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Spectrophotometric studies on purpurin and quinalizarin in aqueous solutions

Issa, R. M. and Zewail, A. H. (1971) Spectrophotometric studies on purpurin and quinalizarin in aqueous solutions. United Arab Republic Journal of Chemistry, 14 (5). pp. 461-472. ISSN 0372-3704.

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The absorption spectra of purpurine and quinalizarin is studied in solutions of varying PH's. The change of spectra with pH indicates the existence of two equilibria between noncharged molecules, singly ionized and doubly ionized species. The pK values of the two equilibria are determined using three methods and are discussed in relation to molecular structure. The effect of pH on the electronic transition reveals that all transitions are influenced by intramolecular charge transfer.

Item Type:Article
Additional Information:Received 27/5/1970
Issue or Number:5
Record Number:CaltechAUTHORS:20170706-125723645
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78811
Deposited By: Donna Wrublewski
Deposited On:06 Jul 2017 20:38
Last Modified:03 Oct 2019 18:12

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