Coordination polymers constructed from 2-(2-thienyl)imidazo[4,5-f]1,10-phenanthroline and isophthalate: synthesis, characterization and luminescent property

Two new coordination polymers [Cd(TIP)(1,3-bdc)]n (1) and {[La(TIP)(1,3-bdc)1.5] center dot 0.2H2O}n (2) (TIP = 2-(2-thienyl)imidazo[4,5-f]1,10-phenanthroline and 1,3-H2bdc = isophthalic acid) were synthesized from hydrothermal reactions and characterized by elemental analyses, IR, and single-crystal X-ray diffraction. Complexes 1 and 2 are ribbon structures with different configurations bridged by 1,3-bdc ligand, further extended into 3-D supramolecular structures by - stacking and hydrogen bonding interactions. The most interesting feature of these two complexes is that TIP with the large -system and additional hydrogen bonding group plays a crucial role in the formation of different weak interactions. Thermal properties and fluorescence of 1 and 2 are also investigated in the solid state.