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

Abstract

The PdII ion in the title complex, [PdBr2(C14H10N4)], is four-coordinated in a slightly distorted square-planar environment by the two pyridine N atoms of the chelating 2,3-di-2-pyridyl­pyrazine (dpp) ligand and two bromide anions. The pyridine rings are considerably inclined to the least-squares plane of the PdBr2N2 unit [maximum deviation = 0.080 (2) Å], making dihedral angles of 64.9 (1) and 66.4 (1)°. The pyrazine ring is perpendicular to the unit plane, with a dihedral angle of 89.0 (1)°. In the crystal, the complex mol­ecules are stacked in columns along the a axis and connected by C—H⋯Br hydrogen bonds, forming a helical chain along the b axis.

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…”