Redox-active proligands from the direct connection of 1,3-dithiol-2-one to tetrathiafulvalene (TTF): syntheses, characterizations and metal complexation
作者:Franck Camerel、Olivier Jeannin、Gilles Yzambart、Bruno Fabre、Dominique Lorcy、Marc Fourmigué
DOI:10.1039/c3nj41097h
日期:——
In the search for novel tetrathiafulvalene-substituted dithiolene ligands, two tetrathiafulvalene (TTF) molecules directly connected to 1,3-dithiol-2-one fragments have been synthesized and characterized by single crystal X-ray diffraction, electrochemical and spectroscopic analyses. TTF1 was obtained, in moderate yield, by the cross-coupling of 4,5-bis(methylthio)-1,3-dithiole-2-one with 4,4′-bis(1,3-dithiole-2-one) in triethylphosphite, whereas for TTF2, the 1,3-dithiol-2-one fragment was introduced, in high yield, by an original reaction of the alkyne group of an ethynyl TTF (Me3TTF–CCH) with xanthogen in the presence of a radical initiator. Opening of the 1,3-dithiol-2-one fragments with sodium methanolate leads to the formation of two new 1,2-dithiolate ligands functionalized with redox-active TTF moieties, which can efficiently coordinate metals. As an illustration, two original heteroleptic bis(cyclopentadienyl)dithiolene titanium complexes were isolated and characterized.
在寻找新型四硫富瓦烯取代二硫烯配体的过程中,我们合成了两种直接连接四硫富瓦烯(TTF)分子与1,3-二硫杂环戊烯-2-酮片段的化合物,并通过单晶X射线衍射、电化学和光谱分析进行了表征。TTF1是通过4,5-双(甲硫基)-1,3-二硫杂环戊烯-2-酮与4,4′-双(1,3-二硫杂环戊烯-2-酮)在三乙基亚磷酸酯中的交叉偶联反应制备的,产率中等;而TTF2则是通过一种原始的反应,在自由基引发剂存在下,将乙炔基TTF(Me3TTF–CCH)的炔基与黄原酸酯反应引入1,3-二硫杂环戊烯-2-酮片段,产率较高。用甲醇钠打开1,3-二硫杂环戊烯-2-酮片段,形成了两种新的含氧化还原活性TTF基团的1,2-二硫醇配体,这些配体能够有效地与金属配位。作为示例,我们分离并表征了两种新颖的杂配体双(环戊二烯基)二硫烯钛配合物。