27768-49-6Relevant academic research and scientific papers
Synthesis and tunability of highly electron-accepting, N-benzylated "phosphaviologens"
Stolar, Monika,Borau-Garcia, Javier,Toonen, Mark,Baumgartner, Thomas
, p. 3366 - 3371 (2015)
We report a structure-property study on phosphoryl-bridged viologen analogues with a remarkably low reduction threshold. Utilizing different benzyl groups for N-quaternization, we were able to confirm the p-benzyl substituent effect on the electronic tuna
The effect of boronic acid acidity on performance of viologen-based boronic acids in a two-component optical glucose-sensing system
Sharrett, Zachary,Gamsey, Soya,Fat, Jonathan,Cunningham-Bryant, Daniel,Wessling, Ritchie A.,Singaram, Bakthan
, p. 5125 - 5129 (2007)
A two-component saccharide sensing system using the fluorescent dye, hydroxypyrene trisulfonic acid, combined with a boronic acid functional viologen as a receptor/quencher in pH 7.4 buffer solution has been further investigated. The effect of substituents on the acidity of the boronic acid was measured. The boronic acid pKa changed in the expected manner when electron donating or withdrawing groups were present. The glucose binding constants were dependent on pKa, but no simple correlation was observed for the Stern-Volmer quenching constants and the fluorescence signal modulation.
Photochromism of Viologen Crystals
Kamogawa, Hiroyoshi,Suzuki, Tsuyoshi
, p. 794 - 796 (1987)
Some viologen crystals bearing a p-toluenesulfonate anion as a counter ion were shown to exhibit reversible photoreductions (photochromism) either in air or under vacuum, whereas in a poly(N-vinyl-2-pyrrolidone) matrix all investigated viologens indicated reversible photocolor developments.Amphoteric ions such as 1,1'-bis(3-sulfonatopropyl)-4,4'-bipyridinium also developed colors with high stabilities.
Electrochromic Poly(chalcogenoviologen)s as Anode Materials for High-Performance Organic Radical Lithium-Ion Batteries
Li, Guoping,Zhang, Bingjie,Wang, Jianwei,Zhao, Hongyang,Ma, Wenqiang,Xu, Letian,Zhang, Weidong,Zhou, Kun,Du, Yaping,He, Gang
, p. 8468 - 8473 (2019)
A series of electrochromic electron-accepting poly(chalcogenoviologen)s with multiple, stable, and reversible redox centers were used as anodic materials in organic radical lithium-ion batteries (ORLIBs). The introduction of heavy atoms (S, Se, and Te) into the viologen scaffold significantly improved the capacity and cycling stability of the ORLIBs. Notably, the poly(Te-BnV) anode was able to intercalate 20 Li ions and showed higher conductivity and insolubility in the electrolyte, thus contributing to a reversible capacity of 502 mAh g?1 at 100 mA g?1 when the Coulombic efficiency approached 100 %. The charged/discharged state of flexible electrochromic batteries fabricated from these anodic materials could be monitored visually owing to the unique electrochromic and redox properties of the materials. This study opens a promising avenue for the development of organic polymer-based electrodes for flexible hybrid visual electronics.
Targeted synthesis of ionic liquid-polyoxometalate derived Mo-based electrodes for advanced electrochemical performance
Chen, Guojian,Zhang, Lei,Zhang, Yadong,Liu, Ke,Long, Zhouyang,Wang, Ying
, p. 7194 - 7201 (2019)
Rational design of advanced electrode materials with high capacity and long cycle stability is a great challenge for both lithium and sodium storage. In this work, we report a versatile strategy for the synthesis of N/P-codoped MoO2@carbon (N/P
Improved complexation of paraquats with crown ether-based pyridyl cryptands
Price, Terry L.,Slebodnick, Carla,Gibson, Harry W.
, (2017)
The commonly used paraquat guest N,N′-dimethyl-4,4′-bipyridinium bis(hexafluorophosphate) (7) was targeted for structural alterations to improve the binding constants with crown ethers and cryptands. The association constant was improved by one order of magnitude (to Ka?=?1.00?×?106?mol?L?1) with the dibenzo-30-crown-10 pyridyl cryptand host 5 by changing the N-methyl groups to benzyl and the counterions from PF6 to TFSI, that is, 11. Moreover, through addition of a p-bromobenzyloxy moiety on the 4-position of the pyridyl ring of cryptand 18, an association constant of Ka?=?5.35?×?106?mol?L?1 was achieved with paraquat 11.
Substituent-Modulated Assembly Formation: An Approach to Enhancing the Photostability of Photoelectric-Sensitive Chalcogenide-Based Ion-Pair Hybrids
Lin, Jian,Fu, Zhixing,Zhang, Jiaxu,Zhu, Yujia,Hu, Dandan,Li, Dongsheng,Wu, Tao
, p. 3119 - 3122 (2017)
A series of electronically active viologen dications (RV) with tunable substituent groups were utilized to hybridize with [Ge4S10]4- (T2 cluster) to form the hybrids of T2@RV. These hybrids exhibited variable supermolecula
Spectroscopic detection of excited-state electron transfer in porphyrin viologen system
Force, R. Ken,McMahon, Robert J.,Yu, Jie,Wrighton, Mark S.
, p. 23 - 30 (1989)
Pulsed laser excitation (354.7 nm, 10 ns pulse) of a pyridyltritolylporphyrin chromophore covalently linked to a dibenzylviologen, Bz2V2+, electron acceptor (porphyrin-viologen, P-V2+) in CH3CN leads to intramolecular electron transfer quenching of the porphyrin singlet excited state within the laser pulsewidth to reduce the linked Bz2V2+ to Bz2V+.Transient Bz2V+ can be detected directly by resonance Raman spectroscopy.The same transient features are obtained from pulsed laser excitation of a mixture of porphyrin (P) and dibenzylviologen in CH3CN where Bz2V2+ quenches the porphyrin fluorescence, establishing bimolecular excited state electron transfer quenching to yield Bz2V+.Confirmation of our assignments of the transient Bz2V+ comes from comparison of the spectra with the resonance Raman spectrum of an authentic sample of Bz2V+, and of electrochemically reduced P-V2+ which has been spectroscopically confirmed to formed P-V+.Fluorescence lifetime determinations for P-V2+ and P yield a rate constant for intramolecular electron transfer, ket = 8 x 1E7 s-1, consistent with the ability to observe electron transfer within the laser pulsewidth.
Metal-free reduction of unsaturated carbonyls, quinones, and pyridinium salts with tetrahydroxydiboron/water
Li, Tiejun,Peng, Henian,Tang, Wenjun,Tian, Duanshuai,Xu, Guangqing,Yang, He
, p. 4327 - 4337 (2021/05/31)
A series of unsaturated carbonyls, quinones, and pyridinium salts have been effectively reduced to the corresponding saturated carbonyls, dihydroxybenzenes, and hydropyridines in moderate to high yields with tetrahydroxydiboron/water as a mild, convenient, and metal-free reduction system. Deuterium-labeling experiments have revealed this protocol to be an exclusive transfer hydrogenation process from water. This journal is
Single-molecule charge transport through positively charged electrostatic anchors
Chen, Hongliang,Brasiliense, Vitor,Mo, Jingshan,Zhang, Long,Jiao, Yang,Chen, Zhu,Jones, Leighton O.,He, Gen,Guo, Qing-Hui,Chen, Xiao-Yang,Song, Bo,Schatz, George C.,Stoddart, J. Fraser
supporting information, p. 2886 - 2895 (2021/03/03)
The charge transport in single-molecule junctions depends critically on the chemical identity of the anchor groups that are used to connect the molecular wires to the electrodes. In this research, we report a new anchoring strategy, called the electrostat
