English name: Bromocresol green; Bromocresol green sodium salt; 3,3 ′, 5,5′-Tetrabromo-m-cresol sulfonaphthalein
Other names: bromocresol blue; tetrabromo-cresol sulfophenolphthalein; 3,3 ′, 5,5′-tetrabromo-cresol phenolphthalein
CAS number: 76-60-8
C21H14Br4O5S = 698.02
Level: IND
pH color change range: 3.8 (yellow-green) ~ 5.4 (blue)
Loss on drying: ≤3.0%
Ethanol dissolution test: qualified mass absorption coefficient α1 (λ1, pH 3.8) / (L / cm • g): 24.0 ～ 28.0
Mass absorption coefficient α2 (λ2, pH 5.4) / (L / cm • g): 53.0 ～ 58.0
Residue on ignition: ≤0.25%
Maximum absorption wavelength λ1 (pH 3.8) / (nm): 440 ～ 445
Maximum absorption wavelength λ2 (pH 5.4) / (nm): 615 ～ 618
Properties: white or slightly yellow crystals. Easily soluble in ethanol, ether and ethyl acetate, soluble in benzene, slightly soluble in water. Melting point 218 ~ 219 ℃. Maximum absorption wavelength 423nm
Uses: biochemical research. Acid-base indicator, its sodium salt is commonly used for colorimetric determination of pH: RT
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