Molecular Structure of Ammonium hexafluorovanadate (CAS NO. 13815-31-1):

IUPAC Name: triazanium vanadium hexafluoride
Empirical Formula: H₁₂F₆N₃V 
Molecular Weight: 219.0489 
Melting point: >300 °C(lit.) 
H bond acceptors: 1
H bond donors: 3
Freely Rotating Bonds: 0 
Smiles
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Product Categories: Ammonium SaltsChemical Synthesis; Catalysis and Inorganic Chemistry; Metal and Ceramic Science; Salts; Vanadium

Poison by intravenous route. See also FLUORIDES and VANADIUM COMPOUNDS. When heated to decomposition it emits very toxic NH₃, NO_x, VO_x, and fluorides.

Hazard Codes T
Risk Statements 23/24/25-36 
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed. 
R36:Irritating to eyes.
Safety Statements 26-36/37/39-45 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)

OSHA PEL: TWA 2.5 mg(F)/m³
ACGIH TLV: TWA 2.5 mg(F)/m³; BEI: 3 mg/g creatinine of fluorides in urine prior to shift; 10 mg/g creatinine of fluorides in urine at end of shift; TWA 0.05 mg(V₂O₅)/m³
NIOSH REL: (Vanadium Compounds) CL 0.05 mg(V)/m³/15M

 Ammonium hexafluorovanadate , its CAS number is 13815-31-1, it can be called ammoniumhexafluorovanadate ; hexafluoro-vanadate(3-triammoniumsalt ; triammonium,(oc-6-11)-vanadate(3-hexafluoro- ; triammoniumhexafluorovanadate(3-) . It is a toxic substance, with flammability, burning will produce toxic fluoride, nitrogen oxide, vanadium oxide and ammonia fumes, so it should be stored in cool and dry environment, dry powder, foam, sand, carbon dioxide, water mist can be used if something urgent happened.