Synthesis and crystal structure of a PdII complex of ortho-xylylenebis(pyridyltriazole)

Abstract

A tetradentate ligand, namely, ortho-xylylenebis(pyridyltriazole), o-xpt, was synthesized using the `click' method and complexed with Pd(BF4)2. In the title complex, bis{μ-1,1′-(o-xylylene)bis[4-(pyridin-2-yl)triazole]-κN 3:N 3′}dipalladium(II) tetrakis(tetrafluoridoborate)–dimethylformamide–diethyl ether (1/2/1), as the BF4 salt, and including dimethylformamide and diethyl ether solvent molecules, with stoichiometry [Pd2(C22H18N8)2](BF4)4·2C3H7NO·C4H10O, the Pd complex and the disordered diethyl ether molecule 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 molecules are stacked along the b axis, with π–π interactions between the pyridyltriazole ligands of two molecules.