Aspects of the Linear and Magnetic Circular Dichroism of Planar Organic Molecules

Inhaltsverzeichnis

• I Introduction: Assignment Criteria.
• 1. Transition energy.
• 2. Oscillator strength.
• 3. Transition moment direction.
• 4. Magnetic circular dichroism.
• 5. Substituent effects.
• 6. Less general criteria.
• II Experimental Techniques.
• 1. The stretched sheet method.
• 2. Electric fields.
• 3. Magnetic fields.
• 4. Hydrodynamic shear.
• 5. Crystal methods.
• 6. Liquid crystal methods.
• 7. Photoselection.
• III Interpretation of the Observed Spectra.
• 1. Vibronic interactions.
• 2. Interpretation of LD-spectra. Absolute moment directions.
• 3. The description of a partially oriented uniaxial sample.
• 4. Determination of reduced spectra for symmetrical molecules.
• 5. The orientation triangle.
• 6. Orientation models.
• 7. Interpretation of LD-data for low symmetry molecules.
• 8. Identical chromophores in different molecules.
• 9. Non-uniaxial samples.
• 10. Interpretation of MCD-spectra.
• IV Theoretical Models.
• 1. The ?-electron approximation.
• 2. Semiempirical calculations.
• 3. Calculation of MCD B-terms. Alternant hydrocarbons.
• 4. MCD of derivatives of alternant hydrocarbons.
• 5. Summary.
• V Examples of LD and MCD Spectra and Spectral Assignments.
• 1. Fluoranthene.
• 2. Thiophene.
• 3. Acenaphthylene.
• 4. p-Terphenyl.
• VI Conclusions.
• 1. The assignment process.
• 2. Interpretation of LD spectra.
• 3. Theoretical descriptions of electronic transitions.
• 4. New applications of MCD spectroscopy.
• Acknowledgment.
• References.