Effect of aliphatic dicarboxylate tether on topology in luminescent cadmium coordination polymers containing bis(4-pyridylformyl)piperazine

Hydrothermal synthesis has generated a series of luminescent cadmium aliphatic dicarboxylate coordination polymers containing the neutral multitopic bis(4-pyridylformyl)piperazine (bpfp) ligand, which were characterized by single-crystal X-ray diffraction, luminescence spectroscopy. {[Cd(suc)(bpfp)(H2O)]·2H2O}n (1, suc = succinate) has a simple yet very rare 4-connected 658 layered topology. {[Cd(dmg)(bpfp)(H2O)]·H2O}n (2, dmg = 2,2-dimethylglutarate) also shows a 4-connected net, but with a 3-fold interpenetrated sra 42638 topology. {[Cd(Hemg)2(bpfp)(H2O)]·2H2O}n (3, emg = 3-ethyl, 3-methylglutarate) is a simple 1-D chain coordination polymer. {[Cd2(adp)(bpfp)2(H2O)2](ClO4)2·2H2O}n (4, adp = adipate) has {Cd2O2} dimeric units linked by adp and exotridentate bpfp ligands into a rare (3,8)-connected tfz-d binodal topology. The oxoanion free derivative [Cd(adp)(bpfp)]n (5) shows a non-interpenetrated 6-connectd pcu topology.