Spring Open Two-plus-Two Electron Storage in a Disulfide-Strapped Methyl Viologen Derivative
作者:Andrew C. Benniston、Jerry Hagon、Xiaoyan He、Songjie Yang、Ross W. Harrington
DOI:10.1021/ol203099h
日期:2012.1.20
The synthesis of a disulfide-strapped viologen derivative is described starting from 4,4′-bipyridinyl-3,3′-diol. The first two one-electronreduction potentials, as determined by cyclic voltammetry, occur at E1/2 = −0.03 V and E1/2 = −0.16 V vs Ag/AgCl. This is accompanied by two more well separated one-electronreductions at E1/2 = −1.26 V and E1/2 = −1.54 V vs Ag/AgCl and the breaking of the disulfide
Highly-strained cyclophanes bearing both photo- and electro-active constituents
作者:Andrew C. Benniston、Anthony Harriman、Songjie Yang、Ross W. Harrington
DOI:10.1016/j.tetlet.2011.08.013
日期:2011.10
The synthesis of a highly-strained cyclophane comprising azobenzene and methyl viologen units was achieved by coupling 3,3'-dihydroxy-4,4'-bipyridine with azobenzoic acid in CH(2)Cl(2). The molecular structure, determined by single-crystal X-ray crystallography, shows that the azobenzene N=N unit adopts the trans conformation and that the bipyridinium unit is twisted. The cyclic voltammogram recorded for the target compound displays an irreversible wave at -0.37 V vs Ag/AgCl, associated with the one-electron reduction of the bipyridinium subunit. A further wave is seen at E(1/2) = -1.52 V versus Ag/AgCl and is assigned to one-electron reduction of the azobenzene group. Visible light illumination of the azobenzene chromophore in CH(3)CN triggers trans to cis isomerization but the process is irreversible. (C) 2011 Elsevier Ltd. All rights reserved.
Controlling electron delocalisation in constrained N,N′-dimethyl-4,4′-bipyridinium dications
作者:Andrew C. Benniston、Anthony Harriman、Peiyi Li、James P. Rostron
DOI:10.1016/j.tetlet.2005.08.162
日期:2005.10
The synthesis is described of two N,N'-dimethyl-4,4'-bipyridinium salts for which the two pyridinium rings are connected via varying length alkoxy chains attached at the 3,3'-locations. (c) 2005 Published by Elsevier Ltd.
KASZMAREK, LUKASZ, J. PRAKT. CHEM., 329,(1987) N 4, 592-598