Hydrothermal syntheses and crystal structures of PbII coordination polymers based on a N,O-donor ligand

In this article, four new lead(II) coordination polymers based on a N,O-donor ligand 2'-(1 H-1,3,7,8-tetraazacyclopenta[l]phenanthren-2-yl)bipheny1-2-carboxylic acid (HL) have been hydrothermally synthesized, namely, [PbL2]center dot 2H(2)O (1), [PbL2]center dot 2H(2)O center dot CH3CH2OH (2), [Pb5L2(m-BDC)(4)]center dot 3H(2)O (3) and [Pb2L2(p-BDC)) (4), where m-BDC = 1,3-benzenedicarboxylate and p-BDC= 1,4-benzenedicarboxylate. Compound 1 shows a 2D bilayer structure, which is further extended into a 3D supramolecular structure through pi-pi stacking interactions. Compound 2 shows a 3D supramolecular structure based on a zero-dimensional molecule by pi-pi stacking interactions of neighboring molecules. Compound 3 shows a 2D layer structure. Compound 4 displays a 1D chain-like structure, which is then stacked by pi-pi interactions to result in a 2D supramolecular structure. Solid-state luminescent spectra of four lead(II) complexes indicate intense fluorescent emissions. (C) 2012 Elsevier B.V. All rights reserved.