2-(4-Dimethylaminophenylazo)benzoesaeure

Bezeichnung:2-(4-Dimethylaminophenylazo)benzoesaeure

CAS-Nr493-52-7

Englisch Name:Methyl Red

CBNumberCB1112962

SummenformelC15H15N3O2

Molgewicht269.3

MOL-Datei493-52-7.mol

Synonyma

2-(4-Dimethylaminophenylazo)benzoesaeure

2-(4-Dimethylaminophenylazo)benzoesaeure physikalisch-chemischer Eigenschaften

Schmelzpunkt	179-182 °C (lit.)
Siedepunkt	412.44°C (rough estimate)
Dichte	0.839 g/mL at 25 °C
chüttdichte	300-500kg/m3
Dampfdichte	9.3 (vs air)
Brechungsindex	1.5930 (estimate)
Flammpunkt	11 °C
storage temp.	Store at +5°C to +30°C.
Löslichkeit	ethanol: soluble1mg/mL
Colour Index	13020
Aggregatzustand	Solid
pka	4.95(at 25℃)
Farbe	Reddish-violet
Geruch (Odor)	Odorless
Säure-Base-Indikators(pH-Indikatoren)	4.4(red)-6.3(yellow)
Wasserlöslichkeit	Practically insoluble in water. Soluble in alcohol, acetic acidSoluble in ethanol. Insoluble in water.
ε(Extinktionskoeffizient)	≥10000 at 282-288nm in methanol ≥20000 at 509-519nm in methanol ≥7000 at 329-335nm in methanol
maximale Wellenlänge (λmax)	410nm, 530nm, 427nm, 519nm
Merck	14,6119
BRN	750102
Stabilität	Stable. Incompatible with strong oxidizing agents.
Major Application	Waveguides, LED sensors, photoresists, liquid crystals, sol-gel matrix, optical sensors, paints, toys, detection of thiols, food freshness sensors, dental product, saliva sampling method, detecting lactic acid, carbohydrates
InChIKey	CEQFOVLGLXCDCX-MSUUIHNZSA-N
CAS Datenbank	493-52-7
IARC	3 (Vol. 8, Sup 7) 1987
NIST chemische Informationen	Benzoic acid, 2-[[4-(dimethylamino)phenyl]azo]-(493-52-7)
EPA chemische Informationen	Methyl red (493-52-7)

Sicherheit

Kennzeichnung gefährlicher	Xn,T,F,Xi,C,N
R-Sätze:	10-20/21/22-68/20/21/22-68-36/38-23/25-11-36/37/38-34-51/53-39/23/24/25-23/24/25
S-Sätze:	36/37-24/25-22-45-33-24-16-7-36-26-36/37/39-61
RIDADR	UN 1170 3/PG 2
WGK Germany	1
RTECS-Nr.	DG8960000
TSCA	Yes
HazardClass	3
PackingGroup	II
HS Code	29270000
Giftige Stoffe Daten	493-52-7(Hazardous Substances Data)

Gefahreninformationscode (GHS)

Methyl Red Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R10:Entzündlich.
R20/21/22:Gesundheitsschädlich beim Einatmen,Verschlucken und Berührung mit der Haut.
R68/20/21/22:Gesundheitsschädlich: Möglichkeit irreversiblen Schadens durch Einatmen,Berührung mit der Haut und durch Verschlucken.
R68:Irreversibler Schaden möglich.
R36/38:Reizt die Augen und die Haut.
R23/25:Giftig beim Einatmen und Verschlucken.
R11:Leichtentzündlich.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
R34:Verursacht Verätzungen.
S-Sätze Betriebsanweisung:
S36/37:Bei der Arbeit geeignete Schutzhandschuhe und Schutzkleidung tragen.
S24/25:Berührung mit den Augen und der Haut vermeiden.
S22:Staub nicht einatmen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
S33:Maßnahmen gegen elektrostatische Aufladungen treffen.
S24:Berührung mit der Haut vermeiden.
S16:Von Zündquellen fernhalten - Nicht rauchen.
S7:Behälter dicht geschlossen halten.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
Chemische Eigenschaften
dark red crystalline powder
Verwenden
As indicator in 0.1% alcoholic solution; pH: 4.4 red, 6.2 yellow. Used for titrating NH3, weak organic bases, e.g., alkaloids; not suitable for organic acids, except oxalic and picric acid. Methyl red is easily reduced, thereby losing its color, and readings should be made promptly. It is gradually being replaced by sulfonphthalein indicators, such as bromcresol green, which are more stable and exhibit a sharper change in color.
Verwenden
Used as pH indicator.
Verwenden
pH indicator in pH range 4.2 - 6.3Methyl red is used as a pH indicator. It is red in pH less than 4.4 and yellow in pH over 6.2. It is used to study its degradation using Fenton's reagent. In microbiology, it is used to identify bacteria producing stable acids by mechanisms of mixed acid fermentation of glucose.
synthetische
2-Aminobenzoic acid?diazo, and N,N-dimethylaniline coupling.
Definition
An acid–base indicator that is red in solutions below a pH of 4.2 and yellow above a pH of 6.3. It is often used for the same types of titration as methyl orange but the transition range of methyl red is nearer neutral (pH7) than that of methyl orange. The two molecules are structurally similar.
Definition
ChEBI: An azo dye consisting of benzoic acid substituted at position 2 by a 4-[(dimethylamino)phenyl]diazenyl group.
Definition
methyl red: An organic dye similarin structure and use to methyl orange.It changes from red below pH4.4 to yellow above pH 6.0 (at 25°C).
Allgemeine Beschreibung
Methyl red solution is an azo dye which turns to red when pH is below 4.4 (yellow pH < 6.2, orange pH 4.4-6.2). Some bacteria utilize glucose to form large amounts of acid with the result that the pH value of the medium falls distinct. Other species produce no or less free acid. This difference can be visualized by using methyl red. This test is used to differentiate enteric bacteria.
Hazard
Questionable carcinogen.
Biochem/physiol Actions
Methyl Red is a maroon red crystal azo dye. Methyl Red is a pH indicator and changes color at a pH of 5.5. Methyl Red is widely used in saliva sampling method. In addition, it is also employed in carbohydrate and lactic acid detection. Methyl Red has been effectively used for intrageneric differentiation of Enterobacteriaceae.
Sicherheitsprofil
Questionable carcinogen with experimental tumorigenic data. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx.
Properties and Applications
moderate soluble in ethanol, insoluble in water. Alcohol solution to join hydrochloric acid for purple; Add sodium hydroxide to dim yellow.
läuterung methode
The acid is extracted with boiling toluene using a Soxhlet apparatus. The crystals which separate on slow cooling to room temperature are filtered off, washed with a little toluene and recrystallised from glacial acetic acid, *benzene or toluene followed by pyridine/water. Alternatively, dissolve it in aqueous 5% NaHCO3 solution, and precipitate it from a hot solution by dropwise addition of aqueous HCl. Repeat this until the extinction coefficients do not increase. [Beilstein 16 IV 504.]

Methyl Red Upstream-Materialien And Downstream Produkte

2-(4-Dimethylaminophenylazo)benzoesaeure Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

493-52-7, Methyl Red Verwandte Suche:

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