The Cu(II) complexes with bis(pyrazole-1-yl)methane and its derivatives: Synthesis,crystal structure,and magnetic properties |
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| Authors: | E V Lider O L Krivenko E V Peresypkina A I Smolentsev Yu G Shvedenkov S F Vasilevskii L G Lavrenova |
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| Institution: | (1) Nikolaev Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences, pr. Akademika Lavrent’eva 3, Novosibirsk, 630090, Russia;(2) Institute of Chemical Kinetics and Combustion, Siberian Division, Russian Academy of Sciences, Novosibirsk, Russia |
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| Abstract: | The procedures for the synthesis of the Cu(II) complexes with bis(pyrazole-1-yl)methane (L1), bis(3,5-dimethyl-4-bromopyrazole-1-yl)methane (L2), and bis(3,5-dimethyl-4-iodopyrazole-1-yl)methane (L3) of the composition Cu2(L1)2Br4 (I), Cu2(L2)2Cl4 (II), Cu(L3)(NO3)2 (III), and Cu(L3)(H2O)(NO3)2 · 2H2O (IV) were developed. The organic ligands in the above complexes are coordinated to Cu(II) in a bidentate cyclic type through the N(2), N(2′) atoms of the pyrazole rings. The molecular and crystal structures of L2, L3, II, III, and IV were determined by X-ray diffraction. The study of the μeff(T) function in a temperature interval 2–300 K showed that compound I, which exhibited ferromagnetic exchange interactions in the chains, undergoes transition to antiferromagnetic state with weak ferromagnetism. The exchange antiferromagnetic interactions predominate in compound II. |
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