Structure of 2,4'-Difluorobenzophenone (CAS NO.342-25-6):

IUPAC Name: (2-fluorophenyl)-(4-fluorophenyl)methanone 
Empirical Formula: C₁₃H₈F₂O
Molecular Weight: 218.1988 
EINECS: 206-441-7 
Index of Refraction: 1.549
Molar Refractivity: 56.03 cm³
Molar Volume: 175.9 cm³
Polarizability: 22.21×10^-24cm³
Surface Tension: 39.5 dyne/cm
Density: 1.239 g/cm³
Flash Point: 126.8 °C
Enthalpy of Vaporization: 54.92 kJ/mol 
Melting Point: 22-24 °C(lit.)
Boiling Point: 308.6 °C at 760 mmHg
Vapour Pressure: 0.000676 mmHg at 25°C 
Physical Appearance: clear light yellow liquid after melting
Product Categories: Acetophenone Series;Aromatic Benzophenones & Derivatives (substituted);Benzophenones (for High-Performance Polymer Research);Functional Materials;Reagent for High-Performance Polymer Research 
Synonyms of 2,4'-Difluorobenzophenone (CAS NO.342-25-6): Methanone,(2-fluorophenyl)(4-fluorophenyl)-

Hazard Codes: Xi
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-37/39-24/25 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S37/39:Wear suitable gloves and eye/face protection. 
S24/25:Avoid contact with skin and eyes.
WGK Germany: 3
Hazard Note: Irritant
HazardClass: IRRITANT