Nuclearity control of manganese polymers dependent on structural differences in the coligands and magnetic properties studies

Abstract

A series of polymers containing Mn^II clusters varying from dinuclear, tetranuclear, hexanuclear, to rod-shaped uniform chains has been synthesized. The polymer [Mn₄(Htci)₂(ptptp)₂(H₂O)₆]·8H₂O (1) (H₃tci = tris(2-carboxyethyl)isocyanurate, H₂ptptp = 2-(5-{6-[5-(pyrazin-2-yl)-1H-1,2,4-triazol-3-yl]pyridin-2-y-1H-1,2,4-triazol-3-yl}pyrazine) shows an interesting ladder based on dinuclear Mn clusters. The polymer {[Mn₃(tci)₂(pbbm)(H₂O)₃]·H₂O}_n (2) (pbbm = 1,1′-(1,5-pentanediyl)bis-1H-benzimidazole) has a 2D 3,6-connected framework with tetranuclear and dinuclear Mn clusters. The polymer {[Mn₃(tci)₂(bbbm)(H₂O)₃](H₂O)}_n (3) (bbbm = 1,1′-(1,4-butanediyl)bis-1H-benzimidazole) belongs an uncommon 3D 3,12-connected framework assembled by hexanuclear clusters. And the polymer {Mn(Htci)(dpp)}_n (4) (dpp = 1,3-di(4-pyridyl)propane) based upon rod-shaped uniform Mn chains exhibits a 2D framework. Magnetic susceptibility measurements indicate that all of the polymers show weak antiferromagnetic interactions.