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Initial employment of pyridine-2-amidoxime in zinc(II) chemistry: Synthetic, structural and spectroscopic studies of mononuclear and dinuclear complexes |
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| Authors: | Konstantis F Konidaris Eugenia Katsoulakou Vassilis Psycharis Theocharis C Stamatatos Evy Manessi-Zoupa |
| Institution: | a Department of Chemistry, University of Patras, 26504 Patras, Greece b Department of Aquaculture and Fisheries Management, Technological Educational Institute of Messolonghi, 30200 Messolonghi, Greece c Institute of Materials Science, NCSR “Demokritos”, 15310 Aghia Paraskevi, Attikis, Greece d Department of General and Inorganic Chemistry, Faculty of Chemistry, Aristotle University of Thessaloniki, P.O. Box 135, 54124 Thessaloniki, Greece |
| Abstract: | The first employment of pyridine-2-amidoxime (py)C(NH2)NOH] in zinc(II) chemistry is reported. The syntheses, crystal structures, and spectroscopic characterization are described for complexes Zn(O2CR)2{(py)C(NH2)NOH}2] (R = Me; 1, Ph; 2), Zn2(acac)2{(py)C(NH2)NO}2] (3), and Zn(NO3){(py)C(NH2)NOH}2](NO3) (4). The reactions between Zn(O2CR)2·2H2O (R = Me, Ph) or Zn(NO3)2·5H2O and two equivalents of (py)C(NH2)NOH in MeOH led to mononuclear compounds 1, 2 and 4, respectively. All three complexes contain two neutral N,N′-chelating (η2) (py)C(NH2)NOH ligands, coordinated through the Npyridyl and Noxime atoms. In contrast, the use of Zn(acac)2·H2O in place of Zn(O2CR)2·2H2O gives the dinuclear compound 3, which instead contains the anionic, η1:η1:η1:μ bridging form of the organic ligand; the ZnII atoms are doubly bridged by the diatomic oximate groups of the (py)C(NH2)NO− groups. Strong intra- and intermolecular hydrogen bonding interactions provide appreciable thermodynamic stability and interesting supramolecular chemistry for compounds 1-4. The photoluminescence properties of complexes 1-4 recorded in the solid state at room temperature are also presented. |
| Keywords: | Crystal structures IR spectroscopy Photoluminescent zinc(II) complexes Pyridine-2-amidoxime Zinc(II) complexes |
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