Synthesis, crystal structure, fluorescence properties of 1D chain Manganese (II) and Cadmium (II) complexes.

Two complexes, {[Mn(3-pmpmd)2(Cl)2]·2H2O}n(1), {[Cd(3-pmpmd) (I)2]·CHCl3·H2O}n(2), (3-pmpmd, N,N'-bis(3-pyridylmethyl)pyromellitic diimide) were synthesized and characterized by elemental analyses, IR spectroscopy, thermogravimetric analyses, and X-ray single-crystal structure analysis. The conformations of 3-pmpmd ligand affect their structural diversity. Complex 1 is a 1D double chain structure in edge-to-edge arrangement by π⋯π interactions. Complex 2 is a typical 1D zigzag chain structure arranged in a parallel array containing 1D channel to accommodate the chloroform and water guest molecules. Thermal stabilities and fluorescence properties of both complexes were investigated. The solution of complex 2 in DMF can sense for I- anion by quenching fluorescence intensity, whereas other anions increasing fluorescence intensity.