Fig. 2. Solid-state molecular structure of 4 (30% probability ellipsoids). Hydrogen atoms from the Cp* ligand are omitted for clarity. Selected bond distances (Å) and angles (°): Os1–H1 1.53(4), Os1–H2 1.58(4), Os1–H3 1.51(4), Os1–C1 1.851(3), O1–C1 1.162(4), Os1–Cp*_centroid 1.916(1), C1–Os1–Cp*_centroid 132.5(1).