Synthesis and crystal structure of a PdII complex of ortho-xylylenebis(pyridyl-triazole).

Abstract

A tetra-dentate ligand, namely, ortho-xylylenebis(pyridyl-triazole), o-xpt, was synthesized using the 'click' method and complexed with Pd(BF4)2. In the title com-plex, bis-{μ-1,1'-(o-xylylene)bis-[4-(pyridin-2-yl)triazole]-κN 3:N 3'}dipalladi-um(II) tetra-kis-(tetrafluoridoborate)-di-methyl-formamide-diethyl ether (1/2/1), as the BF4 salt, and including di-methyl-formamide and diethyl ether solvent mol-ecules, with stoichiometry [Pd2(C22H18N8)2](BF4)4·2C3H7NO·C4H10O, the Pd complex and the disordered diethyl ether mol-ecule lie on inversion centers. The ligand coordinates to the PdII centers with square-planar geometry, forming a dimeric macrocycle. The Pd⋯Pd separation in the complex [Pd2(o-xpt)2]4+ cation is 3.6184 (4) Å. In the crystal, the complex mol-ecules are stacked along the b axis, with π-π inter-actions between the pyridyl-triazole ligands of two mol-ecules.