Antimony pentachloride is a the chemical compound with the formula SbCl5. It is a toxic and very corrosive substance, and fumes in moist air.

Arsenic pentachloride is a chemical compound of arsenic and chlorine [1]. This compound was first prepared in 1976 through the UV irradiation of arsenic trichloride, AsCl3, in liquid chlorine at −105°C[2]. AsCl5 decomposes at around −50°C. The structure of the solid was finally determined in 2001[3].

Causes severe irritation and burns. May Be harmful if swallowed. Avoid breathing vapor or dust. Use with adequate ventilation. Avoid contact with eyes, skin, and clothes. Wash thoroughly after handling. Keep container closed

Molybdenum(V) chloride is the inorganic compound with the formula [MoCl5]2. This dark volatile solid is an important starting reagent in the preparation of molybdenum compounds. In the solid state molybdenum pentachloride exists as a dimer with the formula Mo2Cl10, with a structure similar to that of the corresponding pentachlorides of W, Nb and Ta. In the gas phase, it is a monomeric pentahalide.

Niobium(V) chloride, also known as niobium pentachloride, is a yellow crystalline solid often used as a starting material in niobium chemistry. It is prepared by heating niobium metal in chlorine. It is often contaminated with small amounts of niobium(V) oxychloride, NbOCl3, formed by hydrolysis or from traces of oxygen during the preparation.

Phosphorus pentachloride is the chemical compound with the formula pcl5. It is one of the most important phosphorus chlorides, others being pcl3 and pocl3. Pcl5 finds use as a chlorinating reagent.