کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1336716 979608 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Unsymmetrically substituted triazacyclohexanes and their chromium complexes
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Unsymmetrically substituted triazacyclohexanes and their chromium complexes
چکیده انگلیسی

The unsymmetrically N-substituted N,N′-Ar2-N″-R-1,3,5-triazacyclohexanes 1–4 (Ar = ortho- or para-fluorophenyl, R = n- or iso-propyl) can be obtained in good yields from a one-step condensation reaction with excess amine. Solid state structures of 1–4 resemble closely those of their triaryl-substituted analogues. The condensation reaction to 4 was looked at by detailed NMR investigations and revealed that amine/aniline exchange is occurring in solutions containing free aniline even at ambient conditions setting up an equilibrium between all possible symmetrical and unsymmetrical triazacylcohexanes. Selective crystallisation of 4 from the solution drives the reaction to high yields of 4. Complexes 1–4 react readily with CrCl3 or CrCl3(THF)3 to form the corresponding CrCl3 complexes. The complexes are insoluble in non-polar solvents and decompose under decomplexation in coordinating solvents.

Unsymmetrically substituted alkyl-bis(aryl) triazacyclohexanes were obtained by selective crystallisation from equilibrated mixtures. Reactions of these ligands with chromium trichloride afforded pure, but insoluble (TAC)CrCl3 complexes.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polyhedron - Volume 29, Issue 5, 30 March 2010, Pages 1399–1404
نویسندگان
, , , , ,