Trimethylarsonium iodide

Abstract

The title compound, C3H10As+·I−, contains discrete [(CH3)3AsH]+ cations with a distorted tetra­hedral geometry for the central As atom, which lies on a mirror plane. Weak van der Waals contacts are observed between the I atom and the H atoms in the range 3.15 (1)–3.25 (1) Å.

Molecular Main Group Metal Hydrides

“…While [R 4– n PnH n ] + (Pn = Group 15 element) cations are commonly encountered bonding motifs for nitrogen and phosphorus, their heavy analogues are far more rare. The cations [Me 3 AsH] + and [ t BuAsH 3 ] + remain the only structurally authenticated examples of As–H containing arsonium ions reported to date. , While no bismuth analogues are known, the first example of an antimony­(V) cation bearing an Sb–H bond was reported in 2017 by Tan, Wang and coworkers. These researchers first prepared the antimony-centered radical cation [Trip 3 Sb •+ ]­[BAr F 4 ] ( 1172 ), then combined this species with n Bu 3 SnH to induce a hydrogen atom abstraction reaction to generate the tetrahedral hydrostibonium cation [Trip 3 SbH]­[BAr F 4 ] ( 1173 ) [Ar F = 3,5-(F 3 C) 2 C 6 H 3 ], which was recovered in a 42% yield (eq 99 ).…”