Abstract
The synthesis, structure and magnetic properties of [Cu(diMe-bipy)Br2] are reported (diMe-bipy=4,4′-dimethyl 2,2′-bipyridine). The complex has a polymeric structure composed of [Cu(diMebipy)Br2] subunits linked via bridging bromine atoms. Each copper atom is hexacoordinated in a distorted octahedral coordination environment. Crystallographic data: monoclinic, space groupC2/c,Z=4, unit cell of dimensionsa=18.312(7),b=9.818(2),c=7.486(2)A,β=107.750(0)° at 293 K. The best fit of the magnetic susceptibility data by the uniform Heisenberg chain model forS=1/2 ions yields values for the exchange coupling constant of −0.46 cm−1. The magnetic susceptibility of the dimeric [Cu(diMe-bipy)Cl2]2·0.5H2O exhibits a maximum near 12 K that is indicative of an antiferromagnetic interaction between the two metal centers. The best fit of the experimental data by the Bleaney-Bowers equation was obtained withg=1.95 andJ=−6.99 cm−1.
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