Visualization of Molecular Length of α, ω-Diamines and Temperature by a Receptor Based on Phenolphthalein and Crown Ether (SYNTHETIC ORGANIC CHEMISTRY-Fine Organic Synthesis)

Abstract

The hybrid molecule 1 consisting of phenolphthalein and crown ether moieties can discriminate the chain length of the α, ω-diamines by color change, while 2 can not. Thus, it is suggested that two crown ether part are necessary to visualize the chain length by the color. The pink color faded at 50 °C and reappeared at 20 °C, which could repeated more than 10 times.