arsanes

The saturated hydrides of tervalent arsenic, having the general formula As_nH_n+2 . Individual members having an unbranched arsenic chain are named arsane, diarsane, triarsane, etc. The name of a saturated hydride of arsenic where one or more arsenic atoms have bonding number 5 is formed by prefixing locants and $Math - text$ symbols to the name of the corresponding arsane, e.g. H₂AsAsHAsH₂ triarsane, H₄AsAsH₃AsH₄ 1 $Math - text$ ,2 $Math - text$ ,3 $Math - text$ -triarsane. Hydrocarbyl derivatives of AsH₃ belong to the class arsines.

Source:

PAC, 1995, 67, 1307 (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1319