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)2Cl 4 (II), Cu(L3)(NO3)2 (III), and Cu(L3)(H2O)(NO3)2 • 2H 2O (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.
|Number of pages||12|
|Journal||Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya|
|Publication status||Published - 1 Dec 2007|
ASJC Scopus subject areas
- Chemical Engineering(all)