کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1325442 1499939 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structure and properties of lithium n-butyl amidinates
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Structure and properties of lithium n-butyl amidinates
چکیده انگلیسی

Lithium n-butyl amidinates (formally lithium salts of N',N-disubstituted amidoimides of pentanoic acid) with various substituents were prepared and characterized in solution by 1H, 7Li, 13C and 15N NMR spectra parameters in C6D6, THF-d8 and Et2O-d10. The characteristic spectral parameters were compared with parent carbodiimides and amidines prepared by hydrolysis, where large solvent effects were described. Five of studied compounds were studied by X-ray diffraction techniques in the solid state. Lithium n-butyl amidinates containing less bulky substituents like isopropyl or cyclohexyl crystallize with Et2O or THF as centrosymmetric dimers with mutually parallel amidinate moieties. The lithium N,N'-bis[2,6-di(propan-2-yl)phenyl]n-butylamidinate crystallizes from Et2O solution as an asymmetric dimer. The first unit is composed by one ligand coordinated to one of lithium atoms. The lithium atom is also coordinated by one of the nitrogen atoms of the second ligand. The second nitrogen atom of the same ligand is coordinated to the second lithium atom which is also connected to the Et2O molecule and the aromatic ring of the ligand in a η3-fashion. The same compound crystallizes from the THF solution as a monomeric bis-tetrahydrofuranate.

The lithium N,N′-disubstituted n-butyl amidinates with various substituents (isopropyl-, cyclohexyl- and 2,6-di(propan-2-yl)phenyl-) were prepared and characterized in solution by 1H, 7Li, 13C and 15N NMR spectral parameters in C6D6, THF-d8 and Et2O-d10. Five of studied compounds were studied by X-ray diffraction techniques in the solid state. Figure optionsDownload as PowerPoint slideHighlights
► The lithium N,N′-disubstituted n-butyl amidinates were prepared.
► The characterization of prepared compounds in solution by 1H, 7Li, 13C and 15N NMR spectra parameters in C6D6, THF-d8 and Et2O-d10.
► Five of studied compounds were studied by X-ray diffraction techniques in the solid state.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Organometallic Chemistry - Volume 696, Issues 11–12, 1–15 June 2011, Pages 2346–2354
نویسندگان
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