Solvent effect on the structures of three manganese complexes based on azotetrazole-3-hydroxy-2-naphthoic acid: synthesis, structures, and magnetic and fluorescent properties

Abstract

Three Mn^II complexes, named Mn₂(HATNA)₂(CH₃OH)₄ (1), {[Mn₃(ATNA)₂(DMF)₂(H₂O)₂]·0.5DMF·0.5H₂O}_n (2, DMF = N,N-dimethylformamide), and {[Mn₆(ATNA)₄(H₂O)₁₀]·8DMSO·2.5H₂O}_n (3, DMSO = dimethyl sulphoxide), were successfully synthesized by the reaction of the ligand azotetrazole-3-hydroxy-2-naphthoic acid (H₃ATNA) and Mn(CH₃COO)₂ in CH₃OH, DMF, and DMSO, respectively. A binuclear structure was found for complex 1, with the two Mn(II) ions doubly bridged through N–N linkers from the two tetrazole rings. Both 2 and 3 displayed one-dimensional structures. Magnetic studies show that antiferromagnetic interactions of Mn(II) ions existed in complexes 1–3. All the complexes exhibited luminescence emission peaks at room temperature.