Synthesis, structures, magnetic and electric properties of four new coordination polymers constructed with heterocyclic nitrogen ligands and multidentate organic acid

Abstract

Four new coordination polymers based on heterocyclic nitrogen and aromatic carboxylic acids, namely [Co(L1)(2,5-TDC)(H2O)]n (1), [Co(L1)(1,3-BDC)]n (2), [Cu(L2)(1,4-NDC)]n (3), and [Mn(L2)2(2-AIOC)(H2O)]n (4) [L1 = 3,6-bis(1H-imidazol-1-yl)pyridazine, L2 = 3,6-bis(1H-benzo[d]imidazol-1-yl) pyridazine, 1,2-H2TDC = 2,5-thiophenedicarboxylic acid, 1,3-H2BDC = benzenedicarboxylic acid, 1,4-H2NDC = 1,4-naphthalenedicarboxylic acid, 2-H2AIOC = 2-aminoterephthalic acid] have been hydro-/solvothermally prepared and further characterized. 1 and 2 show 2D plane structure which belong to typical sql and sp topological net, respectively. 3 is a six-connected 3D framework with a pcu topological net and 4 belongs to a 3D supramolecular structure constructed via hydrogen bonds. Magnetic tests revealed that 1–3 presence the antiferromagnetic behavior, while 4 displays a ferrimagnetic behavior. The electrochemical measurements explained that 3 possesses excellent cycling stability that it can retain about 91.1% of original capacitance after cycling 10,000 times at 3 A g−1 in 2 mol L−1 KOH aqueous electrolyte.