کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1326368 977427 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Subtle role of counteranions in molecular construction: Structures and properties of novel Cu(II) coordination complexes with bis-(1-benzoimidazolymethylene)-(2,5-thiadiazoly)-disulfide
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Subtle role of counteranions in molecular construction: Structures and properties of novel Cu(II) coordination complexes with bis-(1-benzoimidazolymethylene)-(2,5-thiadiazoly)-disulfide
چکیده انگلیسی

The direct self-assembly of bis-(1-benzoimidazolymethylene)-(2,5-thiadiazoly)-disulfide (L) with CuSO4, Cu(NO3)2 and CuCl2 affords three novel supramolecular complexes: 1-D ladder-like chain complex {[Cu(SO4)(L)] · (CH3OH)}n (1), dimer complexes {[Cu(L)(CH3O)]2(NO3)2} · 2H2O (2) and [Cu(L)(Cl)(N3)]2 · 2CH3OH (3). The nature of the anions is the underlying reason behind the differences in the structures of this series of complexes. Furthermore, utilizing the coordinatively unsaturated complexes 2 and 3 as precursor complexes, two new derivative complexes [Cu(L)(NCS)(CH3O)]2 · 2CH3OH (2A) and [Cu(L)(ClO4)(N3)]2 · 2CH3OH (3A) are obtained by the addition and exchange reactions of complexes 2 and 3 with anions. X-ray crystallographic analysis shows that the two derivatives retain the skeletons of their precursor complexes, and the anions with the stronger coordination capacity only bind to the active position of precursor complexes. In addition, different from the obvious effects on the structures in the direct self-assembly of the metal and ligand, the change of counteranions has no great impact on the structures in the anion exchange reactions. We also study the catalytic activities of the complexes 2, 2A, 3, and 3A, which have similar skeletons, for the oxidative coupling polymerization of 2,6-dimethylphenol (DMP). And we find that the introductions of different coordination counterions produce significant impacts on the catalytic properties of these complexes.

Five Cu(II) complexes are synthesized by two self-assembly methods, the direct self-assembly of the metal and ligand, and the anion exchange reaction of precursor complex. Of the five complexes, selecting four having similar structural skeletons as catalysts, the catalysis process of the oxidative coupling of DMP has been explored.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Organometallic Chemistry - Volume 694, Issue 18, 15 August 2009, Pages 2875–2882
نویسندگان
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