Lecture 12 - bind to soft bases. Theory and Hard and Soft...

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1 Chem 172 Advanced Inorganic Chemistry Lecture 12/Arpril 26 Acid-Base and Donor Acceptor Chsmitry Frontier Orbital Description of Lewis Concept Even with proper orbital symmetry, a single species can act as an oxidizing agent, an acid, a base and a reducing agent depending on the energy level the other reactant. Acid-Base Strength (1) Acid dissociation equilibrium constant (aqueous) (2) Gas phase proton affinity Inductive effect Steric effect Solvation effect Acid-Base Strength Steric effect: Acid-Base Strength Leveling Effect Acid-Base Strength Leveling Effect
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2 Theory and Hard and Soft Acid and Bases By Pearson, 1963 Hard: non-Ploarizable Soft: polarizable Hard acid prefers to bind to hard bases, and soft acid prefers to
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Unformatted text preview: bind to soft bases. Theory and Hard and Soft Acid and Bases Theory and Hard and Soft Acid and Bases I, ionization potential (energy): minimum energy required to remove an electron from a gas phase atom. Ea, electron affinity: the change of energy when a gaseous atom gain one electron. χ (chi), electron negativity (EN): The power of an atom to attract electrons to itself when it is a part of a compound Polarization of atoms Theory and Hard and Soft Acid and Bases Quantitative measures: Absolute hardness = half the difference between the ionization energy and the electron affinity. Soft ness is defined as the inverse of hardness. Theory and Hard and Soft Acid and Bases...
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This note was uploaded on 06/27/2010 for the course CHEMISTRY Chem 172 taught by Professor Duan,x. during the Spring '10 term at UCLA.

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Lecture 12 - bind to soft bases. Theory and Hard and Soft...

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