title: Intramolecular Ferromagnetic Radical-Cu(II) Coupling in a Cu(II) Complex Ligated with Pyridyl-Substituted Triarylmethyl Radicals.
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.
authors.affiliation: Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Kusamoto
authors.affiliation: Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Yohei
authors.initials: Y
authors.lastname: Hattori
authors.affiliation: Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Tanushi
authors.affiliation: Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nishihara