New packing type of the conducting layer in the structure of the organic semiconductor (ET)6[Pb3Br9PhClMe2CO], the first ET-based lead-containing salt

A new organic semiconductor, (ET)₆[Pb₃Br₉PhClMe₂CO], which is the first radical cation salt based on bis(ethylenedithio)tetrathiafulvalene (ET) with a lead-containing anion, has been synthesized. The composition and crystal and molecular structure of this compound have been established by X-ray structural analysis. The crystal structure can be described as a layer structure. A new type of packing of ET radical cations has been found in the conducting layer. The anionic layer consists of [Pb₃Br₉ ^3–] _n polymeric anions and chlorobenzene and acetone solvate molecules bonded to polymeric anions through Br...H-C hydrogen bonds.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 910–916, May, 1995.This work was financially supported by the International Science Foundation (Grant RE1 000), the Scientific Council on the Problems of High-Temperature Superconductivity (Project No. 93030), and the Russian Foundation for Basic Research (Project No. 94-03-09950).     

Imidazole‐Annulated Tetrathiafulvalenes Exhibiting pH‐Tuneable Intramolecular Charge Transfer and Redox Properties

CT or not CT : Three imidazole‐annulated TTF derivatives 1 – 3 have been prepared and fully characterized. The influence of the TTF unit on the pK_a values of the acceptor units as determined by photometric titration has been discussed. The results reported here are part of an initial exploratory study to generate a range of well‐defined coordination networks.

     

Synthesis and Electroconductive Properties of Radical Salts Derived from Tetrathiafulvalene Dimers

Palladium(II)- or copper(II)-catalyzed homo-coupling reaction of either trimethylstannyltetrathiafulvalene or tetrathiafulvalenylzinc chloride produces symmetrical bitetrathiafulvalenes (bi-TTFs) in good yields, whereas palladium(0)-catalyzed cross-coupling reaction of tetrathiafulvalenylzinc chloride with 4-iodotetrathiafulvalenes leads to the corresponding unsymmetrically substituted bi-TTFs in moderate-to-high yields. The X-ray analysis of bi-TTF derivatives showed planar structures, and the cyclic voltammetry suggested that bi-TTFs have good donor ability comparable to that of BEDT-TTF. The symmetrical bi-TTFs formed the corresponding CT-complexes and cation radical salts. These CT-complexes and radical salts were found to be metallic or semiconducting, reflecting the effect of stoichiometry control in the dimeric TTF system. The X-ray structures of two cation radical salts revealed a unique stacking, and the precise conducting path in BEDO-bi-TTF·ClO₄ was discussed on the basis of MO calculations.     

4,5-二腈基乙硫基-1,3-二硫代环戊烯-2-硫酮及其Ag(Ⅰ)配合物的合成和晶体结构

由二硫化碳、二甲基甲酰胺(DMF)、金属钠、3-溴丙腈和三氟甲基磺酸银等合成了4,5-二腈基乙硫基-1,3-二硫代环戊烯-2-硫酮(bcdt)(1)及其Ag(Ⅰ)配位聚合物[Ag4(bcdt)4(CF3SO3)2]·(CF3SO3)2·acetone(2),并使用溶剂扩散法得到了它们的单晶.通过元素分析、红外光谱和X射线单晶衍射分析等对配体和配合物的组成和结构进行了表征.X射线单晶衍射分析表明:配体1通过S…S相互作用形成了一维的链状结构;配位聚合物2则借助配位键构建出一个新颖的三维网络结构,分子内存在着广泛的面对面和肩并肩的S…S相互作用.配体1是绝缘体,而配合物2室温电导率σRT＝6.46×10-8S·cm-1.     

富勒烯C60硫桥键联四硫富瓦烯衍生物的理论研究

利用半经验AM1法研究了富勒烯C₆₀硫桥键联四硫富瓦烯衍生物和富勒烯C₆₀键联四硫富瓦烯衍生物的几何构型,电子结构.计算结果显示,富勒烯C₆₀硫桥键联四硫富瓦烯衍生物的四硫富瓦烯(TTF)平面与C₆₀发生作用,使其弯曲的程度比富勒烯C₆₀键联四硫富瓦烯衍生物的大,从而形成一种独特的四硫富瓦烯(TTF)平面半包裹C₆₀的空间构型的D-A体系.这很可能是由于C-S单键的灵活性造成的.而且它们的HOMO轨道主要分布在四硫富瓦烯(TTF)部分,而LUMO轨道则主要分布在C₆₀上.预测了富勒烯C₆₀硫桥键联四硫富瓦烯衍生物很有可能在激发态下产生更长寿命的电荷分离态.     

氧化作用控制“四硫富瓦烯-蒽”二元体系的荧光开关行为

利用Wittig反应将高荧光量子产率的蒽基团通过双键连接在四硫富瓦烯单元上,合成了二元共轭体系化合物TTFan.在氧化作用的控制下,四硫富瓦烯单元的给电子能力降低,TTFan的荧光发射强度增大至原来的十几倍,实现了荧光的“off-on”过程.     

富瓦烯衍生物修饰NiS微粒的制备及性质

硫化镍;表面修饰;富瓦烯衍生物修饰NiS微粒的制备及性质     

新型I型五聚四硫富瓦烯衍生物的合成和性质

利用2,3-二(2'-氰乙基硫基)-6,7-二烷硫基四硫富瓦烯在甲醇钠的作用下消除一个保护基团生成四硫富瓦烯单钠盐,与1,4-二(氯甲基)苯反应, 形成单桥-双(四硫富瓦烯)衍生物, 生成的单桥-双(四硫富瓦烯)衍生物再次在甲醇钠的作用下消除剩下的保护基团, 形成单桥-双(四硫富瓦烯)衍生物二钠盐, 最后与四(3'-碘丙硫基)四硫富瓦烯反应形成新型I型五聚TTF衍生物, 并通过循环伏安法和化学氧化法分别对其氧化还原性质和紫外光谱进行了研究.