Synthesis and Characterization of Novel M−Hg−M (M = Cr, Mo, W) Heterotrimetallic Complexes Bridged by a Functionally Substituted Bis(cyclopentadienyl) Ligand. Crystal and Molecular Structure of [Mo(CO) <sub/>3</sub> (η ⁵ -C <sub/>5</sub> H <sub/>4</sub> CH <sub/>2</sub> CH <sub/>2</sub> OCH <sub/>2</sub> CH <sub/>2</sub> C <sub/>5</sub> H <sub/>4</sub> -η ⁵ )(CO) <sub/>3</sub> Mo]HgSong, Li-Cheng; Dong, Yu-Bin; Hu, Qing-Mei; Sun, Jie · Organometallics · 1996