Abstract
Two cyanato-bridged dinuclear Mn(II) complexes [Mn2(phen)4(μ 1,1-NCO)2][MIII(bpb)(CN)2]·H2O [M = Fe (1) or Co (2)], [phen = 1,10-phenanthroline, bpb2− = 1,2-bis(pyridine-2-carboxamido)benzenate] have been synthesized using the synthetic strategy of big anion inducement. Single-crystal X-ray diffraction analysis reveals that both complexes consist of a double end-on (EO) cyanato-bridged dinuclear Mn(II) unit and two free [M(bpb)(CN)2]− building blocks acting as counter-ions. Magnetic studies show the presence of abnormal antiferromagnetic interactions between the two Mn(II) centers through the EO cyanate bridge with J = −1.58(3) cm−1 for complex 1 and −1.82(2) cm−1 for complex 2. The unusual antiferromagnetic interactions of these complexes can be attributed to their small Mn(II)–N–Mn(II) angles.
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