Association Constants of the Complexes between 8-Hydroxyquinolines with Ammonia and Methylamine in 90% Methanol + Water Mixtures release_se4b7dqxvneapdoydeb56jeeoq

Abstract

Department of Chemistry, TDB Collage, Asansol Department of Chemistry, Kalyani University, Kalyani-741 235 <em>Manuscript received 28 March 1995, revised 29 September 1995, accepted 15 November 1995</em> 8-Hydroxyquinoline (<strong>HQ</strong>), 5-chloro-7-iodlo-8-hydroxyquinollne (<strong>ICHQ)</strong> and 5,7-dilodo-8-hydroxyquinoline (<strong>I₂HQ</strong>) form stable yellow complexes with<strong> NH₃</strong> and <strong>CH₃H₂</strong> at room temperature but decompose above 323 K. The association constants of the complexes at 298 K calculated spectrophotometrically in 90% methanol solution have been found to be fairly high. The stability of the complexes with <strong>NH₃</strong> or <strong>CH₃NH₂</strong> are usually In the order, <strong>ICHQ &gt; I₂HQ &gt; HQ</strong>.
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