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Stains, Fluorescent Dyes & Histology Reagents

α-Naphtholbenzein (pH Indicator)

Available on request

Order α-Naphtholbenzein (pH Indicator) (CAS 145-50-6) online at Zemixal: C27H18O2, COA and SDS with every lot, worldwide shipping.

Pack sizes
α-Naphtholbenzein (pH Indicator) chemical structure
CAS number145-50-6
FormulaC27H18O2
Molar mass374.4 g/mol
Physical formPowder
HS code29145000
InChIKeyVDDWRTZCUJCDJM-SOYKGTTHSA-N
IUPAC name(4E)-4-[(4-hydroxynaphthalen-1-yl)-phenylmethylidene]naphthalen-1-one

About α-Naphtholbenzein (pH Indicator)

α-Naphtholbenzein (pH Indicator) sits in our stains, Fluorescent Dyes & Histology Reagents section and ships worldwide from stock or short lead time. For your records, the material is defined by CAS 145-50-6, formula C27H18O2 and molar mass 374.4 g/mol. Expect dark reddish brown powder.

Typical applications

  • Histology & cytology staining
  • Microscopy
  • Clinical laboratories
  • Indicator for titrations

Storage and safety notes

Literature values: melting point 230-235 °C and density 1.28 g/cm3. Hazard communication follows GHS (Warning: H315, H319 and H335). Our SDS lists exposure controls and first-aid measures.

Order it in 5 g, 25 g, 100 g and 1 kg packs or ask for a bulk quotation. Each lot travels with a batch certificate of analysis and a 16-section SDS. Send an enquiry through the quote panel and you get a formal offer with Incoterms and delivery time.

Typical uses

  • Histology & cytology staining
  • Microscopy
  • Clinical laboratories
  • Indicator for titrations

Applications

Diagnostics, Life Science and BiotechResearch Labs and UniversitiesTextiles, Dyes and Leather

Specifications and identifiers

Specifications of α-Naphtholbenzein (pH Indicator)
Product nameα-Naphtholbenzein (pH Indicator)
Catalogue numberZX-000741
CAS number145-50-6
IUPAC name(4E)-4-[(4-hydroxynaphthalen-1-yl)-phenylmethylidene]naphthalen-1-one
Molecular formulaC27H18O2
Molar mass374.4 g/mol
Exact mass374.1307
Physical formPowder
AppearanceDark reddish brown powder
Melting point230-235 °C
Density1.28 g/cm3
XLogP36.6
H-bond donors / acceptors1 / 2
Topological polar surface area37.3 Ų
HS code29145000
InChIKeyVDDWRTZCUJCDJM-SOYKGTTHSA-N
SMILESC1=CC=C(C=C1)/C(=C\2/C=CC(=O)C3=CC=CC=C23)/C4=CC=C(C5=CC=CC=C54)O
PubChem CID3033966
Synonyms4,4'-(a-Hydroxybenzylidene)di-1-naphthol, p-naphtholbenzein, 1(4H)-Naphthalenone, 4-[(4-hydroxy-1-naphthalenyl)phenylmethylene]-, 1(4H)-Naphthalenone, 4-((4-hydroxy-1-naphthalenyl)phenylmethylene)-, alphaNaphtholbenzein, 4(alpha(4Hydroxy1naphthyl)benzylidene)naphthalen1(4H)one, 1(4H)Naphthalenone, 4(alpha(4hydroxy1naphthyl)benzylidene), 1(4H)Naphthalenone, 4((4hydroxy1naphthalenyl)phenylmethylene), 1(4H)Naphthalenone, 4(alpha(4hydroxy1naphthyl)benzylidene) (8CI), 1-Naphtholbenzein, 4-[(4-Hydroxy-1-naphthalenyl)phenylmethylene]-1(4H)-naphthalenone, Naphtholbenzein

Lot values are stated on the batch certificate of analysis. Ask for a typical COA with your quotation.

Safety and GHS hazards

GHS07 Irritant or harmful
Irritant or harmful

Signal word Warning

  • H315Causes skin irritation
  • H319Causes serious eye irritation
  • H335May cause respiratory irritation

Precautionary statements P261, P264, P264 + P265, P271, P280, P302 + P352, P304 + P340, P305 + P351 + P338, P319, P321, P332 + P317, P337 + P317, P362 + P364, P403 + P233, P405, P501

Classification summarised from public GHS notifications. It can vary with grade and concentration, so always follow the SDS supplied with your lot.

Pack sizes

Pack sizes of α-Naphtholbenzein (pH Indicator)
5 gQuoted on request
25 gQuoted on request
100 gQuoted on request
1 kgQuoted on request

Need a different size? Bulk drums and custom packing are quoted on request through the quote form on this page.

Questions about α-Naphtholbenzein (pH Indicator)

Which CAS number identifies α-Naphtholbenzein (pH Indicator)?
α-Naphtholbenzein (pH Indicator) is registered under CAS 145-50-6. You may also see it listed as 4,4'-(a-Hydroxybenzylidene)di-1-naphthol, p-naphtholbenzein, 1(4H)-Naphthalenone, 4-[(4-hydroxy-1-naphthalenyl)phenylmethylene]-. Our catalogue number for this item is ZX-000741.
What are the formula and molar mass of α-Naphtholbenzein (pH Indicator)?
For α-Naphtholbenzein (pH Indicator), its formula is C27H18O2 and its molar mass is 374.4 g/mol. The systematic (IUPAC) name is (4E)-4-[(4-hydroxynaphthalen-1-yl)-phenylmethylidene]naphthalen-1-one. InChIKey VDDWRTZCUJCDJM-SOYKGTTHSA-N lets you match it in any structure database.
What grade and pack sizes are available for α-Naphtholbenzein (pH Indicator)?
The grade and assay are confirmed on the quotation and the batch COA. Standard packs are 5 g, 25 g, 100 g, 1 kg. Larger quantities and custom packing can be quoted on request.
Which documents come with α-Naphtholbenzein (pH Indicator)?
Each lot ships with a batch certificate of analysis and a 16-section GHS safety data sheet. A typical COA or specification sheet can be shared with the quotation before you order.
Can Zemixal ship α-Naphtholbenzein (pH Indicator) to my country?
Yes. Because α-Naphtholbenzein (pH Indicator) is classed as hazardous, it travels in UN-approved packaging as dangerous goods under IATA or IMDG rules, with the export paperwork your broker needs.

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