共查询到19条相似文献,搜索用时 281 毫秒
1.
四硫富瓦烯及其衍生物是性能优良的电子给体.本文利用Sonogashira反应将吡啶基团连接在四硫富瓦烯单元上,合成了"A-C≡C-TTF-C≡C-A"型四硫富瓦烯共轭体系衍生物4,4′(5′)-二-(4-吡啶乙炔基)-四硫富瓦烯(TTF4N).吸收光谱、电化学和Pb2+配位键合研究表明,三键作为桥基能够有效实现分子内的电荷转移.金属Pb2+离子与吡啶基团的配位能够引起TTF4N的吸收光谱、核磁氢谱和电化学性质的显著变化. 相似文献
2.
3.
4.
5.
6.
四硫富瓦烯(TTF)衍生物的配位组装 总被引:6,自引:0,他引:6
四硫富瓦烯(tetratiafulvalenc,TTF)衍生物和二硫纶(dithiolene)化合行等有机富硫分子作为有机光电磁的功能化合物,一直受到了人们的重视,近年来一类融合了TTF和二硫纶结构的扩展TTF衍生物引起人们很大的兴趣,这类八硫共轭体系具有较好的电子授受特性,展示出潜在的应用价值。有目的地利用它与与金属离子间较强的配位能力对这些化合物进行晶体或分子设计已成为配位化学在富硫有机配合物研究中的一个热点。本文重点介绍这方面的研究的最新进展。主要包括以卤化亚铜基本骨架为基础的四烷基硫取代四硫富瓦烯([(RS)2TTF(SR)2])的配位组装;二烷基硫取代的TTF融合二硫纶离子([(RS)2TTF(S2)]^2-)和TTF融合双二硫纶离子([(S)2TTF(S)]^4-金属配位衍生物的分子设计和空间构筑。通过配位修饰或组装,这类TTF金属衍生物显示了多变的结构,有的已发展具有较好的物理性质。 相似文献
7.
以亚磷酸三乙酯为偶合剂,得到两个吡啶基修饰的四硫富瓦烯衍生物1和2。利用1H NMR、MS和单晶X-衍射对化合物进行表征,化合物1属单斜晶系,空间群P21/c,其晶胞参数为a=0.4261(1)nm,b=1.2291(1)nm,c=2.8556(3)nm,Z=4,V=1.4935(3)nm3,Dc=1.653 g/cm3,F(000)=760,R=0.043,!R=0.0827(I>2σ(I))。化合物1和2的电化学性质表现出TTF体系特有的两对氧化可逆的单电子峰,与其他含吡啶基团的TTF衍生物的电化学性质相类似,是一类新的电子给体。 相似文献
8.
本文合成了7,8,17,18-四溴-5,10,15,20-四苯基-21,23(H)-卟啉(H_2TPPBr_4)及其金属配合物MTPPBr_4[M=Cu(Ⅱ),Ni(Ⅱ),Co(Ⅱ)和Zn(Ⅱ)],测定了它们的可见紫外光谱和循环伏安,用四轨道模型(Four Orbital Model)计算了MTPPBr_4的相对前线轨道,并解释了配合物的可见紫外光谱及电化学性质.测定了NiTPPBr_4的晶体结构,晶体属单斜晶系,空间群为C2/c,a=2.6077(7),b=1.0414(4),c=1.9312(3)nm,β=137.1(7)°,Z=4,最后偏离因子R=0.067,晶体结构直接证明了卟啉亲电溴化反应具有区域选择性,四个溴分布在相对两个吡咯环上. 相似文献
9.
10.
在甲醇钠的作用下,2分子的2,3-二(2'-氰乙基硫基)-6,7-二丁硫基四硫富瓦与2分子的2,6-二(氯甲基)吡啶反应生成四硫富瓦烯-吡啶结构单元的新型环蕃(3)。在离子液中测定了新型环蕃3的电化学性质,并研究了其对金属离子识别的性能。实验结果表明:在离子液中,环蕃中四硫富瓦烯单元更加容易被氧化或还原,而且其紫外吸收也显著增强;同时发现Pb2+对这种新型环蕃化合物的紫外吸收和氧化还原电位的影响最为明显,其对Pb2+有一定的选择性识别功能,Cu2+能够破坏TTF结构单元。 相似文献
11.
用比较力场分析研究了N-亚硝基化合物的结构与致癌活性的关系,考察了网络结构和探针原子对结果的影响.结果表明,立体效应和静电作用场是描述其致癌活性和进行结构性能关系研究的最重要的结构参数。 相似文献
12.
13.
By considering the structures of many salts derived from extended TTF analogues, relationships between the molecular architecture of the donors with their electrochemical properties and their stacking mode in the salts are presented in this critical review. Three categories of donors corresponding to their extension modes have been considered. Firstly, for linearly extended TTFs the crucial role of the spacer in modifying the electrochemical properties and the packing mode in the salts is presented. Secondly, bidimentional extension of the donors obtained by linking several dithiafulvenyl units on a TTF core led to materials with increased dimensionality. Finally, the last class corresponds to the fusion, directly or across a benzene ring, of TTF frameworks. The former are the base of many salts with metallic behaviour. (148 references.). 相似文献
14.
A new tetrathiafulvalene (TTF) derivative possessing Schiff base core with the coumarin moiety has been synthesized and characterized. The crystal structure has been studied, and the electrochemical and spectroscopic properties have also been investigated. Optimized conformation and molecular orbital diagram of the title compound have been calculated with density functional theory (DFT). 相似文献
15.
Puri S Chickos JS Welsh WJ 《Journal of chemical information and computer sciences》2002,42(1):109-116
Three-dimensional quantitative structure--property relationship (3D-QSPR) models have been constructed using comparative molecular field analysis (CoMFA) to correlate the sublimation enthalpies at 298.15 K of a series of polychlorinated biphenyls (PCBs) with their CoMFA-calculated physicochemical properties. Various alignment schemes, such as atom fit, as is, and inertial were employed in this study. Separate CoMFA models were developed using different partial charge formalisms, namely, electrostatic potential (ESP) and Gasteiger-Marsili (GM) charges. Among the four different CoMFA models constructed for sublimation enthalpy (Delta(sub)H(m)(298.15 K)), the model that combined atom fit alignment and ESP charges yielded the greatest self-consistency (r(2) = 0.976) and internal predictive ability (r(cv)(2) = 0.750). This CoMFA model was used to predict Delta(sub)H(m)(298.15 K) of PCBs for which the corresponding experimental values are unavailable in the literature. 相似文献
16.
The synthesis and electrochemical properties of five novel organosulfur electron donors containing two to four TTF nuclei are reported. The structures have been assigned by 1H NMR spectroscopy, infrared spectrometry and mass spectra. Cyclic voltammetry (CV) studies show that the multi-TTFs display nearly ideal redox behavior for the TTF system with no distinct interaction between the TTF units. 相似文献
17.
Trippé G Le Derf F Lyskawa J Mazari M Roncali J Gorgues A Levillain E Sallé M 《Chemistry (Weinheim an der Bergstrasse, Germany)》2004,10(24):6497-6509
A crown-tetrathiafulvalene electroactive receptor has been covalently linked to electropolymerizable pyrrole or 3,4-ethylenedioxythiophene monomers. The synthetic route to the monofonctionalized tetrathiafulvalene (TTF) ligand has been optimized. Two derivatives of pyrrole (N- and 3-substituted) were synthesized. The various substituted monomers have been electropolymerized to produce polypyrrole (PP) and poly(ethylenedioxothiophene) (PEDOT) films bearing the electroactive TTF moiety. The electroactivity of the polymer films is efficiently controlled by the well-defined two-step redox behavior of the TTF unit. In the case of PEDOT, an alternative post-polymerization derivatization strategy has been used, involving the grafting of the crown-TTF ligand on the previously grown PEDOT backbone. Though chemical derivatization is realized under heterogeneous conditions, in the bulk of the film, this strategy proved to be particularly efficient. These electrodes constitute the first examples of conducting polymer-based modified electrodes incorporating a TTF electrochemical probe, able to interact with a guest ion, such as Ba2+. The cation recognition properties of these various electrodes have been analyzed by cyclic voltammetry and their electroactivity in water as well as their regeneration capability have been investigated. 相似文献
18.
[structure: see text] The synthesis, theoretical calculations, and crystallographic and electrochemical properties of fused perpendicular tetrathiafulvalene (TTF) dimers incorporating both a TTF unit and a quinonoid pi-extended TTF are described as a new strategy for obtaining pi-extended, rigidified, and sulfur-rich analogues of TTF. 相似文献
19.
Terkia-Derdra N Andreu R Salle M Levillain E Orduna J Garin J Orti E Viruela R Pou-Amerigo R Sahraoui B Gorgues A Favard JF Riou A 《Chemistry (Weinheim an der Bergstrasse, Germany)》2000,6(7):1199-1213
A series of extended tetrathiafulvalene (TTF) derivatives bearing one or two 1,4-dithiafulven-6-yl substitutents has been prepared. The new compounds present remarkable electrochemical singularities compared with other TTF derivatives, which are strongly affected by the nature of the substitution on the lateral heterocycle(s). This unusual electrochemical behaviour follows a square-scheme sequence and is attributed to structural changes upon oxidation of the pi-donating molecules. Digital simulations of the electrochemical data have been used to reach the values of the kinetic and thermodynamic constants involved in the square scheme. Theoretical calculations establish an important contribution of a highly delocalised resonant form involving a tetravalent sulphur in oxidised species, which could justify the occurrence of an electrochemical behaviour distinct from that of TTF. Finally, third-order susceptibilities chi 3 of two of these systems, for which electron-donating and electron-withdrawing substituents coexist and are conjugated through the TTF pi system, are given. 相似文献