Novel homochiral holodirected three-dimensional lead(II) coordination polymer, [Pb_2(mu-bpa)_3(mu-NO_3)_2(NO_3)_2]n: Spectroscopic, thermal, fluorescence and structural studies

摘要

A novel homochiral holodirected coordination polymer of lead(II) nitrate with the bridging ligand l,2-bis(4-pyridyl)ethane (bpa), [Pb_2(mu-bpa)_3(mu-NO_3)_2(NO_3)_2]n (1), has been synthesized and characterized by elemental analysis, FT-IR, thermal analysis and single crystal X-ray diffraction. In 1, the lead(II) ions are doubly bridged by both bpa and nitrate ligands into a chiral infinite three-dimensional polymeric network. There are two different nine- and eight-coordinate geometries around the lead(II) ion in 1, in which the lead(II) ions have a less common holodirected geometry. Solid-state luminescent spectra of compound 1 indicate intense fluorescent emission at ca. 434 nm.