Trimethylborane

Structural formula
General
Surname	Trimethylborane
other names	TMB; Boron trimethyl;
Molecular formula	C 3 H 9 B
Brief description	colorless gas
External identifiers / databases
EC number	209-816-3
ECHA InfoCard	100.008.926
PubChem	68979
Wikidata	Q7842211
properties
Molar mass	55.92 g mol −1
Physical state	gaseous
density	2.318 g l −1 (21.1˚C)
Melting point	−161.5 ° C
boiling point	−20.2 ° C
safety instructions
H and P phrases	H: 220-280-314
	P: 280-305 + 351 + 338-310-410 + 403
Thermodynamic properties
ΔH f 0	−124.3 kJ / mol
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Trimethylborane is a chemical compound from the group of organic boron compounds .

Extraction and presentation

Trimethylborane can be obtained by reacting a methyl Grignard reagent with boron trifluoride in a di-n-butyl ether solution under a nitrogen atmosphere . It is also commonly represented in the form of its ammonia adduct, NH ₃ : B (CH ₃ ) ₃ .

properties

Trimethylborane is a self-igniting colorless gas that reacts violently with water. It decomposes when heated, whereby carbon dioxide , carbon monoxide , borane and boron oxides can be formed in the air .

The bond length is 157.8 pm (C – B) or 111.4 pm (C – H). The bond angle is 120 ° (CBC) or 112.5 ° (BCH).

use

Trimethylborane is used as a precursor for boron carbide hard metal thin films by chemical vapor deposition . It also serves as a boron source in the deposition of borophosphosilicate glass (BPSG).

Individual evidence

↑ ^a ^b ^c ^d ^e ^f Entry on trimethylborane in the GESTIS substance database of the IFA , accessed on February 1, 2016(JavaScript required) .
↑ Arkonic: TRIMETHYLBORON
↑ ^a ^b Data sheet Trimethylboron, electronic grade, ≥98.35% from Sigma-Aldrich , accessed on January 28, 2014 ( PDF ).
↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Standard Thermodynamic Properties of Chemical Substances, pp. 5-25.
↑ Ross, Gaylon S .; Enagonio, Delmo; Hewitt, Clifford A .; Glasgow, Augustus R .: Preparation of high purity trimethylborane , Journal of Research of the National Bureau of Standards, 1962, Vol. 66A, No. 1, p. 59
↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Structure of Free Molecules in the Gas Phase, pp. 9-46.

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f Entry on trimethylborane in the GESTIS substance database of the IFA , accessed on February 1, 2016(JavaScript required) .

[arkonic-2] Arkonic: TRIMETHYLBORON

[Sigma-3] Data sheet Trimethylboron, electronic grade, ≥98.35% from Sigma-Aldrich , accessed on January 28, 2014 ( PDF ).

[CRC90_5_25-4] David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Standard Thermodynamic Properties of Chemical Substances, pp. 5-25.

[5] Ross, Gaylon S .; Enagonio, Delmo; Hewitt, Clifford A .; Glasgow, Augustus R .: Preparation of high purity trimethylborane , Journal of Research of the National Bureau of Standards, 1962, Vol. 66A, No. 1, p. 59

[CRC90_9_46-6] David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Structure of Free Molecules in the Gas Phase, pp. 9-46.