کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1323598 977296 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
[(TMEDA)Co(NO)2][BPh4]: A versatile synthetic entry point to four and five coordinate {Co(NO)2}10 complexes
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
[(TMEDA)Co(NO)2][BPh4]: A versatile synthetic entry point to four and five coordinate {Co(NO)2}10 complexes
چکیده انگلیسی

[(TMEDA)Co(NO)2][BPh4] reacts with Group 1 salts of various monoanionic ligands to yield four and five coordinate {Co(NO)2}10 complexes. The synthesis of the four coordinate complex of the form [{LX}Co(NO)2] via salt-metathesis reactions of [(TMEDA)Co(NO)2][BPh4] with [{ArNC(Me)CHC(Me)NAr}Li(OEt2)] (Ar = 2,6-di-iso-propylphenyl) is reported. In addition [(TMEDA)Co(NO)2][BPh4] reacts with either KTp∗ or a suite of cyclopentadienyllithium and cyclopentadienylsodium reagents, to generate the corresponding five coordinate [{L2X}Co(NO)2] complexes ({L2X = C5H5, MeC5H4, Cp∗, tBuC5H4, Ph2CHC5H4, Me3SiC5H4, tBuMe2SiC5H4, iPr3SiC5H4, 1,3-(iPr3Si)2C5H3 and Tp∗). In support of existing precedent, the four coordinate complex is a thermally robust and readily isolable species while five coordinate complexes are thermally unstable transient intermediates that may either undergo dissociation of an NO ligand or be trapped by alkenes to form the corresponding metal dinitrosoalkane complexes. These reactions demonstrate that [(TMEDA)Co(NO)2][BPh4] provides a versatile synthetic entry point to cobalt dinitrosyl complexes and obviates the need for the repeated use of nitric oxide in the preparation of dinitrosoalkane complexes of cobalt.

Figure optionsDownload as PowerPoint slideHighlights
► [(TMEDA)Co(NO)2][BPh4] as a precursor for various {Co(NO)2}10 complexes.
► Reaction with β-diketiminate ligand generates the 4-coordinate complex (BDI)Co(NO)2.
► Reaction with MTp∗ and MCp generates the 5-coordinate complexes {L2X}Co(NO)2.
► 4-coordinate complexes are isolable; 5-coordinate complexes readily lose 1 equiv NO.
► Alkene trapping of 5-coordinate transients yields isolable dinitrosoalkane complexes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Organometallic Chemistry - Volume 696, Issue 25, 15 December 2011, Pages 3974–3981
نویسندگان
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