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Roca, Sunčica; Vikić-Topić, Dražen; Plavec, Janez; Šket, Primož; Mihalić, Zlatko; Matković-Čalogović, Dubravka; Popović, Zora
Polyhedron, 04/2016, Letnik: 109Journal Article
Silver(I) complexes Ag(NO3)(3-Xpy)2, X=Cl (1), Br (2), I (3), were prepared and characterized by IR and NMR spectroscopy, by mass spectrometry and by powder and single-crystal X-ray analysis. Single point DFT calculations, followed by NPA and QTAIM analyses, were performed. In vitro tests of all complexes shown antibacterial activity. Display omitted Three 1:2 complexes of Ag(I) nitrate with 3-halopyridine of the general formula Ag(NO3)(3-Xpy)2, X=Cl (1), Br (2), I (3), were prepared and characterized by elemental analysis, IR spectroscopy, mass spectrometry, multinuclear NMR spectroscopy in solution (1H, 13C, 15N, 109Ag) and in the solid state (13C, 15N), by powder and by single-crystal (1 and 3) X-ray analysis. Data showed that in complexes 1 and 3 the Ag atoms are coordinated by two halopyridine ligands through the N atoms and by various number of nitrate groups resulting in three-, four- and five-coordinated Ag atoms. Single point DFT calculations, followed by NPA and QTAIM analyses, were performed to understand the nature of bonding in the crystal structures. Three types of interactions were detected: coordinate Ag–N bonding, weaker Ag–O ionic bonding and in 3 weak Ag–Ag closed-shell bonding with a small covalent contribution. In vitro tests of all complexes gave better antibacterial activity when tested against Gram-negative than Gram-positive strains.
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