کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1335932 1500239 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The versatile chemistry of niobium pentachloride with aliphatic amines: Aminolysis, metal reduction and C–H activation
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
The versatile chemistry of niobium pentachloride with aliphatic amines: Aminolysis, metal reduction and C–H activation
چکیده انگلیسی

The reactions of NbCl5 with limited amounts (1–2 molar equivalents) of a series of primary, secondary and tertiary amines were investigated in dichloromethane as solvent. The 1:1 reaction of NbCl5 with NHEt2 cleanly afforded an equimolar mixture of [NbCl4(NEt2)]2, 1, and [NH2Et2][NbCl6], 2a; the former product constitutes the first example of structurally characterized Nb(V) chlorido–amido complex. The ammonium salts [NH3nPr][NbCl6], 2b, and [NH2iPr2][NbCl6], 2c, were isolated in 20–30% yields from the 1:1 reactions of NbCl5 with NH2nPr and NHiPr2, respectively. Cα–H bond activation and Nb(V) to Nb(IV) reduction took place in the reactions of NbCl5 with NR3 (R = Bz, Et; Bz = CH2Ph). The iminium salt [(PhCH2)2NCHPh][NbCl6], 3, and the ammonium ion [NH(CH2Ph)3]+ were identified as the prevalent species generated from the 1:1 NbCl5/NBz3 interaction. [NHEt3][NbCl6], 4, and [NHEt3]2[NbCl6], 5, were isolated in moderate yields from, respectively, the 1:1 and 1:2 molar reactions of NbCl5 with NEt3. The solid state structures of 1, 2a, 3, 4 and 5 were ascertained by single crystal X-ray studies.

The first structurally characterized Nb(V) chlorido amido complex has been prepared by the 1:1 reaction of NbCl5 with NHEt2. Evidences for metal reduction and C–H activation have been collected for the reactions of NbCl5 with trialkylamines.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polyhedron - Volume 100, 4 November 2015, Pages 192–198
نویسندگان
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