Empirical Formula: C₁₃H₇NO₃
Molecular Weight: 225.1996 g/mol
Index of Refraction: 1.698 
Density: 1.437 g/cm³
Flash Point: 215.1 °C
Enthalpy of Vaporization: 67.27 kJ/mol
Boiling Point: 419 °C at 760 mmHg
Vapour Pressure: 3.13E-07 mmHg at 25 °C
Melting point: 222-223 °C(lit.)
Appearance: Bright yellow needles
Structure of 2-Nitro-9-fluorenone (CAS NO.3096-52-4):
                       
IUPAC Name: 2-Nitrofluoren-9-one
Product Category of 2-Nitro-9-fluorenone (CAS NO.3096-52-4): Fluorenes & Fluorenones;Carbonyl Compounds;Ketones

2-Nitro-9-fluorenone (CAS NO.3096-52-4) hasn't been listed as a carcinogen by NTP, IARC, ACGIH, or CA Prop 65. And the toxicological properties have not been fully investigated. You can see actual entry in RTECS for complete information.

Mutation data reported. When heated to decomposition it emits toxic vapors of NO_x.
Hazard Codes: Xi
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-37/39 
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.

 2-Nitro-9-fluorenone , its cas register number is 3096-52-4. It also can be called 2-Nitrofluoren-9-one ; and 2-Nitrofluorenone . It is hazardous, so the first aid measures and others should be known. Such as: When on the skin: first, should flush skin with plenty of water immediately for at least 15 minutes while removing contaminated clothing. Secondly, get medical aid. Or in the eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Then get medical aid soon. While, it's inhaled: Remove from exposure and move to fresh air immediately. Give artificial respiration while not breathing. When breathing is difficult, give oxygen. And as soon as to get medical aid. Then you have the ingesting of the product: Wash mouth out with water, and get medical aid immediately. Notes to physician: Treat supportively and symptomatically.
In addition, 2-Nitro-9-fluorenone (CAS NO.3096-52-4) is not compatible with strong oxidizing agents, and you must not take it with incompatible materials. And also prevent it to broken down into hazardous decomposition products: nitrogen oxides, carbon monoxide, carbon dioxide.