Phosphorothioic chloride difluoride or thiophosphoryl chloride difluoride is a chemical compound with formula . It is normally found as a gas boiling at 6.3 °C and melting at −155.2 °C. The density of the gas at standard conditions is 5.579 g/L.

Critical pressure In thermodynamics, a critical point (or critical state) is the end point of a phase equilibrium curve. The most prominent example is the liquid–vapor critical point, the end point of the pressure–temperature curve that designates conditions ...

is 41.4 bars, and

critical temperature Critical or Critically may refer to: *Critical, or critical but stable, medical states **Critical, or intensive care medicine *Critical juncture, a discontinuous change studied in the social sciences. *Critical Software, a company specializing in ...

is 439.2 K.

Production

Phosphorothioic chloride difluoride was made in 1940 by reacting with and at 75 °C. In another reaction reacts with to make ,

KCl Potassium chloride (KCl, or potassium salt) is a metal halide Salt (chemistry), salt composed of potassium and chlorine. It is odorless and has a white or colorless vitreous lustre, vitreous crystal appearance. The solid dissolves readily in wa ...

and , but also partly yields . A small percentage of is formed when or reacts with chlorine. It can be formed from difluoro(germylthio)phosphine: :

Properties

Although phosphorothioic chloride difluoride does not spontaneously ignite in air, mixtures with air are explosive. The gas is hydrolysed slowly by water vapour. It also reacts with

potassium hydroxide Potassium hydroxide is an inorganic compound with the formula K OH, and is commonly called caustic potash. Along with sodium hydroxide (NaOH), KOH is a prototypical strong base. It has many industrial and niche applications, most of which exp ...

solution.

Heat of vaporization The enthalpy of vaporization (symbol ), also known as the (latent) heat of vaporization or heat of evaporation, is the amount of energy (enthalpy) that must be added to a liquid substance to transform a quantity of that substance into a gas. T ...

is 5703 cal/mol. Infrared bands in the gas are at 946, 920, 738, 541, 395, 361, 317, missed, and 198 cm⁻¹. In liquid, a

Raman spectroscopy Raman spectroscopy () (named after Indian physicist C. V. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules, although rotational and other low-frequency modes of systems may also be observed. Raman sp ...

has bands at 939, 913, 727, 536, 394, 359, 314, 251, 207. These are for symmetric stretch in a' and a'' symmetry, PS stretch, PCl stretch, PCl bend, scissor, rock, PS op-bend, and PS ip-bend. The

nuclear magnetic resonance Nuclear magnetic resonance (NMR) is a physical phenomenon in which nuclei in a strong constant magnetic field are perturbed by a weak oscillating magnetic field (in the near field) and respond by producing an electromagnetic signal with a ...

coupling constants for are 1220. It is a triplet line with intensities 1:2:1. The chemical shift from

orthophosphoric acid Phosphoric acid (orthophosphoric acid, monophosphoric acid or phosphoric(V) acid) is a colorless, odorless phosphorus-containing solid, and inorganic compound with the chemical formula . It is commonly encountered as an 85% aqueous solution, w ...

is −50×10⁻⁶. For the coupling constant is 1218. It is a doublet line in ratio 1:1. The chemical shift from is −15.9×10⁻⁶.

References

{{Reflist Phosphorus halides Thiophosphoryl compounds