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

Abstract

Two 3-amino-1,2,4-triazole (Hatz)-based magnetic complexes, {[Mn₃(H₂O)₂(Hatz)₂(sip)₂]·2H₂O}_n (1) and {[Mn(H₂O)₃(Hatz)(bda)]·H₂O}_n (2) (sip³⁻ = 5-sulfoisophthalate and bda²⁻ = 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 {Mn₃(μ-N1,N2-Hatz)₂}⁶⁺ subunits extended by tritopic sip³⁻ connectors. By contrast, 2 is an infinite zigzag chain constructed from octahedral Mn(II) ions and μ-N1,N4-Hatz linkers. Magnetically, typically antiferromagnetic interaction observed in the local Mn^II₃ subunit of 1 mediated by mixed μ-syn, syn-COO⁻ and μ-N1,N2-Hatz heterobridges is slightly stronger than that of 2 transmitted by single μ-N1,N4-Hatz mediator.

Keywords:

• 3-amino-1,2,4-triazole
• dicarboxylate coligand
• crystal structure
• magnetism

Funding

This present work was financially supported by the Tianjin Municipal Education Commission (2012ZD02), the Program for Innovative Research Team in University of Tianjin (TD12-5038), and the Doctoral Foundation of Tianjin Normal University (grant no. 52XB1111), which are gratefully acknowledged.

Supplementary Material

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