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114553 Sigma-Aldrich

Thymolphthalein

ACS reagent, Dye content 95 %

Synonym: 5′,5′′-Diisopropyl-2′,2′′-dimethylphenolphthalein

  • CAS Number 125-20-2

  • Empirical Formula (Hill Notation) C28H30O4

  • Molecular Weight 430.54

  •  Beilstein/REAXYS Number 359413

  •  EC Number 204-729-7

  •  MDL number MFCD00005909

  •  PubChem Substance ID 24847182

  •  NACRES NA.47

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Properties

Related Categories Analytical Reagents, Analytical/Chromatography, Cell Biology, Hematology and Histology, Indicators,
Quality Level   200
grade   ACS reagent
composition   Dye content, 95%
clarity of soln   passes test
application(s)   titration: suitable
visual transition interval   8.8 - 10.5, colorless to blue
mp   251-253 °C (lit.)
λmax   396 nm (2nd)
  592 nm
SMILES string   CC(C)c1cc(c(C)cc1O)C2(OC(=O)c3ccccc23)c4cc(C(C)C)c(O)cc4C
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

General description

Thymolphthalein (5′, 5′′-Diisopropyl-2′, 2′′-dimethylphenolphthalein) is an acid-base indicator which is colorless in solutions with a pH below 8.5 and blue in solutions with a pH above 9.5. Thymolphthalein has been used as an indicator in periodate-thiosulfate reaction.

Application

Thymolphthalein has been used as a pH indicator in [14C] urea breath test to determine when the CO2 trap is full.

Packaging

10, 50 g in poly bottle

Safety & Documentation

Safety Information

Personal Protective Equipment 
RIDADR 
NONH for all modes of transport
WGK Germany 
WGK 3
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable

Documents

Certificate of Analysis (COA)

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Protocols & Articles
Peer-Reviewed Papers
15

References

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