Molecule structure of Dinitrobenzene(CAS NO.25154-54-5) :

Molecular Weight: 168.10696 g/mol
Molecular Formula: C₆H₄N₂O₄
Density: 1.486 g/cm³ 
Boiling Point: 319.9 °C at 760 mmHg 
Flash Point: 169.2 °C
Index of Refraction: 1.612
Molar Refractivity: 39.34 cm³
Molar Volume: 113.1 cm³
Polarizability: 15.59810^-24 cm³
Surface Tension: 62.6 dyne/cm 
Enthalpy of Vaporization: 53.92 kJ/mol 
log P (octanol-water): 1.630 
Water Solubility: 500 mg/L 
Vapor Pressure: 1.03E-03 mm Hg
Henry's Law Constant: 8.39E-08 atm-m³/mole 
Atmospheric OH Rate Constant: 2.13E-14 cm³/molecule-sec 
EINECS: 246-673-6

Suspected carcinogen. A poison. When heated to decomposition it emits toxic fumes of NO_x. See also o-DINITROBENZENE.
RIDADR: 1597
HazardClass: 6.1(a)
PackingGroup: II

OSHA PEL: TWA 1 mg/m³ (skin)
ACGIH TLV: TWA 0.15 ppm (skin)
DFG MAK: Confirmed Animal Carcinogen with Unknown Relevance to Humans
DOT Classification:  6.1; Label: Poison

 Dinitrobenzene(CAS NO.25154-54-5) is also called Dinitrobenzenes ; Benzene, dinitro- ; DNB ; Dinitrobenzol ; HSDB 6371 . One or more of the three isomeric (1,2- 1,3- and 1,4-) dinitrobenzenes, which are solids at room conditions, presumably in a non-aqueous solvent or carrier. Exposure of the confined material to heat or shock may result in explosive decomposition. It will produce toxic oxides of nitrogen during combustion. Dinitrobenzene(CAS NO.25154-54-5) may react vigorously with oxidizing materials. Reaction with nitric acid (nitration) leads to a mixture of trinitrobenzenes possessing high-explosive properties. If heat and reaction conditions of the nitration are not controlled, detonation comparable to that of TNT may occur. A mixture of 1,3-dinitrobenzene with tetranitromethane can be highly explosive. 1,2-dinitrobenzene is a severe explosion hazard when shocked or exposed to heat or flame. Dinitrobenzene(CAS NO.25154-54-5) is highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.  It may burn but does not ignite readily. Containers may explode when heated. Runoff may pollute waterways. Substance may be transported in a molten form.