Visual recognition of triamines by phenolphthalein derivatives: consideration of the structure of the colored complex

Visible responses under high pressure in crystals: phenolphthalein and its analogues with adjustable ring-opening threshold pressures

The ring-opening reaction of phenolphthalein (PP) crystals under hydrostatic pressure provided by using a diamond anvil cell (DAC) is described in this paper for the first time. The color of the crystals changed into red from colorless visibly. The ring-opening threshold pressures could be adjusted by changing the substituent groups. Mechanochromic responses under hydrostatic pressure could also be achieved in polymer blends, which contributes to their practical applications.

Bidirectional and Colorimetric Recognition of Sodium and Potassium Ions

Host 1 based on the phenolphthalein skeleton and two crown ether moieties demonstrated opposite behaviors toward sodium and potassium cations caused by bidirectional complexation. [reaction: see text]

Facile Quantification of Enantiomeric Excess and Concentration with Indicator-Displacement Assays: An Example in the Analyses of α-Hydroxyacids

An enantioselective indicator-displacement assay was developed to determine enantiomeric excess (ee) and concentration of alpha-hydroxyacid samples with two independent absorption measurements. The inherent relationship between the absorbance of the indicator-displacement ensemble and the overall concentration and ee of the analyte was established through solution equilibria.