Synthesis and Crystal Structure of a New Hetro-nuclear Cu2Sr Complex of Salen Type Ligand

摘要

A new hetero-trinuclear complex [Cu2(μ-L)2Sr(NO3)2] has been synthesized and characterized by elemental analysis, IR, UV-Vis and X-ray crystallography, where L is a dianionic tetradentate Schiff base ligand with N2O2 donor atoms. The X-ray structure indicates that the trinuclear complex adopts a bent structure for the three metal atoms, with a Cul-Sr-Cu2 intramolecular angle of approximately 99.1°. In the complex, the two terminal Cu ions are situated in a distorted square planar geometry coordinated by two imine nitrogen atoms and two phenolato oxygen atoms from the Schiff base ligand. The two neutral CuL complexes are bonded to a Sr(II) ion. The geometry of central strontium atom is a distorted square antiprism formed by eight oxygen atoms, four oxygen atoms belonging to the two Schiff base li-gands from two units of CuL and four oxygen atoms belonging to the two bidentate nitrate ions. The two bidentate nitrates are cis to each other.