Dinuclear Zinc(II) Complex with a Cyclam-based Ligand with Four Schiff-base Pendant Arms

Abstract

Dinuclear zinc(II) complex with 1,4,8,11-tetrakis(salicylideneaminoethyl)-1,4,8,11-tetraazacyclotetradecane (H₄tsaec), [Zn₂(tsaec)]·2CHCl₃, was synthesized. The crystal structure was determined by the single-crystal X-ray diffraction method at 293 K. The complex crystallizes in the monoclinic space group P2₁/c with a = 9.496(3), b = 11.568(3), c = 23.338(7)Å, β = 96.270(4)°, V = 2548.3(12)ų, D_calcd = 1.505 g/cm³, Z = 2. The R1 [I > 2σ(I)] and wR2 (all data) values are 0.0407 and 0.1034, respectively, for all 6119 independent reflections. The two zinc(II) atoms are bound to the tsaec ligand outside the central teraazacyclotetradecane ring with an intramolecular Zn···Zn distance of 9.426(2)Å, where each zinc(II) atom is coordinated by two Schiff-base pendant arms with two phenolato-oxygen and two imino-nitrogen atoms to form a distorted tetrahedral geometry.