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

Abstract

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 [Cd3(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 {485,463}. 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.