In the D2h structure of diborane, three-center-two electron bonds allow two of the hydrogens to act as these components.
Noro and Nakamura et al synthesized a neutral one of these called bpdo to form porous polymers of calcium and magnesium. In the oxygen-evolving complex, O5 acts as an exchangeable one of these components. These components are usually designated by a mu with a subscript denoting connectivity. Pyrazine acts as one of these things in a compound used to study inner-sphere electron transfers named for Creutz and Taube. PdCl2 can form infinite chains due to Cl acting as one of these components. Carbonyls adopting this role typically show a 100-200 inverse centimeter downshift in IR spectroscopy relative to their (*) terminal counterparts. When hydrogen acts as one of these components, making a normal electron count is impossible, and these components are counted as LX, with X for the sigma interaction and L for the donor bond. In the D2h structure of diborane, three-center-two electron bonds allow two of the hydrogens to act as these components. For 10 points, name this type of ligand that is bonded to two metal atoms.
Noro and Nakamura et al synthesized a neutral one of these called bpdo to form porous polymers of calcium and magnesium.
bridging ligand [prompt on ligand]