Synthesis and properties of synthetic fulvic acid derived from hematoxylin V. A. Litvin, B. F. Minaev, G. V. Baryshnikov
Material type: ArticleSubject(s): фульвокислоты | гематоксилинGenre/Form: статьи в журналах Online resources: Click here to access online In: Journal of molecular structure Vol. 1086. P. 25-33Abstract: A model fulvic acid (FA) was synthesized from a natural dye, hematoxylin, in a slow oxidative polymerization/condensation reaction catalysed by OH− at pH ca. 12. The resulting dark-brown product, acidified to pH ca. 2, did not precipitate from the reaction solution. It was isolated and purified by cation-exchange resin. Its physicochemical and spectroscopic properties, as determined by means of elemental analysis, molecular weight analyses, Fourier transform infra red (FTIR) and ultraviolet–visible (UV–VIS) spectroscopy, X-ray diffraction and electron paramagnetic resonance (EPR) spectroscopy, showed a close resemblance to natural FA. The similarity and differences between synthetic fulvic acids derived from hematoxylin and the natural fulvic acids substances are discussed. Quantum-chemical calculations of the supposed primary oxidation products of hematoxylin are performed and compared with observations.Библиогр.: 9 назв.
A model fulvic acid (FA) was synthesized from a natural dye, hematoxylin, in a slow oxidative polymerization/condensation reaction catalysed by OH− at pH ca. 12. The resulting dark-brown product, acidified to pH ca. 2, did not precipitate from the reaction solution. It was isolated and purified by cation-exchange resin. Its physicochemical and spectroscopic properties, as determined by means of elemental analysis, molecular weight analyses, Fourier transform infra red (FTIR) and ultraviolet–visible (UV–VIS) spectroscopy, X-ray diffraction and electron paramagnetic resonance (EPR) spectroscopy, showed a close resemblance to natural FA. The similarity and differences between synthetic fulvic acids derived from hematoxylin and the natural fulvic acids substances are discussed. Quantum-chemical calculations of the supposed primary oxidation products of hematoxylin are performed and compared with observations.
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