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Synthesis, Crystal Structure, Magnetic Properties, and EPR of Cu(bp3ca)Br2·H2O (bp3ca = 2,2‘-Bipyridine-3,3‘-dicarboxylic Acid). Ferromagnetic Interactions via Unsymmetrical Bromide Bridges

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journal contribution
posted on 1997-09-24, 00:00 authored by Sindhu Menon, M. V. Rajasekharan, J.-P. Tuchagues
Cu(bp3ca)Br2·H2O crystallizes in the triclinic space group P1̄ with a = 10.622(2) Å, b = 10.832(2) Å, c = 14.684(2) Å, α = 106.13(1)°, β = 105.91(1)°, γ = 102.74(1)°, and Z = 2. The asymmetric unit consists of a bis μ-bromo unsymmetrically dibridged dimer which is further linked to its inversion-related partner to form a dimer of dimers. Weak intertetramer contacts are also observed. The magnetic data for this compound were fit to a linear tetramer model to give J1 = J3 = −8.69 × 10-3 cm-1, J2 = 91.52 cm-1, and the intertetramer interaction J‘ = −1.187 cm-1 with g = 1.93. EPR data are consistent with the magnetic data. This system is compared to its previously reported chloro counterpart, which differs markedly in both structure and magnetic properties.

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