Abstract: | Pseudohalogeno Metal Compounds. LXXVII. Structure of Hexafulminatocobaltate(III), Co(CNO)6]3– In the crystal of AsPh4]3Co(CNO)6] the hexafulminatocobaltate(III) anion forms an ideal octahedron with linear C≡N–O ligands and with relatively short cobalt‐carbon bonds (Co–C 191 pm). In the crystal the AsPh4]+ cations “dilute” the energy rich anions. |