Skip to Content
Merck
All Photos(3)

Key Documents

View All Documentation

Safety Information

424633

Sigma-Aldrich

Azobenzene

98%

Synonym(s):

1,2-Diphenyldiazene; Diphenyldiazene

Sign Into View Organizational & Contract Pricing
All Photos(3)

About This Item

Linear Formula:
C6H5N=NC6H5
CAS Number:
103-33-3
Molecular Weight:
182.22
Beilstein:
1819138
EC Number:
203-102-5
MDL number:
MFCD00003022
UNSPSC Code:
12171500
PubChem Substance ID:
24866581
NACRES:
NA.47

vapor pressure

1 mmHg ( 104 °C)

Quality Level

100

Assay

98%

form

powder or crystals

autoignition temp.

890 °F

technique(s)

titration: suitable

bp

293 °C (lit.)

mp

65-68 °C (lit.)

density

1.09 g/mL at 25 °C (lit.)

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

c1ccc(cc1)\N=N\c2ccccc2

InChI

1S/C12H10N2/c1-3-7-11(8-4-1)13-14-12-9-5-2-6-10-12/h1-10H/b14-13+

InChI key

DMLAVOWQYNRWNQ-BUHFOSPRSA-N

Looking for similar products? Visit Product Comparison Guide

Related Categories

General description

Azobenzene is a chromogen and an azo compound that exhibits trans/cis isomerism yielding isomers that differ in color. It is a simple azoarene compound that shows cis-trans isomerization around the azo bond in response to light.

Application

Azobenzene and its derivatives have multiple applications in the field of mechanical and optical materials, in photopharmacology, and molecular photo-switches including in biological probes.
As human tissue is translucent to red and near-infrared light but opaque to blue and UV light, Azobenzene is important in medicine and photopharmacology for applications that involve shifting the absorptions of both trans and cis isomers of azobenzene to longer wavelengths.

Signal Word

Danger

Hazard Classifications

Acute Tox. 4 Inhalation - Acute Tox. 4 Oral - Aquatic Acute 1 - Aquatic Chronic 1 - Carc. 1B - Muta. 2 - STOT RE 2

Storage Class Code

6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects

WGK

WGK 3

Flash Point(F)

212.0 °F - closed cup

Flash Point(C)

100.0 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

FSL

Group 5: Self-reactive substances
Azo compounds
Hazardous rank I
1st self-reactive materials

ISHL Indicated Name

Substances Subject to be Indicated Names

ISHL Notified Names

Substances Subject to be Notified Names

JAN Code

424633-VAR:
424633-5G:
424633-BULK:
424633-25G:

Choose from one of the most recent versions:

Certificates of Analysis (COA)

Lot/Batch Number
BCCL3292
BCCK0887
BCCG7339
BCCC9136
BCCB8438

Don't see the Right Version?

If you require a particular version, you can look up a specific certificate by the Lot or Batch number.

Search for a COA

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library

Customers Also Viewed

Slide 1 of 2

1 of 2

2,2′-Dihydroxyazobenzene 97%

Sigma-Aldrich

301787

2,2′-Dihydroxyazobenzene

4-Phenylazophenol 98%

Sigma-Aldrich

131083

4-Phenylazophenol

Michael S Scholz et al.
The journal of physical chemistry. A, 121(34), 6413-6419 (2017-08-05)
Because of their high photoisomerization efficiencies, azobenzenes and their functionalized derivatives are used in a broad range of molecular photoswitches. Here, the photochemical properties of the trans isomers of protonated azobenzene (ABH
Fastest thermal isomerization of an azobenzene for nanosecond photoswitching applications under physiological conditions.
Jaume Garcia-Amorós et al.
Angewandte Chemie (International ed. in English), 51(51), 12820-12823 (2012-11-13)
P S Ramanujam et al.
Optics express, 21(2), 1812-1819 (2013-02-08)
We demonstrate a new type of anisotropy in thin films of amorphous azobenzene polymers induced between 570 and 633 nm, where the absorbance in the film is on the order of 0.05. The anisotropy has a pronounced radial contribution. This
Shiki Yagai et al.
Journal of the American Chemical Society, 134(44), 18205-18208 (2012-10-23)
We report a precise control over the hierarchy levels in the outstanding self-organization process shown by chiral azobenzene dimer 1. This compound forms uniform toroidal nanostructures that can hierarchically organize into chiral nanotubes under the control by temperature, concentration, or
Laura Maggini et al.
Nanoscale, 5(2), 634-645 (2012-12-12)
Photothermally responsive supramolecular polymers containing azobenzene units have been synthesised and employed as dispersants for multi-walled carbon nanotubes (MWCNTs) in organic solvents. Upon triggering the trans-cis isomerisation of the supramolecular polymer intermolecular interactions between MWCNTs and the polymer are established
View All Related Papers

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service