In inorganic chemistry, transition metal oxy chloride complexes are coordination complexes that consists of a transition metal coordinated to chloride and oxide ligands. These complexes are molecular (discrete) in contrast to the ternary phase metal oxychloride. The class of complexes is extensive.
Bonding Chloride and oxide are X-type ligands in coordination chemistry. Chloride is both σ-donor and a weak π-donor. Oxide is strong σ-donor and a strong π-donor. Both occur as terminal ligand and a bridging ligand.
Molecular M-O-Cl complexes A selection of transition metal oxochloride complexes.Greenwood & Earnshaw, Chapters 22–25, section halides and oxohalides Metal examples comment Ti , exclusively Ti(IV) V , exclusively V(V), is polymeric Ta Cr , exclusively Cr(VI) Mo , exclusively Mo(VI) W , exclusively W(VI) Re , seeFe [Fe2OCl6]2-μ corner-shared bitetrahedral Ru Li+ saltcorner-shared biooctahedral Os NH4+)4 salt osmium oxides are numerous, exception to the pattern that terminal oxo ligands are associated with d0 metal centers.
The compounds and (M = W, Ru, Os) have two groups joined by a bridging oxygen atom.Housectroft & Sharpe, Figure 22.5. Each metal has an octahedral environment. The linear structure can be rationalized in terms of molecular orbital theory, indicating the presence of dπ — pπ bonding between the metal and oxygen atoms.Housectroft & Sharpe, Figure 22.15.
References