In the centrosymmetric title compound, [Ag2(NCS)2(C21H21P)4]·2CH3CN, the Ag atom is coordinated by two phosphine ligands and two bridging thiocyanate ligands in a distorted tetrahedral configuration. The Ag—P bond distances are 2.4615 (7) and 2.5091 (7) Å, while the Ag—N and the Ag—S bond distances are 2.364 (2) and 2.3269 (18) Å, respectively. The crystal structure exhibits C—H...S hydrogen bonds.

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In the title compound, [Rh(C13H16NO)(C18H15P)(CO)]·0.5C3H6O, the Rh atom exhibits a square-planar coordination geometry, being coordinated by the N and O atoms of the bidentate β-diketonato ligand, a P atom from the triphenyl­phosphine unit and a C atom from the carbonyl group. The asymmetric unit also contains a disordered half-mol­ecule, lying about an inversion center, of the acetone solvate. Inter­molecular C—H⋯O hydrogen bonds are observed between a C—H group of the triphenyl­phosphine unit and a carbonyl O atom and between the methyl group of the enamino­ketonato backbone and the solvent O atom. In addition, an intra­molecular inter­action is observed between a C—H group of the triphenyl­phosphine unit and the O atom of the enamino­ketonato ligand.

In the title compound, [Rh(C13H16NO)(C18H15P)(CO)], the coordination geometry of the RhI atom is square-planar, formed by the coordinating N and O atoms of the bidentate enaminoketonate ligand, one C atom from the carbonyl group and a P atom from triphenyl­phosphine. The complex displays a 0.591 (3):0.409 (3) ratio disorder of the phenyl unit of the monoanionic N,O-bidentate ligand. Intra­molecular hydrogen bonding is observed between a C—H group of the triphenyl­phosphine unit and the O atom of the enamino­ketonate ligand.

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Key indicatorsSingle-crystal X-ray study T = 295 K Mean (C-C) = 0.007 Å R factor = 0.038 wR factor = 0.102 Data-to-parameter ratio = 21.3For details of how these key indicators were automatically derived from the article, see

The title enamino ketone, C12H15NO, a derivative of 4-(phenyl­amino)­pent-3-en-2-one, presents a roughly planar [greatest displacement of an atom from the pentenone plane is 0.033 (2) Å] pentenone backbone, enhanced by an intra­molecular N—H⋯O hydrogen bond; the asymmetry in C—C distances in the group suggests the presence of unsaturated bonds. The overall geometry in the free ligand differs significantly from that in other reported compounds, in which it is coordinated to rhodium; this is reflected in the bond distances [the N⋯O distance is significantly increased (0.2 Å) upon coordination to the metal] and the dihedral angle between the benzene ring and the pentenone backbone [49.53 (5)°]. All of the methyl goups are rotationally disordered over two orientations of equal occupancy.

Reaction of silver(I) salts with three equivalents of tri-p-tolylphosphine in CH(3)CN resulted in a series of isomorphous complexes [AgX{P(4-MeC(6)H(4))(3)}(3)] (X = Br, SCN, ClO(4)). These complexes all crystallize in the orthorhombic space group Pna2(1). The complexes with X = Br, SCN are distorted tetrahedral around the silver(I) atom, whereas the ClO(4)(-) complex is distorted trigonal planar around the silver. The new complexes are compared with each other using r.m.s. overlay calculations as well as half-normal probability plot analysis and with the previously reported isomorphous chloride, bromide as well as the non-isomorphous iodide complexes.