title: Three-dimensional networks based on trinuclear motifs with tricomponent azide-carboxylate-tetrazolate cobridges: synthesis, structure and magnetic properties.
abstract: Two 3D coordination polymers of Mn(II) with azide and bifunctional zwitterionic ligands bearing both carboxylate and tetrazolate groups, 1-(carboxylatomethyl)-3-(5-tetrazolato)pyridinium (L(1)) and 1-(carboxylatoethyl)-4-(5-tetrazolato)pyridinium (L(2)), were synthesized, and structurally and magnetically characterized. They are formulated as [Mn(3)(L(1))(2)(N(3))(4)(H(2)O)(2)](n)·4nH(2)O (1) and [Mn(3)(L(2))(2)(N(3))(4)(H(2)O)(3)](n)·3.5nH(2)O (2). In both compounds, octahedral Mn(II) ions are linked by the mixed (μ(2)-EO-N(3))(μ(2)-syn,syn-COO)(μ(2)-N(2),N(3)-CN(4)) (CN(4) = tetrazolate and EO = end-on) triple bridges to give anionic linear trinuclear motifs. The motifs are connected through EE-N(3) (EE = end-to-end) bridges to give layers and chains in 1 and 2, respectively, and the cationic pyridinium spacers serve to interlink the layers or chains into three-dimensional frameworks with the α-Po and CdSO(4)-type topology, respectively. Magnetic studies demonstrated that the magnetic interactions within and between the trinuclear motifs, through the tricomponent and EE-N(3) bridges, respectively, are both antiferromagnetic in both compounds.
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai, 200062, China.
authors.forename: Xiu-Bing
authors.initials: XB
authors.lastname: Li
authors.forename: Kun
authors.initials: K
authors.lastname: Wang
authors.forename: Yu
authors.initials: Y
authors.lastname: Ma
authors.forename: En-Qing
authors.initials: EQ
authors.lastname: Gao
authors.forename: Cai-Ming
authors.initials: CM
authors.lastname: Liu