Improved Syntheses of Carboxytetrathiafulvalene, Formyltetrathiafulvalene and (Hydroxymethyl)tetrathiafulvalene1: Versatile Building Blocks for New Functionalised Tetrathiafulvalene Derivatives
techniques. Linearopticalproperties and the second‐order nonlinearoptical (NLO) response of these derivatives have been computed by comparing systems 1 a–1 c with the non‐radical analogues (2 a–2 c). Interestingly, an enhanced NLO response is predicted for dyads 1 a–1 c with PTM in the radical form and for compounds with longer vinylene bridges. Calculations confirm the active role the bridge plays
通过将四硫富瓦烯(TTF)电子给体单元通过不同长度的亚乙烯基单元桥接到聚氯三苯甲基(PTM)电子受体基团上,制备了三个共轭的供体-π-受体基团(1a - 1c)。分子内电荷转移对共轭桥的长度的依赖性已经通过不同的电化学和光谱技术进行了分析。通过将系统1 a – 1 c与非自由基类似物(2 a – 2 c)进行比较,可以计算出这些导数的线性光学性质和二阶非线性光学(NLO)响应。有趣的是,对于二元组1a,预计NLO反应增强– 1 c以自由基形式的PTM用于具有较长亚乙烯基桥的化合物。计算证实了桥在供体TTF和受体PTM单元之间进行电子通信方面所起的积极作用。
A convenient one-step synthesis of formyltetrathiafulvalene vinylogs: Building blocks for new NLO materials
A new method for the synthesis of formyltetrathiafulvalene vinylogs in which tetrathiafulvalene (TTF) or a substituted derivative of TTF is metalated with lithium diisopropylamide and then reacted with a vinylogous amide to yield the corresponding short polyenals in a one-pot process is described.
In a first aspect, the present invention relates to a perovskite material comprising negatively charged layers alternated with and neutralized by positively charged layers; the negatively charged layers having a general formula selected from the list consisting of: L
n−1
M
n
X
3n+1
, L
n
M
n
X
3n+2
, and L
n−1
M′
n
X
3n+3
, and the positively charged layers comprising: one or more organic ammonium cations independently selected from monovalent cations Q and divalent cations Q′, or a polyvalent cationic conjugated organic polymer Z, wherein Q, Q′ and Z comprise each a π-conjugated system in which at least 8 and preferably at least 10 atoms participate, L is a monovalent cation, M
n
are n independently selected metal cations averaging a valence of two, M′
n
are n independently selected metal cations averaging a valence equal to 2+2/n, X is a monovalent anion, and n is larger than 1.
conformational features, ground state polarization, and linear and nonlinear optical properties have been determined experimentally and theoretically, and the results are compared to those of tetrathiafulvalene-related derivatives. The newly prepared compounds show close to optimal bondlengthalternation values for maximizing the first molecular hyperpolarizability, and one of them displays the highest
New Chiral Binaphthyl Building Blocks: Synthesis of the First Optically Active Tetrathiafulvalene and 11,11,12,12-Tetracyano-9,10-anthraquinodimethane Dimers
作者:Rafael Gómez、José L. Segura、Nazario Martín
DOI:10.1021/jo0009649
日期:2000.11.1
rotation of the two naphthalene rings, binaphthyl derivatives are ideal candidates to be used as nonplanar spacers between electroactive units in the search for materials with enhanced dimensionality. The electronic absorption spectra of dimers in which the electroactive unit is in conjugation with the naphthalene fragment reveal the presence of intramolecularphotoinducedelectron-transfer process from