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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/088/03/0155-0162

    • Keywords

       

      Electronic spectra; infrared spectra; aminoquinones; methoxy quinones

    • Abstract

       

      Electronic spectra of amino substitutedp-benzoquinones (PBQ) have been recorded and the bands assigned on the basis of PPP-CI calculations. The results show that the aminoquinones have two allowedπ -π* transitions around 3.70 eV and 5.65 eV. Then -π* transition of tetra-aminop-benzoquinone is found to be almost ten times more intense than that of diaminop-benzoquinones. A comparison of methoxy and aminop-benzoquinones gives strong evidence for the quinonoid character for the latter rather than a quadrupolar merocyanine structure. An examination of the infrared spectra suggests the existence of intra-molecular hydrogen bonding in aminoquinones.

    • Author Affiliations

       

      M S Ramachandran1 U Chandra Singh1 N R Subbaratnam1 V K Kelkar2

      1. Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai - 625 021
      2. Chemistry Division, Bhabha Atomic Research Centre, Bombay - 400 085
    • Dates

       
  • Journal of Chemical Sciences | News

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