Two acetylenedicarboxylato-bridged 4-styrylpyridine appended 1D coordination polymers: synthesis, structural characterization and variable temperature magnetism

Abstract

Two hitherto unknown one-dimensional coordination polymers (1D CPs) [M(adc)(4-spy)2(H2O)2]n, (M = Mn(II) (1) and Co(II) (2); H2adc = acetylenedicarboxylic acid and 4-spy = 4-styrylpyridine) have been characterized by infrared spectra, elemental analysis, thermogravimetric analyses (TGA), powder X-ray diffraction (PXRD) patterns and single-crystal X-ray diffraction techniques. Both these compounds 1 and 2, are isostructural and construct 3D supramolecular networks by the combination of hydrogen bonding and C–H···π interactions. Interestingly, these two materials exhibit variable temperature magnetic moment. Two new isostructural coordination polymers have been synthesized using linear spacer ligand acetylenedicarboxylate and monodented 4-styrylpyridine ligands. The X-ray crystallographic analysis exhibits that both the compounds form 1D chain structures which undergo hydrogen bonding and C–H···π interactions to furnish 3D supramolecular architectures. Effect of metal ion on variable temperature magnetic moment has been studied.