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19624-22-7

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Basic Information
CAS No.: 19624-22-7
Name: Pentaborane
Article Data: 77
Molecular Structure:
Molecular Structure of 19624-22-7 (Pentaborane)
Formula: B5H9
Molecular Weight: 63.1265
Synonyms: Borane(B5H9); Boron hydride (B5H9); Nonahydropentaborane; Pentaborane; Pentaborane(B5H9)
EINECS: 243-194-4
Density: d40 0.61
Melting Point: -46.6°
Boiling Point: bp 60°
Solubility: hydrolyzed if heated [COT88]
Hazard Symbols: Highly flammable, dangerous fire and explosion risk. Toxic by ingestion and inhalation, strong irritant. TLV: 0.005 ppm; STEL 0.013 ppm.
Safety: Poison by inhalation and intraperitoneal routes. Dangerous fire hazard by chemical reaction; spontaneously flammable in air. Dangerous explosion hazard. To fight fire, use special fire-fighting materials; water is not effective; reacts violently with halogenated extinguishing agents. Get instructions from supplier. Explosive reaction with oxygen. Forms shock-sensitive solutions in solvents containing carbonyl, ether, or ester functions; or halogens. Incompatible with dimethyl sulfoxide. Upon decomposition it emits toxic fumes of B. See also BORANES and BORON COMPOUNDS.
PSA: 0.00000
LogP: -3.51020
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Chemistry

Chemistry informtion about Pentaborane(9) (CAS NO.19624-22-7) is:
Synonyms: Pentaborane ; Pentaborane(9)
MF: B5H9
MW: 63.17
EINECS: 243-194-4 
Density: 0.618 g/mL
Melting point: -46.8 °C
Flash point: 30 °C
Boiling point: 60.1 °C
Solubility in water: Reacts with water
Following is the molecular structure of Pentaborane(9) (CAS NO.19624-22-7) is:

Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
dog LC50 inhalation 92mg/m3/15M (92mg/m3) behavioral: tremor behavioral: convulsions or effect on seizure threshold behavioral: ataxia Journal of Pharmacology and Experimental Therapeutics. Vol. 145, Pg. 382, 1964.
dog LDLo intraperitoneal 15800ug/kg (15.8mg/kg) peripheral nerve and sensation: spastic paralysis with or without sensory change behavioral: tremor behavioral: coma "Spravochnik po Toksikologii i Gigienicheskim Normativam Vol. -, Pg. 191, 1999.
monkey LC50 inhalation 640mg/m3/2M (640mg/m3)
behavioral: tremor behavioral: convulsions or effect on seizure threshold behavioral: ataxia
Journal of Pharmacology and Experimental Therapeutics. Vol. 145, Pg. 382, 1964.
mouse LC50 inhalation 3400ppb/4H (3.4ppm)   American Industrial Hygiene Association Journal. Vol. 19, Pg. 46, 1958.
rat LC50 inhalation 6ppm/4H (6ppm)   American Industrial Hygiene Association Journal. Vol. 19, Pg. 46, 1958.
rat LD50 intraperitoneal 11100ug/kg (11.1mg/kg)   "Boron, Metallo-Boron Compounds and Boranes," Adams, R.M., ed., New York, John Wiley & Sons, Inc., 1964Vol. -, Pg. 693, 1964.

Consensus Reports

EPA Extremely Hazardous Substances List. Reported in EPA TSCA Inventory.

Safety Profile

Poison by inhalation and intraperitoneal routes. Dangerous fire hazard by chemical reaction; spontaneously flammable in air. Dangerous explosion hazard. To fight fire, use special fire-fighting materials; water is not effective; reacts violently with halogenated extinguishing agents. Get instructions from supplier. Explosive reaction with oxygen. Forms shock-sensitive solutions in solvents containing carbonyl, ether, or ester functions; or halogens. Incompatible with dimethyl sulfoxide. Upon decomposition it emits toxic fumes of B. See also BORANES and BORON COMPOUNDS
RIDADR: 1380
HazardClass: 4.2
PackingGroup: I

Standards and Recommendations

OSHA PEL: TWA 0.005 ppm; STEL 0.015 ppm
ACGIH TLV: TWA 0.005 ppm; STEL 0.013 ppm
DFG MAK: 0.005 ppm (0.013 mg/m3)
DOT Classification:  4.2; Label: Spontaneously Combustible, Poison

Specification

 Pentaborane(9) (CAS NO.19624-22-7) is a clear colorless liquid with a pungent odor like sour milk. Vapors toxic both under prolonged exposure to low concentrations and short exposure to high concentrations. Under prolonged exposure to intense heat the containers may rupture violently and rocket.It is highly flammable. May ignite spontaneously in air [Merck 11th ed. 1989]. Slowly decomposes in water. Pentaborane(9) is an extremely reactive reducing agent. Can ignite spontaneously in contact with air and many other materials. Reactions with oxygen are often violently explosive. Reacts with ammonia to form a diammoniate. Is stabilized by the formation of complexes with N, O, P, or S. Is stable in hydrocarbon solvents, but forms shock sensitive solutions in most carbonyl containing solvents.It may cause death or permanent injury after very short exposure to small quantities.Ignites spontaneously in air. Reacts violently with halogenated extinguishing agents. Boron hydrides present considerable fire and explosion hazard. They undergo explosive reaction with most oxidizing agents, including halogenated hydrocarbons. Fires tend to reignite. On decomposition, Pentaborane emits toxic fumes and can react vigorously with oxidizing materials. Avoid dimethyl sulfoxide, water, most oxidizing agents (including halogenated hydrocarbons). Avoid direct sunlight and sources of ignition, decomposes very slowly at 302. Hazardous polymerization may not occur.