“…The bridging hydride ligand, which occupies a distinct coordination site, has not been located, and is believed to be at the position trans to the Re1-C2 and Re2-C6 bonds, forming a two-electron three-centered bond to the two rhenium atoms. The Re1⋯Re2 distance (3.337 Å) is comparable with (μ-H)Re 2 (CO) 8 (μ-SC 12 H 7 ) (3.345 Å), 12 but is substantially longer than those measured for (μ-H)Re 2 (CO) 8 (μ-PBu t 2 ) (3.1291(2) Å), 13 (μ-H)Re 2 (CO) 8 (μ-SC 6 H 11 ) (3.093(1) Å), 14 and (μ-H)Re 2 (CO) 8 (μ-PFu 2 ) (3.1571(3) Å). 15 For comparison, the Re-Re single bond distance is 3.041(1) Å in Re 2 (CO) 10 .…”