Dichlorido(2,3-di-2-pyridylpyrazine-κ²N²,N³)palladium(II)

Abstract

The PdII ion in the title complex, [PdCl2(C14H10N4)], has a slightly distorted square-planar environment defined by the two pyridine N atoms of the chelating 2,3-di-2-pyridyl­pyrazine ligand and two chloride anions. The pyridine rings are considerably inclined to the least-squares plane of the PdCl2N2 unit [maximum deviation = 0.073 (1) Å], with dihedral angles of 64.19 (9) and 66.55 (9)°. The pyrazine ring is almost perpendicular to this plane and the dihedral angle is 88.2 (1)°. Two independent inter­molecular C—H⋯Cl hydrogen bonds, both involving the same Cl atom as a hydrogen-bond acceptor, give rise to chains running along the a and b axes, generating a layer structure extending parallel to (001). Mol­ecules are stacked in columns along the a axis. Along the b axis, successive mol­ecules stack in opposite directions.

Versatility of copper(II) coordination compounds with 2,3-bis(2-pyridyl)pyrazine mediated by temperature, solvents and anions choice

“…The terminal five-membered chelate (I) (38 hits) [8, as well as bridging bis-bidentate chelate (II) (25 hits) [21,31,[38][39][40][41][42][43][44][45][46][47][48] are the dominant ones for the dpp coordination. The terminal seven-membered bidentate mode (III) (9 hits) [49][50][51][52][53][54], the bidentate/monodentate mode (IV) (14 hits) [29,[55][56][57][58][59][60][61], the bidentate/bis-monodentate mode (V) (1 hit) [55], and the bismonodentate mode (VI) (6 hits) [60][61][62][63][64] are less-common. In copper (II) complexes, most frequently the dpp ligand displays the coordination mode I (15 hits) [8,13,22,24,29,30,35,38,55], whereas the II, IV, and V coordination modes are quite rare: 8 hits for mode II…”