nitrophenols has been researched along with cyclopentanol* in 1 studies
1 other study(ies) available for nitrophenols and cyclopentanol
| Article | Year |
|---|---|
The design of boronic acid spectroscopic reporter compounds by taking advantage of the pK(a)-lowering effect of diol binding: nitrophenol-based color reporters for diols.
The complex that forms between a boronic acid and a diol is often much more acidic than the starting boronic acid. In conditions where the solution pH is between the two pK(a) values, the boron atom will convert from a neutral trigonal form to an anionic tetrahedral form upon complexation. Such a change is likely to dramatically alter the electron density of neighboring groups. Utilizing this effect, we have designed and synthesized two nitrophenol-based boronic acid reporter compounds that change ionization states and therefore spectroscopic properties upon diol binding. Both compounds show significant UV changes upon addition of saccharides. For example, a blue shift of the absorption max from 373 to 332 nm was observed with the addition of D-fructose to 2-hydroxy-5-nitrophenylboronic acid at neutral pH. Such a reporter compound can be used as a recognition and signaling unit for the construction of polyboronic acid sensors for the selective and specific recognitions of saccharides of biological significance. Topics: Boronic Acids; Carbohydrates; Colorimetry; Cyclopentanes; Drug Design; Fructose; Glucose; Glycols; Hydrogen-Ion Concentration; Molecular Structure; Nitrophenols; Polymers; Spectrophotometry, Ultraviolet | 2004 |