Article ID Journal Published Year Pages File Type
745064 Sensors and Actuators B: Chemical 2009 8 Pages PDF
Abstract

1-Arylazo-5,5-dimethyl dipyrromethanes (azo-DPM's) have been synthesized by electrophilic substitution reactions of 5,5-dimethyl dipyrromethanes in aqueous solution in 23–68% yields. The solution phase binding studies of azo-DPM's have been investigated by naked eye, absorption and proton NMR spectroscopy. The receptors, appended with electron-withdrawing groups display enhanced affinity and selectivity for F−, H2PO4− and AcO− than electron-donating groups in different solvents. Furthermore, the solvatochromic responses of 2,5-bis(4′-nitrophenyl)azo-pyrrole have been examined by visual and UV–vis spectroscopy with or without structurally different anions in a variety of solvents. The present studies of anion receptors may be used in environmental sensors, molecular electronics and development of molecular switches.

Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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