Cyaarside, also called cyarside, is the anion. Featuring a triple bond between arsenic and carbon, it is the arsenic analogue of cyanide and cyaphide.
An actinide cyaarside complex can be prepared by CâÂÂO bond cleavage of the arsaethynolate anion , the arsenic analogue of cyanate and phosphaethynolate. Reaction of the uranium complex [] with one molar equivalent of [ in the presence of 2.2.2-cryptand results in the formation of a dinuclear, oxo-bridged uranium complex featuring a Câ¡As ligand.