Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
A UV Study of the Magnesium Haematoporphyrin Complex
V. D. AnandW. R. Carper
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1973 Volume 46 Issue 10 Pages 3077-3078


The interaction between magnesium and haematoporphyrin has been studied spectrophotometricaly as a function of concentration, pH and temperature and the existence of a strong 1 : 1 complex has been established. The Benesi-Hildebrand equation was used to determine Kc’s at various wavelengths and temperatures, at pH’s of 7.4, 8.2, and 9.0. The enthalpy of complex formation is seen to change from +9.78 kcal/mol to −9.50 kcal/mol as the pH changes from 8.2 to 9.0. This change may be a reflection of the change in the various ligands which coordinate to the magnesium ion in addition to the porphyrin ring.

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