Synthesis and characterization of silver(I) derivatives containing acylpyrazolonate and phosphino ligands: X-ray crystal structures of monomeric [Ag(Q(nPe))(PPh3)(2)] and of dimeric [{Ag(Q(nPe))(PiBu(3))}(2)] (Q(nPe)=1-phenyl-3-methyl-4-tert-butylace

摘要

New silver(I) acylpyrazolonate derivatives [Ag(Q)], [Ag(Q)(PR3)](2) and [Ag(Q)(PR3)(2)] (HQ = 1-R-1-3-methyl-4-R-2(C=O)pyrazol5-one, HQ(Bn) = R-1 = C6H5, R-2 = CH2C6H5; HQ(CHPh2) = R-1 = C6H5, R-2 = CH(C6H5)(2); HQ(nPe) = R-1 = C6H5, R-2 = CH2C(CH3)(3); HQ(tBu) = R-1 = C6H5, R-2 = C(CH3)(3); HQ(fMe) = R-1 = C6H4-p-CF3, R-2 = CF3; HQ(fEt) = R-1 = C6H5, R-2 = CF2CF3; R = Ph or iBu) have been synthesized and characterized in the solid state and solution. The crystal structure of 1-(4-trifluoromethylphenyl)-3-methyl-5pyrazolone, the precursor of proligand HQ(fMe) and of derivatives [Ag(Q(nPe))(PPh3)(2)] and [Ag(Q(nPe))(PiBu(3))(2)] have been investigated. [Ag(Q(nPe))(PPh3)(2)] is a mononuclear compound with a silver atom in a tetrahedrally distorted AgO2P2 environment, whereas [Ag(Q(nPe))(PiBu(3))](2) is a dinuclear compound with two O2N-exotridentate bridging acylpyrazolonate ligands connecting both silver atoms, their coordination environment being completed by a phosphine ligand. (c) 2005 Elsevier B.V. All rights reserved.