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Intramolecular Ferromagnetic Radical-Cu(II) Coupling in a Cu(II) Complex Ligated with Pyridyl-Substituted
Tetsuro Kusamoto1, Yohei Hattori1, Akira Tanushi1
1Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Abstract:
Novel metal complexes M(hfac)2(PyBTM)2 [M = Cu(II), Zn(II); hfac = hexafluoroacetylacetonato; PyBTM = (3,5-dichloro-4-pyridyl)bis(2,4,6-trichlorophenyl)methyl radical] were prepared. Both hexacoordinated complexes had elongated octahedral geometry, in which two PyBTM molecules coordinated at the equatorial positions in Cu(II)(hfac)2(PyBTM)2 but at the axial positions in Zn(II)(hfac)2(PyBTM)2. Magnetic studies revealed an intramolecular ferromagnetic exchange interaction between the spins on PyBTM and Cu(II) (JCu-R/kB = 47 K) based on the orthogonality of the two spin orbitals.
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