Rapid and Simple Isolation of the Crystalline Molybdenum‐Blue Compounds with Discrete and Linked Nanosized Ring‐Shaped Anions: Na 15 MoMoO 462 H 14 (H 2 O) 70 0.5 MoMoO 457 H 14 (H 2 O) 68 0.5 · ca. 400 H 2 O and Na 22 MoMoO 442 H 14 (H 2 O) 58 · ca. 250 H 2 O