Syntheses, structural analyses and luminescent property of four alkaline-earth coordination polymers

Four new coordination polymers [Ba(Pzdc)(H2O)]n (1), [Ba(Pzdc)]n (2), [AgSr(Pzdc)(NO3)(H2O)]n (3), [Ag2Ca(Pzdc)2(H2O)]n (4) (H2Pzdc=2, 3-pyrazinedicarboxylic acid) have been synthesized. Compounds 1-3 display 2D topology structures and compound 4 exhibits a 3D topology structure. Fortunately, 1 and 2 undergo reversible dehydration/rehydration of coordinated water molecules.