Transfer of heterocyclic carbene ligands from chromium to gold, palladium and platinum

Add time:09/27/2019    Source:sciencedirect.com

The reaction of pentacarbonyl(pyrazolin-3-ylidene)chromium complexes, (2a–c) (R = Ph (a), C6H4NMe2-4 (b); (C5H4)FeCp (c)), with [AuCl(SMe2)], H[AuCl4], [PdCl2(NCPh)2] and [PtCl2(NCPh)2] gives, by transfer of the heterocyclic carbene ligand, new chloro pyrazolin-3-ylidene complexes of gold(I) and gold(III), dichloro bis(pyrazolin-3-ylidene) palladium and dichloro bis(pyrazolin-3-ylidene) platinum in high yield. The chloride ligand in (Fc = (C5H4)FeCp) is readily displaced by trifluoroacetate. The analogous substitution of iodide for the chloride ligands in (M = Pd, Pt) give the corresponding diiodo complexes although in a much slower reaction. In contrast, the reaction of silver trifluoroacetate with affords a binuclear Pd–Ag complex containing two pyrazolin-3-ylidene and three trifluoroacetate ligands two of whom occupy bridging positions between Pd and Ag. The reactions of the pyrazolidin-3-ylidene complex (R = C6H4NMe2-4) with [AuCl(SMe2)] and [PdCl2(NCPh)2] yield chloro pyrazolidin-3-ylidene gold and dichloro bis(pyrazolidin-3-ylidene) palladium complexes. The related dichloro bis(tetrahydropyrimidin-4-ylidene) palladium complex is formed in the reaction of with the palladium complex [PdCl2(NCPh)2]. The solid-state structures of several of these heterocyclic carbene complexes including the structure of the binuclear Pd–Ag complex are established by X-ray structure analyses.

We also recommend Trading Suppliers and Manufacturers of CHROMIUM(III) TRIFLUOROACETATE (cas 16712-29-1). Pls Click Website Link as below: cas 16712-29-1 suppliers

Prev:Infrared and X-ray absorption spectroscopic studies on the mechanism of chromium(III) binding to alfalfa biomass
Next:Factors influencing the formation of 2-hydroxy-6-naphthoic acid from carboxylation of naphthol)