A General Synthesis of Phosphorus‐ and Arsenic‐Containing Analogues of the Thio‐ and Seleno‐cyanate Anions

A general synthetic protocol for the synthesis of phosphorus‐ and arsenic‐containing analogues of the thio‐ and seleno‐cyanate anions is reported. This procedure allows for the isolation of three unprecedented species: the phosphaethynselenolate, PCSe − ( 1 ), the arsaethynthiolate, AsCS − ( 2 ), and the arsaethynselenolate, AsCSe − ( 3 ), anions. The structures, electronic properties, and spectroscopic signatures of these species are reported.