Spectroscopic studies of inclusion complexes of methyl-p-dimethylaminobenzoate and its ortho derivative with α- and β-cyclodextrins
| Autor: | Janina R. Heldt, Agata Lazarowska, Marek Józefowicz, Józef Heldt |
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| Rok vydání: | 2012 |
| Předmět: |
alpha-Cyclodextrins
Time Factors Electrons Photochemistry Absorption Analytical Chemistry chemistry.chemical_compound para-Aminobenzoates Aminobenzoates Instrumentation Spectroscopy Equilibrium constant Aqueous solution Chemistry Hydrogen bond beta-Cyclodextrins Fluorescence Atomic and Molecular Physics and Optics Solutions Crystallography Spectrometry Fluorescence Excited state Intramolecular force Solvents 4-Aminobenzoic Acid Derivative (chemistry) Stoichiometry |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 86:481-489 |
| ISSN: | 1386-1425 |
| DOI: | 10.1016/j.saa.2011.10.072 |
| Popis: | The effects of α- and β-cyclodextrins (CDs) on the both emission modes (LE – locally excited and TICT – twisted intramolecular charge transfer) of the fluorescence spectrum of methyl-p-dimethylaminobenzoate (I) and its o-methoxy (II) derivative in aqueous solution have been investigated using steady-state and time-resolved fluorescence techniques. It is found that the intensity of both fluorescence bands increases with increasing concentration of α- and β-CD. The stoichiometries and equilibrium constants of the fluorophore–cyclodextrin inclusion complexes have been determined by steady-state fluorescence measurements. Performed spectroscopic studies demonstrate that in the case of I in α-CD and β-CD, both 1:1 and 1:2 inclusion complexes are formed, whereas only 1:1 inclusion complex is formed between II and β-CD. |
| Databáze: | OpenAIRE |
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