American Chemical Society
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1D to 3D Heterobimetallic Complexes Tuned by Cyanide Precursors: Synthesis, Crystal Structures, and Magnetic Properties

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posted on 2014-04-07, 00:00 authored by Daopeng Zhang, Weijiang Si, Ping Wang, Xia Chen, Jianzhuang Jiang
Five new heterobimetallic complexes, namely, {[Ni­(L)]­[Fe­(bpb)­(CN)2]}­ClO4 (L = 2,12-dimethyl-3,7,11,17-tetraazabicyclo[11.3.1]­heptadeca-1(17),13,15-triene, bpb2– = 1,2-bis­(pyridine-2-carboxamido)­benzenate) (1), {[Ni­(L)]3[M­(CN)6]2}·7H2O (M = Fe (2), Cr (3)), {[Ni­(L)]2[Mo­(CN)8]}·CH3CN·13H2O (4), and {[Ni­(L)]2[W­(CN)8]}·16H2O (5), were assembled from the polyaza macrocycle nickel­(II) compound and five cyanidometalate precursors containing different numbers of cyanide groups. Single-crystal X-ray diffraction analysis reveals their different structure ranging from a cyanide-bridged cationic polymeric single chain for 1, a two-dimensional network for 2 and 3, and a three-dimensional network for 4 and 5. In addition, a systematic investigation over the magnetic properties of 13 indicates the ferromagnetic magnetic coupling between neighboring Fe­(III)/Cr­(III) and Ni­(II) ions through the bridging cyanide group. For complex 1, the magnetic susceptibility has been simulated by the Seiden model using the Hamiltonian H = –Ji=0NSiSi+1, leading to the magnetic coupling constant of J = 3.67 cm–1. The two-dimensional magnetic complexes exhibit three-dimensional magnetic ordering behavior with a magnetic phase transition temperature of TC = 4.0 K for 2 and TN = 6.0 K for 3, respectively.