdN2 planes of 4.19 (8)°. The chelate ring is folded along the N⋯N vector by 7.1 (1)°.
Highlights
The crystal and molecular structure of the palladium(II) complex have been established by single-crystal X-ray diffraction
The polymer properties, topology and stability of these catalysts can be tuned by altering the steric and electronic properties of the -diimine ligands (Gates et al, 2000). These observations have motivated the synthesis of several nickel and palladium complexes with -diimine ligands containing various substituents at the imine nitrogen atom (Nakamura et al, 2009). -Diimine ligands may be conveniently prepared by condensation reactions between alkyl or aryl amine with 1,2-diketones
We report the synthesis and spectroscopic characterization of the unsymmetrical -diimine ligand
Summary
-Diimines (or) 1,4-diaza-1,3-butadienes (DAD) are one of the most versatile classes of chelating nitrogen-donor ligands, and are well known to stabilize several transition metal complexes at various oxidation levels (Bart et al, 2005; Greene et al, 2014). The polymer properties, topology and stability of these catalysts can be tuned by altering the steric and electronic properties of the -diimine ligands (Gates et al., 2000). These observations have motivated the synthesis of several nickel and palladium complexes with -diimine ligands containing various substituents at the imine nitrogen atom (Nakamura et al, 2009). We report the synthesis and spectroscopic characterization of the unsymmetrical -diimine ligand [ArN C(Et)—(Me)C NAr], (I), [Ar = 2,6-i(Pr)2C6H3] and the corresponding palladium complex cis-[PdCl2{I}] (II), where the -diimine ligand backbone contains methyl and ethyl substituents. Symmetry codes: (i) x þ 1; y; z; (ii) x þ 1; y 12; z þ 32
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