کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1327276 977471 2007 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Transfer of heterocyclic carbene ligands from chromium to gold, palladium and platinum
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Transfer of heterocyclic carbene ligands from chromium to gold, palladium and platinum
چکیده انگلیسی

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.

The heterocyclic carbene ligand in pentacarbonyl(pyrazolin-3-ylidene)chromium complexes is readily transferable to gold, palladium and platinum thus affording pyrazolin-3-ylidene gold complexes and bis(pyrazolin-3-ylidene)palladium and -platinum complexes in high yield.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Organometallic Chemistry - Volume 692, Issue 14, 15 June 2007, Pages 3005–3018
نویسندگان
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