3-Methyl-4-nitropyridine N-Oxide Property

Melting point:

135-139 °C

Boiling point:

277.46°C (rough estimate)

Density 

1.4564 (rough estimate)

refractive index 

1.5100 (estimate)

storage temp. 

2-8°C

pka

-1.22±0.10(Predicted)

form 

Crystalline Needles or Powder

color 

Yellow

BRN 

140157

InChI

InChI=1S/C6H6N2O3/c1-5-4-7(9)3-2-6(5)8(10)11/h2-4H,1H3

InChIKey

SSOURMYKACOBIV-UHFFFAOYSA-N

SMILES

C1[N+]([O-])=CC=C([N+]([O-])=O)C=1C

CAS DataBase Reference

1074-98-2(CAS DataBase Reference)

NIST Chemistry Reference

4-Nitro-3-picoline-n-oxide(1074-98-2)

Safety

Hazard Codes 

Xn,Xi

Risk Statements 

40-20/21/22-36/37/38

Safety Statements 

45-36/37-36-26-22

RIDADR 

2811

WGK Germany 

3

RTECS 

UT5775000

Hazard Note 

Irritant/Possible Mutagen

HazardClass 

6.1

PackingGroup 

II

HS Code 

29333990

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

H351Suspected of causing cancer

Precautionary statements

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P308+P313IF exposed or concerned: Get medical advice/attention.

3-Methyl-4-nitropyridine N-Oxide Chemical Properties,Usage,Production

Chemical Properties

yellow crystalline needles or powder

General Description

3-Methyl-4-nitropyridine N-Oxide (POM) is an efficient nonlinear optical organic material having a high nonlinear coefficient and achieving the parametric emission process within the desired spectral range (1–2 μm). POM crystallizes in the orthorhombic class, space group P2₁2₁2₁, and point group 222. It is a positive biaxial crystal. It melts at 136°C and the nonlinear coefficient is deff=10 pm/V[1]. This compound exhibits a negative-linear-compressibility (NLC) region as well as exceptionally large positive thermal expansion. The initial compression of the weak supramolecular network in the molecular POM crystal is analogous to the hydrostatic responses of the framework crystals with much stronger cohesion forces. 3-Methyl-4-nitropyridine N-Oxide is a commercial NLO material for pico- and femtosecond optics in the near-IR range[2].

Synthesis

Nitration of picoline-N-oxide in the fourth position yields 3-Methyl-4-nitropyridine N-Oxide. Initially, Picoline-N-oxide (50 g) was melted at 38C and mixed with sulfuric acid (250 ml) in cold condition. Later, nitration of this mixture was done at room temperature by addition of sodium nitrate (70 g) and the solution was continuously stirred until all the solid particles dissolves. Temperature was increased slowly to 70C by keeping it in an oil bath and solution was stirred continuously for 2 h at this temperature. To ensure complete nitration, the solution was maintained about 95–100C for 12 h with continuous stirring. The reaction mixture was taken out from the oil bath and cooled. It is then poured over crushed ice and neutralized with ammonia solution till the pH reaches about 7–8. On cooling, bright yellow crystalline 3-Methyl-4-nitropyridine N-Oxide powder was obtained. It was washed and dried in vacuum[1].

References

[1] Boomadevi, S. , H. P. Mittal , and R. Dhansekaran . "Synthesis, crystal growth and characterization of 3-methyl 4-nitropyridine 1-oxide (POM) single crystals."Journal of Crystal Growth 261.1(2004):55-62.
[2] Cai, Weizhao , et al. "Anomalous compression of a weakly CHO bonded nonlinear optical molecular crystal." Journal of Materials Chemistry C 2.32(2014).