کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1327498 977485 2009 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
New structural motifs of silver and gold complexes of pyridine-functionalized benzimidazolylidene ligands
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
New structural motifs of silver and gold complexes of pyridine-functionalized benzimidazolylidene ligands
چکیده انگلیسی

Reaction of 1,3-bis(picolyl)benzimidazolium chloride ([HL1]Cl) with Ag2O yields mononuclear complex [Ag(L1)Cl] (2), further reaction of 2 with Au(Et2S)Cl afforded [Au(L1)Cl] (3). Treatment of 2 with AgBF4 gave the trinuclear silver cluster [Ag3(L1)3](BF4)3 (4), whereas the digold complex [Au2(L1)2](BF4)2 (5) can be easily obtained from the carbene transfer reaction of 4 with Au(Et2S)Cl. A one-dimensional coordination polymer {[Ag(L2)](BF4) · CH3CN}n (8) was isolated from the reaction of [Ag(L2)Cl] (7, L2 = 1-benzyl-3-picolylbenzimidazolylidene) with additional Ag+ in good yield. The dinuclear [Ag2(L3)2](PF6)2 (12, L3 = 1,4-di(N-benzylbenzimidazolylidene)but-2-yne) is a 18-membered macrocycle. All these complexes have been structurally characterized. Complex 2 shows a dimeric structure because of intermolecular Ag⋯Cl interactions. Complex 4 consists of a triangular Ag3 ring with very short Ag–Ag contacts 2.777(1) Å, the Au–Au distance in 5 is 3.206(2) Å showing very weak Au–Au interaction and the macrocyclic cations in 12 are aligned one above another to form channels filled with hexafluorophosphate anions. The complexes 2–5, 8, and 12 are intensely luminescent upon irradiation of uv light, and their emission properties are briefly described.

A few mono-, di-, trinuclear, and polymeric silver and gold complexes containing pyridine-functionalized N-heterocyclic carbenes have been obtained from the reactions of the corresponding imidazolium salts and Ag2O or the carbene transfer reactions for gold complexes. The complexes are intensely luminescent upon irradiation of UV light.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Organometallic Chemistry - Volume 694, Issue 15, 1 July 2009, Pages 2359–2367
نویسندگان
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