Abstract
The cover picture shows the crystal structure of a diiron hexacarbonyl complex containing bridging phenanthrene‐4,5‐dithiolate ligand. The complex is a model for the active site of the [Fe–Fe] hydrogenase enzyme. From the X‐ray crystallographic studies, the complex is butterfly shaped with an Fe–Fe bond distance of 2.5365 Å close to that of the enzyme (2.6 Å). The infrared spectrum of the complex (top left) contains three peaks at 2001, 2040, and 2075 cm−1 corresponding to ν(CO). The cyclic voltammogram of the complex (bottom right) contains one quasi‐irreversible reduction (E1/2 = −0.84 V vs Ag/AgCl) tentatively assigned to the one‐electron transfer process; [FeI–FeI] → [FeI–Fe0]. More details are discussed in the Article by C. Mebi et al. on pp. 2550 ff.
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