Augusto Cingolani, Effendy, Fabio Marchetti, Claudio Pettinari, Riccardo Pettinari, Brian W. Skelton, Allan H. White
Synthetic, spectroscopic, and single-crystal X-ray studies are reported for several complexes of silver(I) with the N2,O2-bichelating Qpy ligand (HQpy = 1-(2-pyridyl)-3-methyl-4- trifluoroacetylpyrazol-5-one). Direct interaction between HQpy and AgNO3 in methanol, in the presence of NaOCH3, affords derivative Ag(Qpy), showing a polynuclear structure composed of dinuclear building blocks with two different Ag environments and two Q py donors differently connected. By adding neutral ligands such as PR3 (R = Ph, Cy, C6H4-o-CH3, C 6H4-p-F, Bui) to Ag(Qpy), dinuclear Ag(Qpy)(PR3) derivatives have been isolated, containing bridging N2,O-exotridentate Qpy donors spanning a pair of AgPR3 moieties. Reaction of Ag(Qpy)(PPh3) with excess PPh3 produces the mononuclear Ag(Qpy)(PPh 3)2 containing N2-chelate Qpy. Ag(Qpy) interacts with 1,2-bis(diphenylphosphino)ethane (dppe) yielding the derivative Ag(Qpy)-(dppe), having a polynuclear structure in the solid state which is seemingly disrupted in solution, with the formation of two new species, a mononuclear neutral compound and a dinuclear ionic one. By the interaction of Ag(Qpy) with nitrogen donors L (L = imidazole (imH), 1-methylimidazole (Meim), 1-methyl-2-mercaptoimidazole (Hmimt), 1,10-phenanthroline (phen)), mononuclear species Ag(Qpy)(L) have been obtained, where Qpy is coordinated to silver in N 2-chelating mode. Ag(Qpy)(PPh3)2 reacts with SnRCl3 (R = Ph, Bun) affording heterotrimetallic [{(Ph3P)2-AgCl}2SnRCl 3] derivatives.
Dipartimento di Scienze Chimiche, Universita degli Studi di Camerino, 62032 Camerino, via S. Agostino 1, Italy; Department of Chemistry, University of Western Australia, Crawley, WA 6009, Australia; Jurusan Pendidikan Kimia, Universitas Negeri Malang, Malang 65145, Jalan Surabaya 6, Indonesia
