Thermal stability of amino acid-(tyrosine and tryptophan) coated magnetites View Full Text


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Article Info

DATE

2008-02-08

AUTHORS

L. Patron, G. Marinescu, D. Culita, L. Diamandescu, O. Carp

ABSTRACT

The thermal stability of two amino acid-(tyrosine and tryptophan) coated magnetite and their corresponding precursors, [Fe2IIIFeII(Tyr)8]·9H2O and [Fe2IIIFeII(Trp)2(OH)4](NO3)2·8H2O (where tyrosine=Tyr and tryptophan=Trp), was analyzed in comparison with free amino acids. The complexes present a lower thermal stability relative to the free ligand, due to the catalytic effect introduced by the iron cation and the presence of NO3− groups. The presence of NO3− group determines also a different degradation’s stoichiometry of the amino acid anion comparative with the one expressed by the free ligand molecule. The amino acid bonded to magnetite decomposes in two steps, its presence inducing an increasing of γ-Fe2O3→Fe2O3 conversion temperature. More... »

PAGES

627-632

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10973-006-8082-4

DOI

http://dx.doi.org/10.1007/s10973-006-8082-4

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1051218720


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