STUDY OF AN AL(III) COMPLEX WITH THE PLANT DYE BRAZILEIN FROM CEASALPINIA SAPPAN LINN AL(III) COMPLEX WITH BRAZILEIN FROM CEASALPINIA SAPPAN LINN

Kamonchanok  Wongsooksin; Saowanee  Rattanaphani; Malee  Tangsathit - kulchai; Vichitr  Rattanaphani; John  Barnard Bremner

Authors

Kamonchanok Wongsooksin School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, Thailand, 30000
Saowanee Rattanaphani School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, Thailand, 30000
Malee Tangsathit - kulchai School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, Thailand, 30000
Vichitr Rattanaphani School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, Thailand, 30000
John Barnard Bremner

Keywords:

brazilein, spectrophotometry, complexation, alum

Abstract

The structure of the complex formed between Al(III) (alum) and brazilein in aqueous solution wasinvestigated using UV-visible spectroscopy. The molar ratio method and Job’s method of continuousvariation were applied to ascertain the stoichiometric composition of the complex in aqueous solution.A 1:2 complex was indicated by both methods. A structure for Al(brazilein)2 was proposed and thecalculated heat of formation of this complex, obtained by the semiempirical PM3 method, indicatedthat the proposed complex was a reasonable one energetically.

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