Molecular Formula: C₉H₇NO
Molar mass: 145.16 g/mol
EINECS: 274-516-1
Density: 1.188 g/cm³
Flash Point: 200.6 °C
Index of Refraction: 1.595
Boiling Point: 346.7 °C at 760 mmHg
Vapour Pressure: 5.67E-05 mmHg at 25°C
Melting point: 198-199 °C(lit.)
Appearance: White to light purple or purple-brownish powder
Product categories: Quinolines;Hydroxyquinolines
Structure of 2-Quinolinol (59-31-4):
                  
H-Bond Donor: 1
H-Bond Acceptor: 1
IUPAC Name: 1H-quinolin-2-one
Canonical SMILES: C1=CC=C2C(=C1)C=CC(=O)N2
InChI: InChI=1S/C9H7NO/c11-9-6-5-7-3-1-2-4-8(7)10-9/h1-6H,(H,10,11) 
InChIKey: LISFMEBWQUVKPJ-UHFFFAOYSA-N

Carcinogenicity of 2-Quinolinol (59-31-4) hasn't been listed as a carcinogen by NTP, IARC,ACGIH, or CA Prop 65. And its toxicological properties have not been fully investigated.You can see actual entry in RTECS for complete information.

Reported in EPA TSCA Inventory.

Poison by intraperitoneal route. A fungicide. A central nervous system stimulant. When heated to decom
Hazard Note: Harmful/Irritant
Hazard Codes: Xn,Xi
Risk Statements:
20: Harmful by inhalation
21: Harmful in contact with skin
22: Harmful if swallowed
36: Irritating to the eyes
37: Irritating to the respiratory system
38: Irritating to the skin
41:  Risk of serious damage to eyes
Safety Statements:
26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
36: Wear suitable protective clothing
37: Wear suitable gloves
39: Wear eye/face protectionposition it emits toxic fumes of NO_x.

 2-Quinolinol (59-31-4) also can be called for quinolin-2(1H)-one ; carbostyril ; 2(1H)-quinolinone .And, 2-Quinolinol (59-31-4) 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 immediatelyfor at least 15 minutes while removing contaminated clothing. Secondly,Get shoesmedical 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-Quinolinol (59-31-4) is stable.It is not compatible with strong oxidizing agents, strong acids,and you must not take it with incompatible materials.And also prevent it to broken down into hazardous decomposition products: carbon dioxide,carbon monoxide.