Molecular structures of [K(2,2,2‐crypt)][2 a]⋅1.5 tol (left) and [K(18‐crown‐6)][2 b]⋅THF (right). Thermal ellipsoids pictured at 50 % probability level; [K(2,2,2‐crypt)]+/[ K(18‐crown‐6)]+, solvent of crystallisation and hydrogen atoms omitted for clarity. Selected interatomic distances [Å] and angles [°]; 2 a: P1−N1 1.759(2), P1−O1 1.830(1), P1−O2 1.978(1), P1−O3 1.652(1), O1‐P1‐O2 166.93(6), O1‐P1‐O3 93.79(7), O2‐P1‐O3 92.30(7), N1‐P1‐O1 84.96(6), N1‐P1‐O2 82.99(6), N1‐P1‐O3 95.03(7), C6‐N1‐C20 126.96(14), C6‐N1‐P1 114.19(11), C20‐N1‐P1 118.21(11). 2 b: As1−N1 1.898(1), As1−O1 2.028(1), As1−O2 1.963(1), As1−O3 1.820(1), O1‐As1‐O2 162.95(4), O1‐As1‐O3 92.94(4), O2‐As1‐O3 93.31(4), N1‐As1‐O1 81.38(4), N1‐As1‐O2 82.40(4), N1‐As1‐O3 93.64(4), C6‐N1‐C20 127.76(10), C6‐N1‐As1 115.56(8), C20‐N1‐As1 114.11(8).