Chlorazole black E

About Chlorazole black E

Chlorazole black E is an indicator carrying the CAS registry number 1937-37-7. With the molecular formula C34H25N9Na2O7S2, it has a molar mass of 781.7 g/mol. Alternative names: Chlorozol Black E and Direct Black 38.

Store sealed in a dry, well-ventilated location away from incompatible materials. Handle it with standard laboratory precautions and appropriate personal protective equipment.

It is commonly used for titration end-point detection, pH determination, analytical testing and indicator for titrations. Our customers for this product work in academic and industrial research and agrochemical production.

We offer Chlorazole black E in 5 g packs with a batch-specific COA, and ship to customers worldwide. A Safety Data Sheet (SDS) and technical specifications are available on request. Larger quantities and custom packaging are available. Request a quote for pricing and lead time.

Typical applications

Titration end-point detection
pH determination
Analytical testing
Indicator for titrations

Industries

Specifications & identifiers

Chemical identifiers
Product name	Chlorazole black E
Catalogue No.	VQ-019690
CAS Number	1937-37-7
IUPAC name	disodium;4-amino-3-[[4-[4-[(2,4-diaminophenyl)diazenyl]phenyl]phenyl]diazenyl]-5-hydroxy-6-phenyldiazenylnaphthalene-2,7-disulfonate
Molecular formula	C₃₄H₂₅N₉Na₂O₇S₂
Molecular weight	781.7 g/mol
Exact mass	781.1114
InChIKey	XRPLBRIHZGVJIC-UHFFFAOYSA-L
SMILES	C1=CC=C(C=C1)N=NC2=C(C3=C(C(=C(C=C3C=C2S(=O)(=O)[O-])S(=O)(=O)[O-])N=NC4=CC=C(C=C4)C5=CC=C(C=C5)N=NC6=C(C=C(C=C6)N)N)N)O.[Na+].[Na+]
PubChem CID	5284349

Physical properties
Physical form	Other
H-bond donors / acceptors	4 / 16
TPSA	304 Å²
Synonyms	Chlorozol Black E, Direct Black 38, C.I. Direct Black 38, Chlorazol Black E, Chlorazol black, Calcomine Black, Meta Black, Carbide Black E, Diazine Black E, Fenamin Black E, Fixanol Black E, Amanil Black GL

Documents

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

Frequently asked questions

What is the CAS number of Chlorazole black E?

The CAS Registry Number of Chlorazole black E is 1937-37-7. It is also known as Chlorozol Black E, Direct Black 38, C.I. Direct Black 38.

What is the molecular formula and molecular weight of Chlorazole black E?

Chlorazole black E has the molecular formula C34H25N9Na2O7S2 and a molecular weight of 781.7 g/mol.

Which grade and pack sizes of Chlorazole black E can I order?

We supply Chlorazole black E, in 5 g packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Chlorazole black E?

Yes. Every lot of Chlorazole black E 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 Chlorazole black E be shipped internationally?

Yes. We export Chlorazole black E worldwide by air and sea freight or express courier, on EXW, FOB, CIF, CFR or DAP Incoterms, with full export documentation.