Synthesis, structure and luminescent sensing behaviour of a thieno[3,4-b] thiophene-based coordination polymer

Thiophene-based functional materials have always been a research hotspot due to their broad application prospects in fields such as optoelectronics, sensing, biomedical science, etc. Solvothermal reaction of 3,6-di (pyridin-3-yl)-2,4-di(3-pyridylcarbonyl)thieno[3,4-b]thiophene (tptbt) with Cd(OAc)2 center dot 2H2O and 1,4-benzenedicarboxylic acid (1,4-H2bdc) at 100 degrees C gave rise to one coordination polymer {[Cd(1,4-bdc)(tptbt]center dot 0.75H2O}n (1). Complex 1 exhibits a 3D binodal (3,5)-connected network with the (42 center dot 6)(42 center dot 65 center dot 83) topology, which is formed by linking 1D [Cd(tptbt)]n ribbon-like units with 1,4-bdc ligands. The solid state luminescences of tptbt and 1 were investigated. Complex 1 showed outstanding luminescent sensing performances for water, cations Fe3+ and anions Cr2O72- owing to the quenching effect. Moreover, the mechanochromic luminescences of tptbt and 1 were also tested.