• Anion-𝜋 interactions in layered structures of salts of 5-(hydroxyimino) quinolin-8-one and related salts

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      https://www.ias.ac.in/article/fulltext/jcsc/127/01/0095-0102

    • Keywords

       

      Layered structures; anion-𝜋 interactions; quinoline salts; crystal structures; optical properties

    • Abstract

       

      Relevance of anion-𝜋 interactions in chloride, bromide, nitrate and perchlorate salts of 5-(hydroxyimino)quinolin-8-one are discussed. Structures of nitrate salt of 5-aminoquinoline as well as nitrate salt of 4-hydroxyquinazoline are compared with the structure of nitrate salt of 5-(hydroxyimino)quinolin-8-one. From such a comparison, two different arrangements of nitrate ions with respect to the respective cations are discerned. Nitrate ions are sandwiched between aromatic planes of cations in nitrate salts of 5-(hydroxyimino)quinolin-8-one or 4-hydroxyquinazoline; whereas, nitrate ions are in oblique positions with respect to aromatic planes of counter cations in nitrate salt of 5-aminoquinoline. Binding constants of different nitrate salts in solution are determined by UV-visible spectroscopic titrations. Solution study shows formation of ion-pairs of these salts in solution.

    • Author Affiliations

       

      Prithiviraj Khakhlary1 Jubaraj B Baruah1

      1. Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati 781 039, Assam, India
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