97717-41-4Relevant academic research and scientific papers
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.
