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p-Naphtholbenzein

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p-Naphtholbenzein Basic information

Product Name:
p-Naphtholbenzein
Synonyms:
  • α-Naphtholbenzein,4,4′-(α-Hydroxybenzylidene)di-1-naphthol, p-naphtholbenzein
  • alpha-Naphtholbenzein, pure, 90% 10GR
  • alpha-Naphtholbenzein, pure, 90% 25GR
  • 1-NAPHTHOLBENZEIN INDICATOR 5 G
  • α- naphthol quinone phenylMethane
  • MAG BIND EQUIPURE GDNA (1X96)
  • 1-Naphtholbenzein indicator Reag. Ph Eur
  • 1(4H)-Naphthalenone, 4-(4-hydroxy-1-naphthalenyl)phenylmethylene-
CAS:
145-50-6
MF:
C27H18O2
MW:
374.43
EINECS:
205-656-3
Product Categories:
  • Benzein
  • Analytical Chemistry
  • Indicator (pH)
  • pH Indicators
Mol File:
145-50-6.mol
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p-Naphtholbenzein Chemical Properties

Melting point:
230-235 °C(lit.)
Boiling point:
463.44°C (rough estimate)
Density 
1.0946 (rough estimate)
vapor density 
12.9 (vs air)
refractive index 
1.4875 (estimate)
storage temp. 
Store at +5°C to +30°C.
solubility 
Solubility Insoluble in water; soluble in ethanol, methanol
form 
Liquid
pka
8.95(at 25℃)
color 
Pale Red-Brown
PH Range
Green (0.0) to yellow (0.8);Yellow (8.2) to green-blue (11.0)
Odor
Odorless
Water Solubility 
insoluble
λmax
210nm
BRN 
3471575
Stability:
Stable. Combustible. Incompatible with strong oxidizing agents.
InChIKey
VDDWRTZCUJCDJM-SOYKGTTHSA-N
CAS DataBase Reference
145-50-6(CAS DataBase Reference)
EPA Substance Registry System
1(4H)-Naphthalenone, 4-[(4-hydroxy-1-naphthalenyl)phenylmethylene]- (145-50-6)
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Safety Information

Hazard Codes 
Xi
Risk Statements 
36/37/38
Safety Statements 
26-36-37/39
WGK Germany 
3
10-21
TSCA 
Yes
HS Code 
29145000

MSDS

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p-Naphtholbenzein Usage And Synthesis

Chemical Properties

deep red to rust-coloured crystals

Uses

alpha-Naphtholbenzein is a pH indicator (pH 0.0-0.8/ pH 8.2-10.0). Dyes and metabolites.

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