Abstract
5,10,15,20-Tetrakis(4-N-ethylpyridiniurmyl)porphyrin (TEPyP) formed 1:1 stoichiometry inclusion complexes with β-cyclodextrin (β-CD) and its derivatives including hydroxypropyl-β-cyclodextrin (HP-β-CD), sulfobutylether-β-cyclodextrin (SBE-β-CD) in basic aqueous solution. The supramolecular system was investigated by the methods of fluorescence, UV-vis absorption spectroscopy, nuclear magnetic resonance (NMR) technique. The inclusion ability of cyclodextrins exhibited remarkable difference for β-CD, HP-β-CD and SBE-β-CD. Association constants as high as K = 1.1 × 104M-1 in the case of HP-β-CD/TEPyP and 2.0 × 105M-1 in the case of SBE-β-CD/TEPyP complexes were determined, whereas a lower value (K = 550 M-1) was given in the case of β-CD/TEPyP. The results showed that hydrogen bonding and charge attraction play important roles in the processes of host-guest interaction. The interaction mechanism of inclusion processes could be explained by the analysis of NMR spectroscopy. The supramolecular assembly was formed. β-CD and HP-β-CD approached from the primary face of cavities of CDs.
| Original language | English |
|---|---|
| Pages (from-to) | 413-418 |
| Number of pages | 6 |
| Journal | Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy |
| Volume | 61 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 14 Jan 2005 |
User-Defined Keywords
- Absorption
- Cyclodextrin
- Fluorescence
- Meso-tetrakis (4-N-ethylpyridiniurmyl)porphyrin (TEPyP)
- Nuclear magnetic resonance (NMR)
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