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Intramolecular charge transfer effects on 4-hydroxy-3-methoxybenzaldehyde

Authors
Journal
Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
1386-1425
Publisher
Elsevier
Publication Date
Volume
69
Issue
3
Identifiers
DOI: 10.1016/j.saa.2007.04.035
Keywords
  • 4-Hydroxy-3-Methoxybenzaldehyde
  • β-Cyclodextrin
  • Solvent And Ph Effects
  • Inclusion Complex
  • Ict

Abstract

Abstract The absorption and fluorescence spectral characteristics of 4-hydroxy-3-methoxybenzaldehyde (HMB) have been studied in different solvents, pH and β-cyclodextrin (β-CD) and compared with 4-hydroxy-3,5-dimethoxybenzaldehyde (HDMB). The inclusion complex of HMB with β-CD is analysed by UV–vis, fluorimetry, FT-IR, 1H NMR, SEM and AM1 methods. In HMB, the normal emission (B band) is originates from a locally excited state and the longer emission (A band) is due to intramolecular charge transfer state (ICT). The OH group of HMB is present in the interior part of the β-CD cavity and aldehyde group present in the upper part of the β-CD cavity.

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