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Spectral characteristics of ortho, meta and para dihydroxy benzenes in different solvents, pH and β-cyclodextrin

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Title: Spectral characteristics of ortho, meta and para dihydroxy benzenes in different solvents, pH and β-cyclodextrin
Authors: Stalin, T.1, Devi, R. Anitha1, Rajendiran, N. drrajendiran@rediffmail.com
Source: Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy. Sep2005, Vol. 61 Issue 11/12, p2495-2504. 10p.
Subjects: Spectrum analysis, Benzene, Aromatic compounds, Solvents, Cyclodextrins
Abstract: Abstract: Spectral characteristics of ortho, meta and para dihydroxy benzenes (DHB''s) have been studied in different solvents, pH and β-cyclodextrin. Solvent study shows that: (i) the interaction of OH group with the aromatic ring is less than that of amino group both in the ground and excited states, (ii) in absorption, the charge transfer interaction of OH group in para position is larger than ortho and meta positions. pH studies reveals that DHB''s are more acidic than phenol. The higher pK a value of oDHB (monoanion–dianion) indicates that the formed monoanion is more stabilized by intramolecular hydrogen bonding. DHB''s forms a 1:1 inclusion complex with β-CD. In β-CD medium, absorption spectra of DHB''s mono and dianions shows unusual blue shifts, whereas in the excited state, the spectral characteristics of DHB''s follow the same trend in both aqueous and β-CD medium. [Copyright &y& Elsevier]
Copyright of Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 18164135
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PubTypeId: academicJournal
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  Data: Spectral characteristics of ortho, meta and para dihydroxy benzenes in different solvents, pH and β-cyclodextrin
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  Data: <searchLink fieldCode="AR" term="%22Stalin%2C+T%2E%22">Stalin, T.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Devi%2C+R%2E+Anitha%22">Devi, R. Anitha</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rajendiran%2C+N%2E%22">Rajendiran, N.</searchLink><i> drrajendiran@rediffmail.com</i>
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  Data: <searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Benzene%22">Benzene</searchLink><br /><searchLink fieldCode="DE" term="%22Aromatic+compounds%22">Aromatic compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Solvents%22">Solvents</searchLink><br /><searchLink fieldCode="DE" term="%22Cyclodextrins%22">Cyclodextrins</searchLink>
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  Label: Abstract
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  Data: Abstract: Spectral characteristics of ortho, meta and para dihydroxy benzenes (DHB''s) have been studied in different solvents, pH and β-cyclodextrin. Solvent study shows that: (i) the interaction of OH group with the aromatic ring is less than that of amino group both in the ground and excited states, (ii) in absorption, the charge transfer interaction of OH group in para position is larger than ortho and meta positions. pH studies reveals that DHB''s are more acidic than phenol. The higher pK a value of oDHB (monoanion–dianion) indicates that the formed monoanion is more stabilized by intramolecular hydrogen bonding. DHB''s forms a 1:1 inclusion complex with β-CD. In β-CD medium, absorption spectra of DHB''s mono and dianions shows unusual blue shifts, whereas in the excited state, the spectral characteristics of DHB''s follow the same trend in both aqueous and β-CD medium. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.saa.2004.08.024
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 10
        StartPage: 2495
    Subjects:
      – SubjectFull: Spectrum analysis
        Type: general
      – SubjectFull: Benzene
        Type: general
      – SubjectFull: Aromatic compounds
        Type: general
      – SubjectFull: Solvents
        Type: general
      – SubjectFull: Cyclodextrins
        Type: general
    Titles:
      – TitleFull: Spectral characteristics of ortho, meta and para dihydroxy benzenes in different solvents, pH and β-cyclodextrin
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            NameFull: Stalin, T.
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            NameFull: Devi, R. Anitha
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            NameFull: Rajendiran, N.
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            – D: 01
              M: 09
              Text: Sep2005
              Type: published
              Y: 2005
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              Value: 61
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              Value: 11/12
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            – TitleFull: Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy
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