1. Pyridine reacts with alkaline haematin to form a dipyridine dihydroxy dimeric haematin in which there is no competition between pyridine and OH− for coordination positions on the iron of haematin. 2. Imidazole competes directly with OH− to form the monomeric imidazole parahaematin in alkaline media. 3. The monomeric imidazole parahaematin aggregates readily to form a species that is precipitated on standing. 4. A structure is proposed for the haematin–pyridine compound in alkaline media.
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Research Article| June 01 1968
Alkaline haematin and nitrogenous ligands
W. A. Gallagher;
Biochem J (1968) 108 (1): 131–136.
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W. A. Gallagher, W. B. Elliott; Alkaline haematin and nitrogenous ligands. Biochem J 1 June 1968; 108 (1): 131–136. doi: https://doi.org/10.1042/bj1080131
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