Unsymmetrical and highly-conjugated tetrathiafulvalene and selenatrithiafulvalene derivatives: synthesis and reactions of novel heterocyclic Wittig–Horner reagents
作者:Martin R. Bryce、Adrian J. Moore、Dominique Lorcy、Ajaib S. Dhindsa、Albert Robert
DOI:10.1039/c39900000470
日期:——
Novel 1,3-dithiole and 1-selena-3-thiole Wittig–Homer reagents have been developed and used in the efficient synthesis of a range of new, unsymmetricaltetrathiafulvalene and selenatrithiafulvalenederivatives (6)–(10) and (16); cyclic voltammetry establishes that these molecules are efficient π-donors.
1O2 generation at the Zn–porphyrin centers. The PdII‐based prism is a particularly robust photosensitizer, whereas the CuII self‐assembled prism is a dormant photosensitizer that could be switched to a ON state upon disassembly of the suprastructure. Furthermore, the well‐defined cavity within the prisms allowed encapsulation of pyridine‐based ligands and fullerene derivatives, which led to a remarkable
我们证明了在协调驱动的自组装棱镜中使用界面锌卟啉作为结构合成子来生产具有可调性质的笼状单线态氧(1 O 2)光敏剂的好处。特别是,我们描述了基于钯和铜的超分子胶囊的光敏性和发射特性,并证明了在这些离散的自组装棱镜中桥接金属节点的性质强烈影响了锌卟啉中心的1 O 2生成。基于Pd II的棱镜是一种特别坚固的光敏剂,而Cu II自组装棱镜是一种休眠型光敏剂,在拆卸上部结构时可以将其切换为“开”状态。此外,棱柱内明确界定的空腔允许封装吡啶基配体和富勒烯衍生物,这导致1 O 2产量的显着客体调节。
Donor–π-Acceptor Species Derived from Functionalised 1,3-Dithiol-2-ylidene Anthracene Donor Units Exhibiting Photoinduced Electron Transfer Properties: Spectroscopic, Electrochemical, X-Ray Crystallographic and Theoretical Studies
作者:Andrei S. Batsanov、Martin R. Bryce、Malcolm A. Coffin、Andrew Green、Ronald E. Hester、Judith A. K. Howard、Igor K. Lednev、Nazario Martín、Adrian J. Moore、John N. Moore、Enrique Ortí、Luis Sánchez、María Savirón、Pedro M. Viruela、Rafael Viruela、Tian-Qing Ye
Novel single-component donor- acceptor species 7 and 8 have been synthesised from substituted 10-(1,3-dithiol-2-ylidene)anthracen-9(10H)one 6 by reaction with Lehnert's reagent and with N,N'-bis(trimethylsilyl)carbodiimide, respectively. The steady-state UV/visible spectra of these systems contain a solvatochromic band arising from intramolecular charge transfer between the donor and acceptor groups Ultrafast time-resolved spectroscopy shows that the excited state formed on photolysis has a lifetime of 170-400 ps, which depends strongly on solvent polarity. Cyclic voltammetric data indicate the presence of two active redox centres in the molecules: electrochemical oxidation and reduction form cation radicals and anion radicals, respectively. The X-ray crystal structures of compounds 6a, 7b and 11a reveal that all three molecules are severely distorted from planarity, with the central ring of the anthracenediylidene moiety adopting a boat conformation. The molecular structures of 6, 7 and 11 have been investigated theoretically at the ab initio 6-31G* level. Calculated geometries are in good agreement with the X-ray data and clearly show the decrease in steric hindrance along the series 11>7>8>6. The calculations support the intramolecular charge-transfer nature of the lowest energy absorption band observed for 6, 7 and 8, and explain the origin of the redox properties for these compounds. The optimised geometries of the cation radical, anion radical and dianion of compound 7 illustrate the structural changes induced by the charging process. For the dianion, the steric interactions are alleviated by rotation of the acceptor dicyanomethylene unit, but the presence of the donor dithiole group hinders the achievement of a fully aromatic planar structure for the central anthracene skeleton.
BRYCE, MARTIN R.;MOORE, ADRIAN J.;LORCY, DOMINIQUE;DHINDSA, AJAIB S.;ROBE+, J. CHEM. SOC. CHEM. COMMUN.,(1990) N, C. 470-472
作者:BRYCE, MARTIN R.、MOORE, ADRIAN J.、LORCY, DOMINIQUE、DHINDSA, AJAIB S.、ROBE+