{5,5′-Dimethoxy-2,2′-[2,2-dimethylpropane-1,3-diylbis(nitrilomethanylylidene)]diphenolato}palladium(II)

In the title compound, [Pd(C21H24N2O4)], the complete molecule is generated by crystallographic mirror symmetry with the Pd and three C atoms lying on the mirror plane. The Pd—O and Pd—N distances are 1.9932 (6) and 2.0029 (7) Å, respectively. The dihedral angle between two benzene rings of the ligand is 79.21 (4)°. In the crystal, C—H⋯O hydrogen bonds link the molecules into layers parallel to the ab plane. These planes are further connected by C—H⋯O interactions, forming a three-dimensional network.

In the title compound, [Pd(C 21 H 24 N 2 O 4 )], the complete molecule is generated by crystallographic mirror symmetry with the Pd and three C atoms lying on the mirror plane. The Pd-O and Pd-N distances are 1.9932 (6) and 2.0029 (7) Å , respectively. The dihedral angle between two benzene rings of the ligand is 79.21 (4) . In the crystal, C-HÁ Á ÁO hydrogen bonds link the molecules into layers parallel to the ab plane. These planes are further connected by C-HÁ Á ÁO interactions, forming a three-dimensional network.  Islam et al. (2011). For the stability of the temperature controller used in the data collection, see : Cosier & Glazer (1986).
In the title compound, the complete molecule ( Fig. 1) is generated by crystallographic mirror symmetry with the Pd1, C9, C10 and C11 atoms lying on the mirror plane. All parameters are within normal ranges and comparable with the related structures (Wan Nazihah Wan Ibrahim et al., 2008). The Pd-O and Pd-N distances are 1.9932 (6)Å and 2.0029 (7)Å respectively. The dihedral angle between two benzene ring (C1-C6 & C1A-C6A) is 79.21 (4)°.
In the crystal packing, the molecules are linked by C8-H8A···O1 i intermolecular into layers parallel to the ab-plane.

Experimental
The complex obtained was synthesized by dissolving the N,N′-bis(4-methoxy-salicylidene)-2,2-dimethylpropane-1,3-diamine ligand (0.2000 g, 0.54 mmol) in dry acetonitrile (10 ml) in a three necked round bottom flask. Palladium(II) acetate (0.1212 g, 0.54 mmol) which was dissolved separately in dry acetonitrile (10 ml) was then added into the flask containing the ligand solution. The mixture was stirred and refluxed under N 2 gas atmosphere for 3 h. The yellow solid formed was separated by vacuum filtration, washed with cold acetonitrile and allowed to dry in vacuo. The solid product was then recrystallized from a mixture of dicholoromethane/methanol (1:1 v/v). Slow evaporation of the solvent at room temperature over several days gave yellow crystals (yield: 78%). Melting point: 596 K-598 K.

Refinement
All H atoms attached to C atoms were fixed geometrically and refined as riding with C-H = 0.95-0.99 Å and U iso (H) = 1.2U eq (C) or 1.5U eq (C-methyl). A rotating group model was applied to the methyl group.

Computing details
Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009 (Cosier & Glazer, 1986) operating at 100.0 (1) K. Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s 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 > σ(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.