Crystal and molecular structure of bis(N-benzoylglycinato)triaquozinc(II) dihydrate

Abstract

The crystal structure of bis(N-benzoylglycinato)-triaquozinc(II) dihydrate was determined from three-dimensional X-ray data collected by counter methods. The colourless crystals are triclinic with the space group P1. The unit cell parameters are a = 5.157(2), b = 5.192(2), c = 20.092(9) Å, α= 83.60(4)°, β = 86.19(4)°, γ = 83.42(3)°, V = 530.3 Å 3 and Z = 1. The structure was solved from 2332 reflections and was refined to an R index of 0.043. The zinc atom in the molecule is coordinated by an oxygen atom of the carboxyl group of each N-benzoylglycinate anion and by three water molecules, resulting in a 5-coordinated, slightly distorted trigonal bipyramidal geometry with two water molecules occupying the apical positions. The mean ZnO (basal) and ZnO(apical) distances are 1.988 and 2.165 Å, respectively. All metal-bonded and all free water molecules are engaged in a network of intermolecular and intramolecular hydrogen-bonding.