Phenolate- and Acetate (Both μ<sub>2</sub>-1,1 and μ<sub>2</sub>-1,3 Mode)-Bridged Face-Shared Trioctahedral Linear Ni<sup>II</sup><sub>3</sub>, Ni<sup>II</sup><sub>2</sub>M<sup>II</sup> (M = Mn, Co) Complexes: Ferro- and Antiferromagnetic Coupling
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The complexes [(L)2NiII2MII(μ2-1,3-OAc)2(μ2-1,1-OAc)2(S)2]·xMeOH [HL = N-methyl-N-(2-hydroxybenzyl)-2-aminoethyl-2-pyridine; M = Ni, S = MeOH, x = 6 (1); M = Mn, S = H2O, x = 0 (2); M = Co, S = MeOH, x = 6 (3)] have been synthesized. Crystal structures reveal that three octahedral MII ions form a linear array with two terminal moieties {(L)NiII(μ2-1,3-OAc)(μ2-1,1-OAc)(MeOH/H2O)}- in a facial donor set and a central MII ion which is connected to the terminal ions via bridging phenolate and two types of bridging acetates. Magnetic measurements reveal that the NiII3 and NiII2CoII centers are ferromagnetically and NiII2MnII center is antiferromagnetically coupled. An attempt has been made to rationalize the observed magneto-structural behavior.
