| Autor: |
Maria Vikmon, Lojos Szente, Éva Fenyvesi, Jozsef Szejtli, Miyoko Suzuki, Márton Kajtár |
| Rok vydání: |
1991 |
| Předmět: |
|
| Zdroj: |
Carbohydrate Research. 214:25-33 |
| ISSN: |
0008-6215 |
| Popis: |
The circular-dichroism spectra of the inclusion complexes of 9 types of cyclodextrin (CDs) with 6 kinds of azobenzene derivatives generally show a single peak, but sometimes form a splitting pattern in the first π → π* region. All single patterns show a positive sign; indicating that the long and slim azobenzene derivatives are incorporated into the cavity from the long-axis side. The splitting patterns change in sign and magnitude according to the substitution on the component molecules and establish the formation of various stacking modes. Plots of the lengths of the azo dyes vs. the molar circular-dichroism coefficients suggest that the substituent on the CD torus is an important factor in causing splitting and deciding the sign of the split-type Cotton effects. The foregoing splitting may arise from exciton interaction of two molecules of the chromophoric dye each in the form of a 1:1 complex and in the cyclomaltooctaose (γCD) complex. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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