Line drawing of the anionic complex 2 (left) illustrating the intramolecular H-bond between O2 and N8 in the molecular structure (right) with 50% probability ellipsoids. H-atoms are depicted with arbitrary radii. Countercation (Et4N) and disordered solvent molecules are omitted for clarity. Selected bond distances (Å) for 2: Mo1-O1 1.718(3), Mo1-S1 2.3655(9), Mo-S2 2.3622(10), S1- C16 1.794(3), S2-C17 1.776(3), C16-C17 1.344(5), C16-C21 1.480(4), N8-C21 1.319(4), C21-C22 1.426(5), N7-C22 1.318(5), N8-O2 2.768(5).