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| CAS No.: | 7787-52-2 |
|---|---|
| Name: | Beryllium hydride. |
| Article Data: | 3 |
| Molecular Structure: | |
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| Formula: | BeH2 |
| Molecular Weight: | 11.03 |
| Synonyms: | beryllium dihydride;Dihydrogen beryllium salt;beryllium hydride; |
| Density: | 0.650 |
| Solubility: | reacts slowly with H2O, rapidly with dilute acids evolving H2(g) [MER06] |
| Safety: | Confirmed carcinogen. A dangerous fire hazard. When heated to 220°C it liberates explosive hydrogen gas. Reacts violently with methanol, water, and dilute acids. When heated to decomposition it emits toxic fumes of BeO. See BERYLLIUM COMPOUNDS and HYDRIDES. |
| PSA: | 0.00000 |
| LogP: | 0.00000 |
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Chemistry
IUPAC Name: beryllium hydride
CAS NO: 7787-52-2
Molecular Formula Beryllium hydride (CAS NO.7787-52-2): H2Be
Molecular Weight: 11.0281
Molecular Structure:
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Production
The purest beryllium hydride is obtained by the reaction of triphenylphosphine, PPh3, with beryllium borohydride, Be(BH4)2.
Be(BH4)2 + 2PPh3 → 2Ph3PBH3 + BeH2
BeH2 was first synthesised in 1951 by reacting dimethylberyllium, Be(CH3)2, with lithium aluminium hydride, LiAlH4.Purer BeH2 forms from the pyrolysis of di-tert-butylberyllium, Be(C(CH3)3)2 at 210 °C.
Consensus Reports
IARC Cancer Review: Group 1 IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 58 (1993),p. 41.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Human Sufficient Evidence IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 58 (1993),p. 41.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Sufficient Evidence IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 1 (1972),p. 17.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Sufficient Evidence IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 23 (1980),p. 143.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Sufficient Evidence IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 58 (1993),p. 41.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) . Beryllium and its compounds are on the Community Right-To-Know List.
Safety Profile
RIDADR: 1409
HazardClass: 4.3
PackingGroup: II
Confirmed carcinogen. A dangerous fire hazard. When heated to 220°C it liberates explosive hydrogen gas. Reacts violently with methanol, water, and dilute acids. When heated to decomposition it emits toxic fumes of BeO. See BERYLLIUM COMPOUNDS and HYDRIDES.
Standards and Recommendations
OSHA PEL: TWA 0.002 mg(Be)/m3; STEL 0.005 mg(Be)/m3/30M; CL 0.025 mg(Be)/m3
ACGIH TLV: TWA 0.002 mg(Be)/m3; Confirmed Human Carcinogen; (Proposed: TWA 0.0002 mg(Be)/m3 (sensitizer); Confirmed Human Carcinogen); 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.
NIOSH REL: (Beryllium) CL not to exceed 0.0005 mg(Be)/m3