α-Naphtholbenzein (pH Indicator), AR

Name: α-Naphtholbenzein (pH Indicator), AR
Brand: Vaqora Chemicals
SKU: VQ-045977

About α-Naphtholbenzein (pH Indicator), AR

α-Naphtholbenzein (pH Indicator) (CAS 145-50-6) is a biological stain offered by Vaqora Chemicals in AR grade. Its molecular formula is C27H18O2 and its molecular weight is 374.4 g/mol. The IUPAC name is (4E)-4-[(4-hydroxynaphthalen-1-yl)-phenylmethylidene]naphthalen-1-one. It is also known as p-Naphtholbenzein or alphaNaphtholbenzein.

Keep the container tightly sealed and store it in a cool, dry area. It carries the GHS signal word “Warning” with 3 hazard statements. Review the Safety Data Sheet before use.

Typical applications include histology and cytology staining, microscopy and clinical laboratories. It is used across academic and industrial research, diagnostics and biotechnology and textiles and dyeing.

Standard pack sizes are 5 g and 25 g, and every batch ships with a Certificate of Analysis (COA) and we export worldwide. SDS and detailed specification sheets can be requested with your quotation.

Typical applications

Histology & cytology staining
Microscopy
Clinical laboratories

Industries

Grade guides

Specifications & identifiers

Chemical identifiers
Product name	α-Naphtholbenzein (pH Indicator), AR
Catalogue No.	VQ-045977
CAS Number	145-50-6
IUPAC name	(4E)-4-[(4-hydroxynaphthalen-1-yl)-phenylmethylidene]naphthalen-1-one
Molecular formula	C₂₇H₁₈O₂
Molecular weight	374.4 g/mol
Exact mass	374.1307
Grade	AR
HSN code	29145000
InChIKey	VDDWRTZCUJCDJM-SOYKGTTHSA-N
SMILES	C1=CC=C(C=C1)/C(=C\2/C=CC(=O)C3=CC=CC=C23)/C4=CC=C(C5=CC=CC=C54)O
PubChem CID	3033966

Physical properties
Physical form	Other
LogP (XLogP3)	6.6
H-bond donors / acceptors	1 / 2
TPSA	37.3 Å²
Synonyms	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, .alpha.-Naphtholbenzein

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

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 is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Other grades of CAS 145-50-6

α-Naphtholbenzein (pH Indicator)

CAS: 145-50-6
Formula: C₂₇H₁₈O₂
MW: 374.4 g/mol

VQ-000741

BP/USP/EP/Ph. Eur.

α-Naphtholbenzein (pH Indicator), BP/USP/EP/Ph. Eur.

CAS: 145-50-6
Formula: C₂₇H₁₈O₂
MW: 374.4 g/mol

VQ-047204

Frequently asked questions

What is the CAS number of α-Naphtholbenzein (pH Indicator), AR?

The CAS Registry Number of α-Naphtholbenzein (pH Indicator), AR is 145-50-6. It is also known as p-Naphtholbenzein, 1(4H)-Naphthalenone, 4-[(4-hydroxy-1-naphthalenyl)phenylmethylene]-, 1(4H)-Naphthalenone, 4-((4-hydroxy-1-naphthalenyl)phenylmethylene)-.

What is the molecular formula and molecular weight of α-Naphtholbenzein (pH Indicator), AR?

α-Naphtholbenzein (pH Indicator), AR has the molecular formula C27H18O2 and a molecular weight of 374.4 g/mol. Its IUPAC name is (4E)-4-[(4-hydroxynaphthalen-1-yl)-phenylmethylidene]naphthalen-1-one.

Which grade and pack sizes of α-Naphtholbenzein (pH Indicator), AR can I order?

We supply α-Naphtholbenzein (pH Indicator), AR in AR grade, in 5 g, 25 g packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with α-Naphtholbenzein (pH Indicator), AR?

Yes. Every lot of α-Naphtholbenzein (pH Indicator), AR is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can α-Naphtholbenzein (pH Indicator), AR be shipped internationally?

Yes. α-Naphtholbenzein (pH Indicator), AR is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.