Bridging ligands oxygen

At this point, we can schematically represent the structure of Cr(II) sites as (SiO)2Cr L , where L represents a weak ligand (oxygen of a SiOSi bridge) and n is a not fully known figure which increases upon activation at high temperature. The adsorption of CO at room temperature on grafted Cr(II) sites... 

Figure 2 The molecular dynamics simulation picture of [Gd(DOTA)(H20)] in aqueous solution shows the inner sphere water, directly bound to the metal (its oxygen is dark) the second sphere water molecules, bound to the carboxylates of the ligand through hydrogen bridges (their oxygens are gray) and outer sphere or bulk water molecules without preferential orientation (in white).

Tri- and tetrametaphosphimates can act as polydentate ions. In principle, coordination by both nitrogen and oxygen is possible, but as seen in the salts of monovalent cations, almost exclusively coordination via oxygen is expected. Thus, the anions can act as polydentate and/or bridging ligands. The trimetaphosphimate ion can act in various ways ... 

Bertrand, J. A. and Eller, P. G., Polynuclear Complexes with Aminoalcohols and Iminoalcohols as Ligands Oxygen-Bridged and Hydrogen-Bonded Species 21 29... 

The Type 1 copper ions are normally coordinated by three strong ligands, a cysteine and two histidines, and often have one or two weaker ligands such as methionine sulfur or oxygen. Type 3 coppers are usually each coordinated by three histidines, with a bridging ligand such as oxygen or hydroxyl anion. 

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