Syntheses and crystal structures of copper(II) complexes derived from 2,4,6-tris(2-pyridyl)-1,3,5-triazine

Abstract

Abstract Treatment of freshly precipitated Cu(OH)2 · xH2O and 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tptz) with oxalic and malonic acids in methanol-water at room temperature gave [Cu(tptz)(C2O4)(H2O)] · 4H2O (1) and [Cu(pma)(C3H2O4)(H2O)] · H2O (2) (pma = 2-aminocarbonylpyridine), respectively. Reaction in the absence of any acid resulted in [Cu(bpca)(tca)] · 2H2O (3) (bpca = bis(2-pyridylcarbonyl)amide anion; tca = 2-pyridinecarboxylate anion). Complex 1 consists of [Cu(tptz)(C2O4)(H2O)] and lattice H2O molecules; the tridentate tptz ligand, bidentate oxalate dianion and an aqua ligand are bound to Cu with distorted octahedral geometry. Complex 2 is composed of [Cu(pma)(C3H2O4)(H2O)] and lattice H2O molecules; the bidentate 2-aminocarbonylpyridine ligand, a bidentate malonate dianion and an aqua ligand are coordinated to Cu with a slightly distorted square pyramidal geometry. Complex 3 consists of [Cu(bpca)(tca)] and lattice H2O molecules. Square pyramidally coordinated Cu atoms are surrounded by tridentate bpca with nitrogen donor atoms and a bidentate 2-pyridinecarboxylate anion. Keywords: Copper(II)N donors2,4,6-Tris(2-pyridyl)-1,3,5-triazineTptz)Crystal structuresLigand reactions Acknowledgements This Project was supported by the Expert Project of Key Basic Research of the Ministry of Science and Technology of China (Grant 2003CCA00800), the Zhejiang Provincial Natural Science Foundation (Grant Z203067), and the Ningbo Science and Technology Bureau (Grants 2006A610061).