107701-39-3Relevant academic research and scientific papers
Triarylimidazole redox catalysts: Electrochemical analysis and empirical correlations
Zhang, Ni-Tao,Zeng, Cheng-Chu,Lam, Chiu Marco,Gbur, Randi K.,Little, R. Daniel
, p. 2104 - 2110 (2013/04/23)
A series of triarylimidazoles was synthesized and characterized electrochemically. The synthetic route is general, providing a pathway to 30 redox mediators that exhibit a > 700 mV range of accessible potentials. Most of the triarylimidazoles display three oxidation peaks where the first redox couple is quasi-reversible. The electronic character of the substituents affects the oxidation potential. This is exemplified by a linear correlation between the first oxidation potential and the sum of the Hammett σ+ substituent constants, as well as with a series of calculated ionization potentials. We close by putting forward a rule of thumb stating that for a given mediator, the upper limit of accessible potentials can be extended by at least 500 mV beyond the largest recorded value. A rationale, the conditions under which the rule is likely to apply, and an example are provided.
New class of imidazoles incorporated with thiophenevinyl conjugation pathway for robust nonlinear optical chromophores
Santos, Javier,Mintz, Eric A.,Zehnder, Oliver,Bosshard, Christian,Bu, Xiu R.,Günter, Peter
, p. 805 - 808 (2007/10/03)
A new series of thermally stable heterocyclic imidazole-based nonlinear optical chromophores has been developed. These chromophores possess a thiophene based stilbene conjugation pathway with a nitro acceptor group attached to the phenyl end. This feature leads to robust chromopores with high thermal stability and enhanced molecular nonlinearity.
Chromotropism of Imidazole Derivatives. Part 1. 4,5-Bis-(4-methoxyphenyl)-2-(4-nitrophenyl)imidazolium Acetate Dihydrate
Sakaino, Yoshiko,Takizawa, Toshiharu,Inouye, Yoshinobu,Kakisawa, Hiroshi
, p. 1623 - 1630 (2007/10/02)
4,5-Bis(4-methoxyphenyl)-2-(4-nitrophenyl)imidazolium acetate dihydrate (1) in the crystalline state exhibits a sensitive colour change from orange-yellow to red on treatment by various methods (drying, trituration, or heating).The colour change was reversible below 70 deg C but above 70 deg C the change was irreversible and the colour deepended.Compound (1) was deprotonated with the loss of one mole of water of crystallization under treatment and can revert to the original by absorption of one mole of water.On heating to 100 deg C, (1) lost all solvent of crystallization to give a deep red material (2). (2) Was considered to be 4,5-bis-(4-methoxyphenyl)-2-(4-nitrophenyl)imidazole which was linked by hydrogen bond from the imino group in one molecule to the nitro oxygen in another.Compound (2) reverted to (1) in saturated AcOH-H2O vapour.
