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- W2012806822 abstract "Abstract Azophenol dyes 1 – 5 having the permethylated cyclodextrin and/or crown moieties have been synthesized. Compounds 1 and 2 provide critical information for discrimination among 1°–3° amines by unique color changes. Addition of 1° and 2° amines to solutions of 1 or 2 in chloroform shifts the absorbance maximum of the initial solutions from 380 nm to ∼580 nm 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. The selectivity of 1 possessing the β-cyclodextrin moiety toward amines was higher than that of 2 possessing the α-cyclodextrin moiety. On the other hand, chloroform solutions of 3 or 4 , which lack the crown ether moiety, changed from yellow (380 nm) to pink (500 nm) with the addition of 1° and 2° amines, but with no selectivity. These results indicate that the crown unit in 1 or 2 plays an important role in discriminating among the types of amines." @default.
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- W2012806822 date "2008-07-01" @default.
- W2012806822 modified "2023-10-16" @default.
- W2012806822 title "A color version of the Hinsberg test: permethylated cyclodextrin and crown-appended azophenol for highly selective sensing of amines" @default.
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- W2012806822 doi "https://doi.org/10.1016/j.tet.2008.05.013" @default.
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