Trinuclear Cu(II) complex with tetrazolyl-pyridine units as a bridging ligand: synthesis, characterization and X-ray structure
摘要:
Reaction of 5-(2-pyridyl)tetrazole with 1,3-dibromopropane afforded three regioisomeric multidentate ligands L-1, L-2 and L-3 containing two tetradentate pyridyl/tetrazolyl units linked by a flexible propylene spacer. These compounds were fully characterized by IR, H-1 and C-13 NMR spectroscopy and elemental analysis. The crystal structure of L-1 was determined. With Cu(II), L-1 formed a trinuclear complex Cu-3(L-1)(2)Cl-6. Its structure was determined crystallographically. In the complex, the three copper atoms are found to be in a strict linear arrangement, with the ligand bridging two adjacent copper atoms. The central copper ion is six-co-ordinated. The co-ordination spheres of the terminal copper atoms are distorted square pyramidal. Inter and intramolecular pi, pi-stacking interactions are observed in the free ligand and in complex 1. (C) 2003 Elsevier B.V. All rights reserved.