Structure and magnetic properties of a three-dimensional cobalt metal-organic framework

Abstract

A new 3D fourfold interpenetrated metal-organic framework, [Co(L) 2(SO4)]·H2O (1), has been synthesized by the solvothermal reaction of L with CoSO4·6H2O (L = 1,4-bis(imidazolyl)benzene). Compound 1 crystallizes in the monoclinic space group P21/n, with the cell parameters: a = 9.943(2), b = 21.7104(15), c = 13.2658(18) Å , β = 97.638(3)°, V = 2838.2(8) Å3, R1 = 0.0566 and wR2 = 0.1035. It represents a novel dia net, in which the cobalt atoms are alternately bridged by the imidazolyl N atoms of the ligands L into a three-dimensional network. Compound 1 displays antiferromagnetic interactions. From 2 to 300 K, χm -1 it obeys the Curie-Weiss law with C =2.68 emuKmol-1 andθ = -2.59 K. © 2011 Verlag der Zeitschrift für Naturforschung, Tübingen.