A new 3D fourfold interpenetrated metal-organic framework , [Co(L) 2 (SO 4)]·H 2 O (1), has been synthesized by the solvothermal reaction of L with CoSO 4 ·6H 2 O (L = 1,4-bis(imidazolyl)benzene). Compound 1 crystallizes in the monoclinic space group P2 1 /n, with the cell parameters: a = 9.943(2), b = 21.7104(15), c = 13.2658(18) ˚ A, β = 97.638(3) • , V = 2838.2(8) ˚ A 3 , R 1 = 0.0566 and wR 2 = 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, χ m −1 it obeys the Curie-Weiss law with C =2.68 emu K mol −1 and Θ = −2.59 K.
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