Magnetic properties of the alternating-chain compounds Cu(bipy)X2(bipy = 2,2′-bipyridine, X = Br or Cl)

Magnetic susceptibility data have been collected for the complexes Cu(bipy)X2(bipy = 2,2′-bipyridine, X = Br or Cl) in the temperature range 2–300 K. The data were analysed in terms of the alternating-chain Heisenberg exchange model to yield J=–0.83 cm–1 and α= 0.22 for the chloro complex and J=–1.00 cm–1 and α= 0.26 for the bromo complex. This fit is compared with the values obtained by using the Bleaney–Bowers equation for dimeric copper(II) compounds.

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