Synthesis, spectroscopic and crystal structure study of NaMn(pyrazinato)(N 3) 2(H 2O) 2. A polymeric structure containing (μ-1,1,3)-bridging azido ligands between manganese and sodium centred polyhedra

Abstract

The complex [NaMn(pyrazinato)(N 3) 2(H 2O) 2] has been synthesized and characterized by spectroscopic methods and X-ray crystallography. The infrared and Raman spectral results indicate that the complex contains an N,O-bidentate pyrazinato anion, aqua ligands and asymmetric azido groups. The structure of the complex features an octahedrally coordinated manganese atom as well as six-coordinated sodium atom. Each manganese atom, which links a bridging aqua ligand [MnO = 2.244(3) Å] and three μ(1,1,3)-bridging azido ligands [MnN from 2.137(3) to 2.257(3) Å], is chelated by a pyrazinato anion [ via its ring nitrogen atom, MnN = 2.297(3) Å, and a carboxylato oxygen atom, MnO = 2.148(3) Å]. The sodium atom is bonded to three μ(1,1,3)-bridging azido ligands in a facial arrangement [Na-N from 2.415(4) to 2.517(4) Å] and three water molecules [Na-O from 2.368(3) to 2.4403(3) Å] in which two of them act as bridges between two sodium octahedra. The manganese and sodium octahedra have a common edge via an aqua ligand and an azido group.