Isolation and Characterization of Phenyl Viologen as a Radical Cation and Neutral Molecule
摘要:
The chemical synthesis, isolation, and characterization of phenyl viologen (PV) as a dication, radical cation, and neutral species are described. Single-crystal X-ray diffraction of PV(2+)2Cl(-)center dot 2H(2)O and PV center dot+PF(6)(-center dot)pyridine reveals the expected differences in bond lengths and also a structural change from two coplanar central rings in PV center dot+ to a twist of 36 degrees between the two central rings in PV2+. The phenyl viologen radical cation exhibits behavior characteristic of many radical cations, including weak pi-dimerization in the solid state and reversible pi-dimerization in solution. Electrical conductivity measurements of neutral phenyl viologen, the first such measurements of a neutral viologen, reveal that it is a significantly better conductor than the radical cation. Differences in geometric relaxation during charge transfer offer a possible explanation for the higher conductivity of the neutral viologen.
Isolation and Characterization of Phenyl Viologen as a Radical Cation and Neutral Molecule
摘要:
The chemical synthesis, isolation, and characterization of phenyl viologen (PV) as a dication, radical cation, and neutral species are described. Single-crystal X-ray diffraction of PV(2+)2Cl(-)center dot 2H(2)O and PV center dot+PF(6)(-center dot)pyridine reveals the expected differences in bond lengths and also a structural change from two coplanar central rings in PV center dot+ to a twist of 36 degrees between the two central rings in PV2+. The phenyl viologen radical cation exhibits behavior characteristic of many radical cations, including weak pi-dimerization in the solid state and reversible pi-dimerization in solution. Electrical conductivity measurements of neutral phenyl viologen, the first such measurements of a neutral viologen, reveal that it is a significantly better conductor than the radical cation. Differences in geometric relaxation during charge transfer offer a possible explanation for the higher conductivity of the neutral viologen.
Kinetics of comproportionation of the bipyridilium salt p-cyanophenyl paraquat in propylene carbonate studied by rotating ring–disc electrodes
作者:David R. Rosseinsky、Paul M. S. Monk
DOI:10.1039/ft9908603597
日期:——
The kinetics of the comproportionation reaction CPQ2++ CPQ0→ 2CPQ+(CPQ is 1,1′-(p-cyanophenyl)-4,4′-bipyridilium) have been studied at a rotatingring–discelectrode (RRDE) in propylenecarbonate solution. Some elaboration of the existing analysis is required to encompass comproportionation. The second-order rate constants for comproportionation of CPQ satisfy criteria established in the elaboration
Weitz; Koenig; v. Wistinghausen, Chemische Berichte, 1924, vol. 57, p. 158,163
作者:Weitz、Koenig、v. Wistinghausen
DOI:——
日期:——
ORGANIC LIGHT EMITTING ELEMENT
申请人:CANON KABUSHIKI KAISHA
公开号:US20160079544A1
公开(公告)日:2016-03-17
Provided is an organic light emitting element having stable performance in the air. The organic light emitting element includes: an anode; a cathode; and a first organic compound layer placed between the anode and the cathode, in which: the organic light emitting element further includes a first organic compound layer placed between the cathode and the emission layer, and a second organic compound layer placed between the emission layer and the first organic compound layer, and brought into contact with the first organic compound layer; the first organic compound layer contains a first organic compound; the second organic compound layer contains a second organic compound; and the first organic compound includes an organic compound represented by the following general formula [1], and the second organic compound includes an organic compound different from the first organic compound
US9818957B2
申请人:——
公开号:US9818957B2
公开(公告)日:2017-11-14
Isolation and Characterization of Phenyl Viologen as a Radical Cation and Neutral Molecule
作者:William W. Porter、Thomas P. Vaid
DOI:10.1021/jo050328g
日期:2005.6.1
The chemical synthesis, isolation, and characterization of phenyl viologen (PV) as a dication, radical cation, and neutral species are described. Single-crystal X-ray diffraction of PV(2+)2Cl(-)center dot 2H(2)O and PV center dot+PF(6)(-center dot)pyridine reveals the expected differences in bond lengths and also a structural change from two coplanar central rings in PV center dot+ to a twist of 36 degrees between the two central rings in PV2+. The phenyl viologen radical cation exhibits behavior characteristic of many radical cations, including weak pi-dimerization in the solid state and reversible pi-dimerization in solution. Electrical conductivity measurements of neutral phenyl viologen, the first such measurements of a neutral viologen, reveal that it is a significantly better conductor than the radical cation. Differences in geometric relaxation during charge transfer offer a possible explanation for the higher conductivity of the neutral viologen.