Augusto Cingolani, Effendy, Fabio Marchetti, Claudio Pettinari, Riccardo Pettinari, Brian W Skelton, Allan H White
Silver(I) acylpyrazolonate derivatives of formula [Ag(Q)(R3P)]2 and [Ag(Q)(R3P)2], (QH = 1-phenyl-3-methyl-4-R′(C=O)-pyrazol-5-one; QOH, R′ = furane; QSH, R′ = thiophene; R = Ph, Cy, o-tol), have been synthesised and characterised, both in the solid state and in solution. The derivatives [Ag(Q)(R3P)]2 contain dinuclear AgO2NP units with the acylpyrazolonate coordinating in a bridging O,O′-Q-N fashion. The [Ag(Q)(R3P)2] are tetrahedral species, with the distortion from ideal geometry increasing with the bulk of the phosphine. The [Ag(Q)(R3P)2] derivatives are fluxional in chloroform solution when R3P is sterically hindered (R = Cy or o-tol), dissociating partially to the [Ag(Q)(R3P)] fragment and free R3P. [Ag(QS)(Ph3P)]2 reacts with 1-methyl-2-mercaptoimidazole (Hmimt) affording the compound [Ag(Hmimt)(Ph3P)(QS)] and [Ag(QO)(Ph3P)]2 reacts with 1-methyl-imidazole (Meim) affording the compound [Ag(Meim)(Ph3P)(QO)], whereas [Ag(QS)(Ph3P)]2 reacts with 1,10-phenanthroline (phen), affording the compound [Ag(phen)(Ph3P)](QS). Finally [Ag(QS)(Ph3P)2] reacts with phen producing the ionic species [Ag(phen)(Ph3P)2](QS). © 2002 Elsevier Science B.V. All rights reserved.
Dipartimento di Scienze Chimiche, Università degli Studi di Camerino, Macerata, via S. Agostino 1, 62032 Camerino, Italy; Department of Chemistry, University of Western Australia, Western Australia 6009, Australia; Jurusan Pendidikan Kimia, FMIPA Universitas Negeri Malang, Malang 65145, Jalan Surabaya 6, Indonesia
