Luminescent cadmium phenylenediacetate coordination polymers with bis(pyridylformyl)piperazine tethers: Influence of pendant arm position on topology

Hydrothermal synthesis has generated divalent cadmium coordination polymers containing phenylenediacetate (phda) and bis(4-pyridylformyl)piperazine (bpfp) ligands, in which the position of the pendant acetate arms plays a very significant role in structure direction during self-assembly. [Cd(1,2-Hphda)2(4-bpfp)]n (1) exhibits 2-D polymeric layers with embedded anti-syn bridged [Cd(OCO)2]n ribbons. {[Cd(1,3-phda)(4-bpfp)(H2O)]2}n (2) has crystallographically independent (4,4) grids with different carboxylate binding modes, engaged in parallel interpenetration. {[Cd(1,4-phda)(4-bpfp)(H2O)]}n (3) manifests acentric 1-D chains with an uncommon 4-connected 33425 topology instilled by the mismatch in ligand length. Luminescent properties of all phases are also reported.