Coordination Polymers with Bipyridyl Diene and Triene Ligands: Synthesis, Structures and Luminescent Properties

S olvothermal reactions of cadmium salts with bipyridyl diene and triene ligands[(1,3-bis(( E )-2-(pyridin-4-yl)vinyl)benzene-(1,3-bpeb) and 1,6-bis(4-pyridyl)-1,3,5-hexatriene(bphte)] and one bipyridyl triene ligand[1,6-bis(4-pyridyl)-1,3,5-hexatriene-(bphte)] in the presence of auxiliary carboxylic acids including 2,6-dichlorobenzoic acid(2,6-HDCBA) and 2-naphthal-enecarboxylic acid(2-HNCA) gave rise to four coordination polymers [Cd(bphte)(2,6-DCBA) 2 ] n ( 1 ), {[Cd(bphte)(2-NCA) 2 ]·5.8H 2 O} n ( 2 ), [Cd 2 (1,3-bpeb) 2 (2,6-DCBA) 4 ] n ( 3 ) and {[Cd 4 (1,3-bpeb) 4 (2-NCA) 7 (HCOO)]·2-HNCA·H 2 O} n ( 4 ), respectively. Compounds 1–4 were structurally characterized by elemental analysis, IR, 1 H NMR, powder X-ray diffraction, thermogravimetric analysis and single-crystal X-ray diffraction. They possess one-dimensional linear( 1 , 2 ) and zigzag( 3 , 4 ) chain structures. Their luminescent properties were explored while the representative sample 4 exhibited good luminescent performance in sensing Fe(III) in water.