Phthalazine

  • 2,3-Benzodiazine
  • Benzo[d]pyridazine
  • ,3-Diazanaphthalene
Formula
C8H6N2
Structure
Description
Slightly brown solid.

Registry Numbers and Inventories.
CAS
253-52-1
EC (EINECS/ELINCS)
205-963-2
S 22 24/25
Merck
12,7526
Beilstein/Gmelin
109240
Beilstein Reference
5-23-07-00149
Canada DSL/NDSL
NDSL
US TSCA
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C8H6N2
Formula mass
130.14
Melting point, °C
89 - 91
Boiling point, °C
315
Vapor pressure, mmHg
0.0008 (25 C)
Solubility in water
Soluble
pKa/pKb
10.53 (pKb)
Partition coefficient, pKow
0.46
Heat of vaporization
53.5 kJ/mol
Heat of combustion
-4253 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry place. Store in a tightly closed container.
Handling
Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.
Protection
Eyes: Wear chemical goggles. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear a chemical apron.
Respirators
A NIOSH/MSHA approved air purifying dust or mist respirator or European Standard EN 149.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents.
Decomposition
Nitrogen oxides, carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
163
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.

Health.
Exposure effects
   Ingestion
Expected to be a low ingestion hazard.
   Inhalation
Low hazard for usual industrial handling.
   Skin
Non-irritating to the skin.
   Eyes
No information regarding eye irritation and other potential effects was found.

First aid
 
   Ingestion
Get medical aid. Wash mouth out with water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear.
   Skin
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.