کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1322182 1499866 2015 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Copper(I) complexes of chelating imidazolo- and imidazolio-diphosphines
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Copper(I) complexes of chelating imidazolo- and imidazolio-diphosphines
چکیده انگلیسی

Resumption of the preparation of the known imidazolo-diphosphine BIPHIMIP allowed the resolution of its X-ray-crystal structure along with that of an imidazolo-triphosphine side-product. BIPHIMIP is then shown to undergo selective N-methylation to the corresponding imidazolio-diphosphine (BIPHIMIOP), also characterized by crystallography. In spite of weakly donating characters, both the neutral and cationic diphosphines are found to react with CuI to afford stable Cu(I) complexes occurring as centro-symmetric dinuclear species in the crystal state. Mild nucleophilic treatment of the electron-poor BIPHIMIOP complex with [Et4N][Cl] is shown to trigger dephosphinylation to the corresponding electron-rich NHC-phosphine complex, thus demonstrating the dative nature of the [N2C–PPh2]+ bond (in a NHC–>phosphenium adduct) and the C:–>P:–>Cu ternary character of the BIPHIMIOP-Cu coordination motif.

Chelation of Cu(I) centers by the electron-poor neutral BIPHIMIP and cationic BIPHIMIOP diphosphines is described, and the dicationic complex is shown to undergo dephosphinylation to the corresponding neutral electron-rich NHC-phosphine complex.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Organometallic Chemistry - Volume 776, 15 January 2015, Pages 149–152
نویسندگان
, , , , ,