1.08175

Thymolphthalein

pH indicator, ACS, Reag. Ph Eur

• Synonym(s): Thymolphthalein
• Empirical Formula (Hill Notation): C₂₈H₃₀O₄
• CAS Number: 125-20-2
• Molecular Weight: 430.54
• MDL number: MFCD00005909
• UNSPSC Code: 12171502
• EC Index Number: 204-729-7
• NACRES: NB.21

Properties

• product name: Thymolphthalein, indicator ACS,Reag. Ph Eur
• grade: ACS reagent
• Quality Level: 200
• agency: reag. Ph. Eur.
• form: solid
• loss: ≤1% loss on drying, 110°C
• color: white to almost white
• visual transition interval: 9.0-10.5, colorless to blue
• mp: 253 °C
• bulk density: 400 kg/m³
• λmax: 592-596 nm (buffer pH 10.5)
• storage temp.: 2-30°C
• InChI: 1S/C28H30O4/c1-15(2)20-13-23(17(5)11-25(20)29)28(22-10-8-7-9-19(22)27(31)32-28)24-14-21(16(3)4)26(30)12-18(24)6/h7-16,29-30H,1-6H3
• InChI key: LDKDGDIWEUUXSH-UHFFFAOYSA-N

Description

Application

• Electrode Based on the MWCNTs and Electropolymerized Thymolphthalein for the Voltammetric Determination of Total Isopropylmethylphenols in Spices: This study developed a sensitive electrochemical sensor for quantifying thymol and carvacrol in spices using an electrode modified with multi-walled carbon nanotubes and electropolymerized thymolphthalein (Chernousova et al., 2023).


• Fluorescence Enhancement Mechanism of Thymolphthalein-Based Probe by Coordination Interaction with Zinc Ion: This research explored the fluorescence enhancement of a thymolphthalein-based probe through coordination with zinc ions, highlighting its potential in analytical applications (Huang et al., 2021).


• pH-Triggered Visual Detection of Escherichia coli Based on the Co-Assembly of Bacitracin and Thymolphthalein: This article presents a novel method for detecting E. coli through pH-triggered visual changes using a thymolphthalein and bacitracin-based probe (Lin et al., 2023).


• Bio-Thymol Containing New High-Performance Thymolphthalein-Based Polybenzoxazine: Thermal, Superhydrophobic and Dielectric Properties: The study reports on a new polybenzoxazine material incorporating thymolphthalein, showcasing enhanced thermal, hydrophobic, and dielectric properties (Srinivasan et al., 2023).

Analysis Note

Identity (UV/VIS-Spectrum): passes test
Appearance: White to almost white powder, eventually slightly yellowish.
Clarity of solution (1 g/l; ethanol): passes test
Absorption maximum λ_max. (buffer pH 10.5): 592 - 596 nm
Spec. Absorptivity A 1%/1cm (λ_max; 0.01 g/l; buffer pH 10.5; calculated on anhydrous substance): 800 - 900
Transition range: pH 9.0 - pH 10.5 colourless - blue
Transition range (according to ACS): passes test
Transition interval (according Reag. Ph. Eur.): passes test
Loss on drying (110 °C): ≤ 1 %

Safety Information

• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 3
• flash_point_f: Not applicable
• flash_point_c: Not applicable