A synthetic procedure leading to derivatives of tetrathiafulvalene (TTF) incorporating polyether chains of various lengths, some nitrogen analogs, and a 2,6-bis(methylene)pyridine analog has been developed. These compounds possess cage-type structures which were confirmed by X-ray crystallography in four cases, two of which are reported herein for the first time. Structural and electronic features of these cage molecules were correlated to oxidation potentials by the use of semiempirical methods (MNDO-PM3). An investigation of the alkali metal ion affinity using PDMS revealed that these compounds are poor ligands. Finally, in one case, protonation of the core TTF was studied by NMR.
A synthetic procedure leading to derivatives of tetrathiafulvalene (TTF) incorporating polyether chains of various lengths, some nitrogen analogs, and a 2,6-bis(methylene)pyridine analog has been developed. These compounds possess cage-type structures which were confirmed by X-ray crystallography in four cases, two of which are reported herein for the first time. Structural and electronic features of these cage molecules were correlated to oxidation potentials by the use of semiempirical methods (MNDO-PM3). An investigation of the alkali metal ion affinity using PDMS revealed that these compounds are poor ligands. Finally, in one case, protonation of the core TTF was studied by NMR.
Preparation, characterisation and complexation of a redox-active, soft-donor macrocycle
作者:Hilary J. Hartigan、Georg Seeber、Andrew R. Mount、Lesley J. Yellowlees、Neil Robertson
DOI:10.1039/b309317d
日期:——
Two new redox-active macrocycles 2 and 3 have been prepared based on an 18-membered S4N2–donor ring conjugated to one or two CpCo(dithiolene) redox/chromophore units respectively. Cyclic voltammetry for 2 showed one reversible reduction process at −0.29 V and EPR spectroscopy of the reduced form indicated a significant degree of delocalisation of the unpaired electron. The compound 2 showed an intense low-energy absorption at 675 nm (in CH2Cl2) that was shown to shift to higher energy during electrochemical reduction. Interaction of 2 with guest Ag(I) ions was followed by monitoring changes in the electrochemical and spectroscopic behaviour with sequential additions of the guest metal ion and by electrochemistry at a silver electrode. UV/Vis spectroscopic results indicated a strong interaction of Ag(I) with 2 involving large changes in the electronic nature of the macrocycle chromophore. Cyclic voltammetry also indicated interaction between 2 and Ag(I) and suggested the involvement of a film containing 2 on the electrode surface.
A novel macrocycle containing the 4,5-dithio-1,3-dithiole-2-thione unit and a related macrocycle incorporating the tetrathiafulvalene moiety
作者:B. Girmay、J. D. Kilburn、A. E. Underhill、K. S. Varma、M. B. Hursthouse、M. E. Harman、J. Becher、G. Bojesen
DOI:10.1039/c39890001406
日期:——
A novel macrocycle (3) incorporating the 4,5-dithio-1,3-dithiole-2-thione unit has been prepared from 2,6-bis(bromomethyl)pyridine and 4,5-bis(benzoylthio)-1,3-dithiole-2-thione: intramolecular triethylphosphite coupling of (3) leads to a novel macrocyclic π-donor (4) incorporating a non-planar tetrathiafulvalene moiety; the crystal structures of (3) and (4) are reported.
作者:T. K. Hansen、T. Joergensen、F. Jensen、P. H. Thygesen、K. Christiansen、M. B. Hursthouse、M. E. Harman、M. A. Malik、B. Girmay
DOI:10.1021/jo00058a013
日期:1993.3
A synthetic procedure leading to derivatives of tetrathiafulvalene (TTF) incorporating polyether chains of various lengths, some nitrogen analogs, and a 2,6-bis(methylene)pyridine analog has been developed. These compounds possess cage-type structures which were confirmed by X-ray crystallography in four cases, two of which are reported herein for the first time. Structural and electronic features of these cage molecules were correlated to oxidation potentials by the use of semiempirical methods (MNDO-PM3). An investigation of the alkali metal ion affinity using PDMS revealed that these compounds are poor ligands. Finally, in one case, protonation of the core TTF was studied by NMR.