A novel coordination polymer based on 2,6-naphthalenedicarboxylic acid: synthesis, crystal structure and luminescence sensing

A novel Cd(II)-based coordination polymer, namely {[Cd3L3(dbp)(2)]}(n) (1), was solvothermally prepared based on the rigid ligand 2,6-naphthalenedicarboxylic acid (H2L) and N-donor linker 4,4 '-dimethyl-2,2 '-bipyridine (dbp). The single-crystal X-ray diffraction analysis shows that compound 1 possesses a fascinating 3D architecture, constructed from a trinuclear secondary building unit [Cd-3(COOR)(6)] and linear L2- linker. The whole structure of compound 1 can be simplified as uninodal 6-connected sxb network with Schlafli symbol of {4(8)5,(4)6(3)}. Compound 1 exhibits strong photoluminescent emissions with emission peak at 425 nm. Most strikingly, 1 could be selectively quenched by Cu2+ ion and nitrobenzene (NB) as potential luminescent sensory material. Meanwhile, vapor-phase fluorescence response of 1 toward NB was also investigated.