Hydrogen deuteride

Its proper molecular formula is 1H2H, but for simplification, it is usually written as HD.

In the laboratory it is produced by treating sodium hydride with deuterated water:[1] Hydrogen deuteride is a minor component of naturally occurring molecular hydrogen.

It is one of the minor but noticeable components of the atmospheres of all the giant planets, with abundances from about 30 ppm to about 200 ppm.

HD has also been found in supernova remnants,[2] and other sources.

[6] The frequency of the astronomically important J = 1-0 rotational transition of HD at 2.7 THz has been measured with tunable FIR radiation with an accuracy of 150 kHz.

Skeletal formula of hydrogen deuteride
Skeletal formula of hydrogen deuteride
NFPA 704 four-colored diamond Health 0: Exposure under fire conditions would offer no hazard beyond that of ordinary combustible material. E.g. sodium chloride Flammability 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g. propane Instability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogen Special hazards (white): no code
H NMR spectrum of a solution of HD (labeled with red bars) and H 2 (blue bar). The 1:1:1 triplet arises from the coupling of the 1 H nucleus ( I = 1/2) to the 2 H nucleus ( I = 1).