Mono- and bis(tetrathiafulvaleno)hexadehydro[12]annulenesElectronic supplementary information (ESI) available: cyclic voltammograms of the annulenes 1 and 2. See http://www.rsc.org/suppdata/cc/b4/b407200f/
Interactions between tetrathiafulvalene units in dimeric structures – the influence of cyclic cores
作者:Huixin Jiang、Virginia Mazzanti、Christian R Parker、Søren Lindbæk Broman、Jens Heide Wallberg、Karol Lušpai、Adam Brincko、Henrik G Kjaergaard、Anders Kadziola、Peter Rapta、Ole Hammerich、Mogens Brøndsted Nielsen
DOI:10.3762/bjoc.11.104
日期:——
A selection of cyclic and acyclic acetylenicscaffolds bearing two tetrathiafulvalene (TTF) units was prepared by different metal-catalyzed coupling reactions. The bridge separating the two TTF units was systematically changed from linearly conjugated ethyne, butadiyne and tetraethynylethene (trans-substituted) units to a cross-conjugated tetraethynylethene unit, placed in either acyclic or cyclic
A series of three structurally related mono-, bidentate and macrocyclic TTF-pyridine hosts were prepared and titrated with several metal cations including Ag+ and Pb2+ and studied using NMR- and UV-vis spectroscopy and cyclic voltammetry. For Ag+, we found an eightfold increase in binding affinity between the bidentate and macrocyclic host and conversely, for Pb2+, a 100-fold drop. Density functional theory (DFT) calculations support the increased binding affinity for Ag+ is due to an N...N distance for the uncomplexed macrocycle very much suited for binding of Ag+ but being too small for Pb2+. The bidentate host, on the other hand, is of a suitable size for Pb2+. (C) 2016 Elsevier Ltd. All rights reserved.
Synthesis and Properties of Thienylene-Ethynylene-Tetrathiafulvalene Oligomers
A series of thienylene-ethynylene-tetrathiafulvalene oligomers 1-6 have been synthesized by the Sonogashira reaction of iodo-tetrathiafulvalene derivatives with thienylethynes. The X-ray structure of 4,5-bis(2-thienylethynyl)tetrathiafulvalene (1b) revealed a planar structure of the molecule. The electronic spectra of neutral oligomers 1-6 suggest a partial intramolecular charge transfer between the TTF and thienylethyne units. The cyclic voltammetric measurements of 1-4 showed multi-redox processes.
Synthesis and Electrochromic Properties of Bis(2-tetrathiafulvalenylethynylphenyl)ethynes
Bis(2-tetrathiafulvalenylethynylphenyl)ethynes 1a and 1b have been synthesized by the Sonogashira coupling reaction of 4-iodotetrathiafulvalenes with bis(2-ethynylphenyl)ethyne. The dimeric TTFs 1a and 1b form an open-chain anti conformation in the neutral and tetracation states, whereas la and 1b form a helical syn conformation in the mono- and dication states owing to their face-to-face interaction between the two TTF units. Such conformational changes lead to unique electrochromic and on-off switching properties of 1a and 1b in UV-vis-NIR spectra.
The Gilded Edge in Acetylenic Scaffolding: Pd-Catalyzed Cross-Coupling Reactions of Phosphine–Gold(I) Oligoynyl Complexes
作者:Virginia Mazzanti、Huixin Jiang、Henrik Gotfredsen、Thorbjørn J. Morsing、Christian R. Parker、Mogens Brøndsted Nielsen
DOI:10.1021/ol5015587
日期:2014.7.18
Stable bis(gold(I) alkynyl) complexes of tetraethynylethene (TEE) derivatives were readily prepared and employed in Sonogashira-like palladium-catalyzed phosphine-gold(I) halide elimination reactions with aryl iodides and redox-active tetrathiafulvalene (TTF) mono- and bisiodides. This presents a particularly convenient method for the preparation of symmetrical and asymmetrical tetrathiafulvalene (TTF)-fused radiaannulenes in good yields.