Can. J. Chem. 66, 3176 (1988). Acetylide complexes of formula [[err-BuC-CAu(RrPCHIPRz)], R = CH, (60) and C6Hs (6b), have been prepared, and characterized by spectroscopic methods. These complexes undergo a fluxional process involving a three-coordinate Au(l) centre. [Traduit par la revue]
Electrophilic gold reagents add to the PtPt bond of 1 to give trinuclear cluster compounds. From the crystal structure a 3c2e bonding can be concluded for the Pt2‐Au group in 2. In analogous reactions with silver or copper electrophiles, the ligand sphere is attacked, and not the Pt‐Pt bond.
85% phosphoric acid; and 13C, internal tetramethylsilane. The high-frequency-positive convention, recommended by IUPAC, has been used in reporting all chemical shifts. Line shape analyses of 31P NMR spectra were performed with an iterative analysis program, dnmrs,12,13 on a VAX/VMS computer. Infrared spectra (resolution 2 cm'1) were recorded from mineral oil mulls or dichloromethane solutions with a Perkin-Elmer 180 spectrometer. Electronic spectra were recorded on a Hewlett-Packard 8450A.X-ray Data Collection, Solution, and Refinement for [Rh2Pd(CO)2(ii-Cl)CI2(M-dpma)2IBPh4]-2CH2Cl2-(C2H5)20. Well-formed red parallelepipeds were grown by slow diffusion of diethyl ether into a dichloromethane solution of the complex. The crystals were rapidly taken from the diffusion tube and covered with epoxy resin to reduce loss of solvent from the crystal. Crystal data, data collection procedures, and refinement of the structure are summarized in Table VI. The lattice was found to be monoclinic by standard procedures using the software associated with the Syntex P2! diffractometer. The data were corrected for Lorentz and polarization effects.The structure was solved by locating the two rhodium and palladium atoms by using the Patterson method (fmap 8 routine of shelxtl, version 4, 1984, Nicolet Instrument Corp., Madison, WI). Other atoms were located from successive difference Fourier maps. Final cycles of refinement were made with anisotropic thermal parameters for iridium, rhodium, arsenic, phosphorus, and the five chlorine atoms, and isotropic thermal parameters for all remaining atoms. Hydrogen atoms were refined by using a riding model in which an idealized C-H vector of 0.96-Á length is recalculated with each cycle of refinement. Isotropic (12)
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