Inner sphere complex
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Inner sphere complex at the solid-water interface is a type of surface complex that refers to the solid-water interface between water, the solute, and sorbent. Formation of inner sphere complexes occurs when ions bind directly to the surface with no intervening water molecules. These types of surface complexes are restricted to ions that have a high affinity for surface sites and include specifically adsorbed ions that can bind to the surface through covalent bonding.
Inner Sphere Complexes
Inner sphere complexes describe active surface sites that are involved in nucleation, crystal growth, redox processes, soil chemistry, alongside other reactions taking place between a cation and surface.[1]
However, inner sphere complexes have surface hydroxyl groups that function as -donor ligands, increasing the coordinated metal ion's electron density.[2] This is an example of competitive complex formation, in which ligands will compete for space on an activation site of a metal ion.
Surface structure are able to reduce and oxidize ligands, whereas transport phenomena do not. Therefore, surface structure serves an important role in surface reactivity, with the coordination environment at the solid-water interface changing intensity or rate of a reaction.
References
- ^ Huntsberger, J. R. (May 1, 1975). "Surface Chemistry and Adhesion- A Review of Some Fundamentals". Journal of Adhesion. 7: 289–299.
- ^ Stumm, Werner (May 5, 1995). "The Inner-Sphere Surface Complex A Key to Understanding Surface Reactivity". American Chemistry Society Publications. 244: 1–32 – via ACS Publications.
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