Line drawing of the anionic complex, 4 (left), corresponding to the molecular diagram and labeling scheme (right) with 50% probability ellipsoids. Steric repulsion from the t-butyl in 4 forces the quinoxaline to rotate out of plane with respect to the dithiolene. H-atoms are depicted with arbitrary radii. Countercation (Et4N) and disordered solvent molecules are omitted for clarity. Selected bond distances (Å) for 4: Mo1-O1 1.688(2), Mo1-S1 2.3733(9), Mo-S2 2.3624(10), S1-C16 1.804(4), S2-C17 1.799(4), C16-C17 1.332(5), C16-C18 1.477(5), N7-C18 1.305(4), C18-C19 1.428(5), N8-C19 1.319(5).