Abstract
Abstract Four new manganese(II) binuclear complexes have been synthesized and characterized, namely [Mn2(4Br-TPHA)(L)4](ClO4)2 (L denotes 1, 10-phenanthroline (phen), 5-nitro-1, 10-phenanthroline (NO2-phen), 2,2′-bipyridyl (bpy), or 4,4′-dimethyl-2.2′-bipyridyl (Meabpy), respectively), where 4Br-TPHA is the tetrabromoterephthalate dianion. Based on IR, elemental analyses, conductivity measurements, these complexes are proposed to have tetrabromoterephthalato-bridged structures consisting of two manganese(II) ions in which each manganese(II) ion has a distorted octahedral environment. The temperature dependance of mangnetic susceptibility for [Mn2(4Br-TPHA)(phen)4](CIO4)2 · H2O was measured over the range 4–300 K and the observed data were successfully simulated by an equation based on the spin Hamiltonian operator (Ĥ = −2JŜ1·Ŝ2), giving the exchange integral J =−1.02 cnr−1. This indicates weak antiferromagnetic spin exchange interaction between the Mn(II) ions.
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