Two 3-Amino-1,2,4-triazole-based Manganese(II) Complexes Incorporated With Different Dicarboxylate Coligands: Synthesis, Structure, and Magnetism

Two 3-amino-1,2,4-triazole (Hatz)-based magnetic complexes, {[Mn-3(H2O)(2)(Hatz)(2)(sip)(2)]center dot 2H(2)O}(n) (1) and {[Mn(H2O)(3)(Hatz)(bda)]H2O}(n) (2) (sip(3-) = 5-sulfoisophthalate and bda(2-) = trans-butenedioate), were respectively prepared by varying dicarboxylate-containing coligands, and were structurally and magnetically characterized. Structural determinations reveal that 1 exhibits a two-dimensional layered structure with linear {Mn-3(mu-N1,N2-Hatz)(2)}(6+) subunits extended by tritopic sip(3-) connectors. By contrast, 2 is an infinite zigzag chain constructed from octahedral Mn(II) ions and mu-N1,N4-Hatz linkers. Magnetically, typically antiferromagnetic interaction observed in the local Mn-3(II) subunit of 1 mediated by mixed mu-syn, syn-COO- and mu-N1,N2-Hatz heterobridges is slightly stronger than that of 2 transmitted by single mu-N1,N4-Hatz mediator.