Lecture 8 - 2 Frontier Orbital Description of Lewis Concept...

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1 Chem 172 Advanced Inorganic Chemistry Lecture 8 Acid-Base and Donor Acceptor Chsmitry Arrhenius Concept (1890s) Arrhenius acids form hydrogen ions in aqueous solution; Arrhenius bases form hydroxide ions in aqueous solution. Bronsted-Lowry Concept (1923) Acids: species with a tendency to lose a hydrogen ions; Bases: species with a tendency to gain a hydrogen ions. Solvent-System Concept The solvent system concept appies to any solvent that can dissocaite into a action (acid) and a an anion (base). Acid: Solute that can increase the concentration of cation; Base: Solute that can increase the conctration of anion. Lewis Concept Acid: electron pair acceptor; Base: electron pair donor. Frontier Orbital Description of Lewis Concept
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Unformatted text preview: 2 Frontier Orbital Description of Lewis Concept 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. Frontier Orbital Description of Lewis Concept A base has an electron pair in a HOMO of suitable symmetry to interact with the LUMO of an acid . The better the energy match between base HOMO and acid LUMO, the stronger the interaction. Frontier Orbital Approach to Acid-Base Reaction Hydrogen Bond Frontier Orbital Approach to Acid-Base Reaction Hydrogen Bond...
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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 8 - 2 Frontier Orbital Description of Lewis Concept...

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