Methyl orange - indicator , CAS No.547-58-0

CAS: 547-58-0 Cat. No.: M101227 Formula: C14H14N3NaO3S Molecular Weight: 327.33 EC Number: 208-925-3
AVAILABLE TO ORDER
GRADE & PURITY Indicator ? Indicator grade — characterized dye giving a defined color change at a known transition. Use to signal pH or titration endpoints visually.
Synonyms
(R)-1-cyclohexyl-1-phenyl-3-(pyrrolidin-1-yl)propan-1-ol hydrochloride | Methyloranz [Czech] | Oranz kysela 52 [Czech] | Helianthin | sodium;4-[[4-(dimethylamino)phenyl]diazenyl]benzenesulfonate | Benzenesulfonic acid, 4-[[4-(dimethylamino)phenyl]azo]-, s
Storage
Room temperature
Shipped In
Normal
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Size
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Qty
25g
M101227-25g
4 In stock
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$14.90

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100g
M101227-100g
Made to order · 8–12 wks

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Why this grade

indicator Indicator for sensitive chromatographic and analytical workflows requiring minimal baseline interference.

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Storage & shipping

Room temperature Ships Normal Check lot-specific COA for exact specifications.

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Quality documents

SDS, COA, datasheet, and spec sheet available for download. Lot-specific COA accessible via lot number lookup.

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Literature proof

Cited in 1104 peer-reviewed publications across chromatography, organic synthesis, and cross-coupling reactions.

Specifications

Synonyms
(R)-1-cyclohexyl-1-phenyl-3-(pyrrolidin-1-yl)propan-1-ol hydrochloride | Methyloranz [Czech] | Oranz kysela 52 [Czech] | Helianthin | sodium;4-[[4-(dimethylamino)phenyl]diazenyl]benzenesulfonate | Benzenesulfonic acid, 4-[[4-(dimethylamino)phenyl]azo]-, s
Specifications & Purity
indicator
Storage
Room temperature
Shipped In
Normal
Grade
Indicator
Names and Identifiers
Pubchem Sid488200471
Pubchem Sid Urlhttps://pubchem.ncbi.nlm.nih.gov/substance/488200471
Canonical SmilesCN(C)C1=CC=C(C=C1)N=NC2=CC=C(C=C2)S(=O)(=O)[O-].[Na+]
IUPAC Namesodium;4-[[4-(dimethylamino)phenyl]diazenyl]benzenesulfonate
InChIKeySTZCRXQWRGQSJD-UHFFFAOYSA-M
INCHI1S/C14H15N3O3S.Na/c1-17(2)13-7-3-11(4-8-13)15-16-12-5-9-14(10-6-12)21(18,19)20;/h3-10H,1-2H3,(H,18,19,20);/q;+1/p-1
Isomeric SMILES CN(C)C1=CC=C(C=C1)N=NC2=CC=C(C=C2)S(=O)(=O)[O-].[Na+]
UN Number 3143
Packing Group I
Molecular Weight 327.33
Reaxy-Rn 3581305
Reaxys-RN_link_address https://www.reaxys.com/reaxys/secured/hopinto.do?context=S&query=IDE.XRN=3581305&ln=

Documentation

📋 Safety Data Sheet (SDS)

Comprehensive hazard, handling, storage, and regulatory compliance document.

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✅ Certificate of Analysis (COA)

Lot-specific quality data. Enter your lot number to retrieve the exact COA.

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📊 Datasheet

Quick-reference summary of product specifications and applications.

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🔬 Specification Sheet

Full quality attributes and acceptance criteria for this grade.

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Advanced Data

Taxonomic Classification

Taxonomy Tree

KingdomOrganic compounds
SuperclassOrganoheterocyclic compounds
ClassAzobenzenes
SubclassNot available
Intermediate Tree Nodes Not available
Direct ParentAzobenzenes
Alternative Parents Benzenesulfonic acids and derivatives  Benzenesulfonyl compounds  1-sulfo,2-unsubstituted aromatic compounds  Dialkylarylamines  Aniline and substituted anilines  Sulfonyls  Organosulfonic acids  Azo compounds  Propargyl-type 1,3-dipolar organic compounds  Organic zwitterions  Organic sodium salts  Organic oxides  Hydrocarbon derivatives  
Molecular FrameworkAromatic homomonocyclic compounds
Substituents Azobenzene - Benzenesulfonate - Arylsulfonic acid or derivatives - 1-sulfo,2-unsubstituted aromatic compound - Benzenesulfonyl group - Tertiary aliphatic/aromatic amine - Dialkylarylamine - Aniline or substituted anilines - Benzenoid - Monocyclic benzene moiety - Organic sulfonic acid or derivatives - Organosulfonic acid or derivatives - Organosulfonic acid - Sulfonyl - Azo compound - Tertiary amine - Organic alkali metal salt - Organic 1,3-dipolar compound - Propargyl-type 1,3-dipolar organic compound - Organic sodium salt - Amine - Organic oxygen compound - Organic oxide - Hydrocarbon derivative - Organosulfur compound - Organonitrogen compound - Organic zwitterion - Organic salt - Organic nitrogen compound - Aromatic homomonocyclic compound
DescriptionThis compound belongs to the class of organic compounds known as azobenzenes. These are organonitrogen aromatic compounds that contain a central azo group, where each nitrogen atom is conjugated to a benzene ring.
External Descriptors Not available
3D Structure
Interactive Chemical Structure Model





Certificates(CoA,COO,BSE/TSE and Analysis Chart)
C of A & Other Certificates(BSE/TSE, COO):
Analytical Chart:

Find and download the COA for your product by matching the lot number on the packaging.

17 results found

Lot NumberCertificate TypeDateItem
H2625107Certificate of AnalysisSep 01, 2026 M101227
D2602384Certificate of AnalysisApr 11, 2026 M101227
L2508132Certificate of AnalysisMar 23, 2026 M101227
L2525128Certificate of AnalysisDec 27, 2025 M101227
K2507129Certificate of AnalysisNov 21, 2025 M101227
G2528014Certificate of AnalysisJul 31, 2025 M101227
F2512038Certificate of AnalysisJun 18, 2025 M101227
A2514483Certificate of AnalysisJan 22, 2025 M101227
K2216685Certificate of AnalysisNov 18, 2022 M101227
K2216689Certificate of AnalysisNov 18, 2022 M101227
K2216691Certificate of AnalysisNov 18, 2022 M101227
K2216789Certificate of AnalysisNov 18, 2022 M101227
G2228804Certificate of AnalysisMar 08, 2022 M101227
G2228805Certificate of AnalysisMar 08, 2022 M101227
A2306177Certificate of AnalysisMar 08, 2022 M101227
C2202455Certificate of AnalysisMar 08, 2022 M101227
C2202453Certificate of AnalysisMar 08, 2022 M101227
Chemical and Physical Properties
SolubilitySlightly soluble in water, insoluble in ethanol, easily soluble in hot water.
SensitivityMoisture sensitive.
Boil Point(°C)100°C
Melt Point(°C)>300°C
Molecular Weight327.340 g/mol
XLogP3
Hydrogen Bond Donor Count0
Hydrogen Bond Acceptor Count6
Rotatable Bond Count4
Exact Mass327.065 Da
Monoisotopic Mass327.065 Da
Topological Polar Surface Area93.500 Ų
Heavy Atom Count22
Formal Charge0
Complexity448.000
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
The total count of all stereochemical bonds0
Covalently-Bonded Unit Count2
Documents & Articles
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Solution Calculators
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