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- Title
A New Class of Heterobinuclear Complexes: Crystal Structure and Magnetism of Copper(II)-Nickel(II) Complexes Incorporating Two Different Macrocyclic Ligands.
- Authors
Gao, En-Qing; Tang, Jin-Kui; Liao, Dai-Zheng; Jiang, Zong-Hui; Yan, Shi-Ping; Wang, Geng-Lin
- Abstract
Three novel oxamido-bridged heterobinuclear copper(II)-nickel(II) complexes incorporating two different tetraazamacrocyclic compounds were synthesized and characterized by IR, ESR, and electronic spectra. They are of the formulas [(CuL1)Ni( rac-cth)](ClO)42⋅H2O ( 1), [Cu(L2)Ni( rac-cth)](ClO4)2⋅0.5 EtOH ( 2), and [(CuL3)Ni( rac-cth)](ClO4)2⋅H2O ( 3). L1, L2, and L3 are the dianions of diethyl 5,6,7,8,16,17-hexahydro-6,7-dioxo-15 H-dibenzo[ e, n][1,4,8,12]tetraazacyclopentadecine-13,19-dicarboxylate, diethyl 5,6,7,8,15,16-hexahydro-6,7-dioxodibenzo[1,4,8,11]tetraazacyclotetracine-13,18-dicarboxylate, and diethyl 5,6,7,8,15,16-hexahydro-15-methyl-6,7-dioxodibenzo[1,4,8,11]tetraazacyclotetradecine-13,18-dicarboxylate, respectively, and rac-cth is rac-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane. The crystal structures of 1 and 2 were determined by single-crystal X-ray analysis. The NiII ion is pseudooctahedrally coordinated. The coordination geometry around the CuII ion in 2 is slightly distorted square planar, while that in 1 shows significant distortion towards a tetrahedral structure. The temperature dependence of the magnetic susceptibility for 1 and 2 was analyzed by means of the Hamiltonian Hˆ=−2 J Sˆ1⋅ Sˆ2, leading to J=−63.9 and −67.4 cm−1 for 1 and 2, respectively.
- Publication
Helvetica Chimica Acta, 2001, Vol 84, Issue 4, p908
- ISSN
0018-019X
- Publication type
Article
- DOI
10.1002/1522-2675(20010418)84:4<908::AID-HLCA908>3.0.CO;2-Q