Cadmium Glutarate Coordination Polymers Containing Hydrogen-Bonding Capable Tethering Organodiimines: From Double Interpenetration to Supramolecular Cavities Containing an Unprecedented Water Tape Morphology

Two cadmium glutarate coordination polymers incorporating the hydrogen-bonding capable tethering organodiimines 4,4′-dipyridylamine (dpa) or bis(4-pyridylmethyl)piperazine (bpmp) have been prepared and structurally characterized. [Cd(glutarate)(dpa)]n (1) manifests a doubly interpenetrated decorated α-Po (pcu, 41263 topology) lattice, with octahedral coordination at cadmium. Compound 1 undergoes blue-violet luminescence upon UV irradiation. Use of the longer tethering organodiimine resulted in the formation of {[Cd(glutarate)(bpmp)(H2O)]·6H2O}n (2), which displays non-interpenetrated (4,4)-rhomboid grid coordination polymer layers. In contrast to 1, the cadmium ions in 2 adopt a pentagonal bipyramidal coordination geometry, with aqua ligands allowing construction of a hexagonal boron nitride (bnn, 4466 topology) supramolecular framework through interlayer hydrogen bonding. Unprecedented one-dimensional water molecule tapes with 2T5(2)7(2) classification occupy large ellipsoid channels coursing through the...