Syntheses, structures, and magnetic properties of one-dimensional coordination polymers based on N-succinopyridine ligand

Abstract

A series of one-dimensional (1-D) N-succinopyridine-based complexes: [Cu(L⁻)(H₂O)₂]Cl·2H₂O (1), [Pr(L⁻)(H₂O)₄]Cl₂ (2), [Ln(L⁻)(H₂O)₅]Cl₂·3H₂O (Ln = Eu (3), Gd (4)), and [Er(L⁻)(H₂O)₄]Cl₂·H₂O (5) (HL = N-succinopyridine (⁻OOC–CH(N⁺C₅H₅)–CH₂–COOH)) have been prepared and characterized by single-crystal X-ray diffraction. The frameworks of complexes 1, 2 and 5 constructed from dinuclear metal building blocks exhibit 1-D double-strand loop-like chains; these chains are further connected to each other by hydrogen bonds forming a 3-D supramolecular architecture. Whereas complexes 3 and 4 feature hydrogen bonding 2-D supramolecular networks assembled from 1-D chains that are constructed from mononuclear metal building blocks. The effects of different metal ions, steric hindrance and coordination diversities of HL on the polymeric architectures have been discussed. In addition, thermogravimetric and magnetic properties of these complexes were also investigated in this paper.