Trimethylborane

• TMB
• Bortrimethyl

Colorless gas

Gaseous

2.318 g · l -1 ( 21.1 ˚ C)

-161.5 ° C

-20.2 ° C

Risk

-124.3 KJ / mol

Template: Infobox chemical / molecular formula search available

Trimethylborane is a chemical compound from the group of organoboron compounds.

Production and representation

Trimethylborane can be obtained under a nitrogen atmosphere by reaction of a methyl Grignard reagent with boron trifluoride in a di-n- butyl ether solution. It is usually in the form of its ammonia adduct NH3: presented B (CH3) 3.

Properties

Trimethylborane is a pyrophoric colorless gas that reacts violently with water. It decomposes on heating, which may result in air carbon monoxide and dioxide, borane and boron oxides.

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

Use

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