α-CD/Crown-appended diazophenol for selective sensing of amines = 아민의 선택적인 센스에 대한 알파-CD/크라운부착 디아조페놀

Abstract

Azophenol dyes having the permethylated cyclodextrin and/or crown moieties have been synthesized. Compound 1 provides critical information on discriminating 1-3° amines with unique color changes. Addition of 1° and 2° amines to 1 shifts the absorbance maximum of 1 from 380 to ∼580 and ∼530 nm, respectively, but no change is observed with 3° amines. The high selectivity of 1 is mainly due to H-bonding between the ammonium H atoms of the amine and oxygen atoms of the crown-6.