[Zurück]

A.N. Gusev, I. Nemec, R. Herchel, I. Riush, J. Titis, R. Boca, K. Lyssenko, M. Kiskin, I. Eremenko, W. Linert:
"Structural and magnetic characterization of Ni(II), Co(II), Fe(II) binuclear complexes on bis(pyridyl-triazolyl)alkane basis";
Dalton Transactions (eingeladen), 48 (2019), S. 10526 - 10536.

Reaction of bis[5-(2-pyridyl)-1,2,4-triazol-3-yl]alkanes (alkane spacers = -CH2- in L2, -C3H6- in L3, -C4H8- in L4) with M(II)A2 salts (M = Ni, Co, Fe) resulted in preparation of five series of mononuclear ([M(L2)(H2O)2]2+, 1a-c) or binuclear ([M2(L3)2(H2O)4]4+, 2a-c; ([M2(L4)2(H2O)4]4+, 3a-c, [M2(L3)2(-ox)]2+, 4a-c; [M2(L4)2(-ox)]2+, 5a-c) complexes. The crystal structures of ten complexes were determined by single-crystal X-ray crystallography. Magnetic properties of the compounds were characterized by SQUID magnetometry and were analyzed by fitting on spin Hamiltonian model . It was revealed that Fe(II) and Co(II) compounds exhibit non-negligible anisotropy and in the case of 2a-c and 3a-c complexes weak ferromagnetic interactions between the metal centers were observed. In the case of complexes containing {M2(-ox)}2+ core strong antiferromagnetic interactions were observed within the dimer. Remarakably, solid state luminiscence of Co(II) and Fe(II) complexes (1b, 2b, 3b and 1c, 2c, 3c) was observed.

http://dx.doi.org/10.1039/C9DT01391A