title: Synthesis and physicochemical characterization of two lead(II) complexes with O-, N-donor ligands. Lone pair functionality and crystal structure.
abstract: A dinuclear [Pb2(4-CHO-5-MeIm)6(NO3)2](NO3)2 (1) and a polynuclear [Pb(2-pzc)2(H2O)]n (2) complexes (where 5(4)-carbaldehyde-4(5)-methylimidazole (5(4)-CHO-4(5)-MeIm) and pyrazine-2-carboxylic acid (2-pzcH)) have been synthesized and characterized by elemental analysis, IR spectroscopy and X-ray crystallography. Structural determination for complex 1 reveals a cationic species [Pb(4-CHO-5-MeIm)3]2+ connected through bridging nitrate(V) ions. There are also an uncoordinated nitrate ions as counterions. Complex 2 is a three-dimensional architecture consisting of Pb6O12 building units. The pyrazine-2-carboxylato ligand behaves as a chelating agent and a bi-connective bridge. The coordination polyhedra around lead(II) ion could be described as a distorted docecahedron (1) or monocapped trigonal prism (2). The luminescent properties of 1 and 2 investigated in the solid state at room temperature indicate structure-dependent photoluminescent properties. The DFT calculations and the X-ray structural data point on rather hemidirected type of coordination around Pb(II) ions of 1 and 2.
authors.affiliation: Institute of Chemistry, Jan Kochanowski University, 15G Świętokrzyska Str., 25-406 Kielce, Poland. Electronic address: joanna.masternak@ujk.edu.pl.
authors.forename: Joanna
authors.initials: J
authors.lastname: Masternak
authors.affiliation: Institute of Chemistry, Jan Kochanowski University, 15G Świętokrzyska Str., 25-406 Kielce, Poland.
authors.forename: Barbara
authors.initials: B
authors.lastname: Barszcz
authors.affiliation: Faculty of Chemistry, Jagiellonian University, 3 Ingardena Str., 30-060 Kraków, Poland.
authors.forename: Maciej
authors.initials: M
authors.lastname: Hodorowicz
authors.affiliation: Chemistry Department, Taras Shevchenko National University of Kyiv, 64 Volodymyrska Str., Kyiv UA-01601, Ukraine.
authors.forename: Oleksiy V
authors.initials: OV
authors.lastname: Khavryuchenko
authors.affiliation: Institute of Physical Chemistry, Polish Academy of Sciences, 44/52 Kasprzaka Str., 01-224 Warsaw, Poland.
authors.forename: Alina
authors.initials: A
authors.lastname: Majka
mesh_terms: D055598:Chemical Phenomena; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004055:Differential Thermal Analysis; D006860:Hydrogen Bonding; D007854:Lead / Q000737:chemistry*; D008024:Ligands; D049449:Luminescence; D008958:Models, Molecular; D011108:Polymers / Q000737:chemistry; D011789:Quantum Theory; D013050:Spectrometry, Fluorescence; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry
chemical_list: D056831:Coordination Complexes; D008024:Ligands; D011108:Polymers; D007854:Lead
keywords: Lead(II) complexes; Lone pair stereoactivity; Luminescence properties; X-ray structure