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Mössbauer Spectroscopic Characterization of Iron(III)-Polysaccharide Coordination Complexes: Photochemistry, Biological, and Photoresponsive Materials Implications.
Auerbach, Hendrik; Giammanco, Giuseppe E; Schünemann, Volker; Ostrowski, Alexis D; Carrano, Carl J.
Afiliación
  • Auerbach H; Department of Physics, University of Kaiserslautern , 67663 Kaiserslautern, Germany.
  • Giammanco GE; Department of Chemistry, Bowling Green State University , Bowling Green, Ohio 43403 United States.
  • Schünemann V; Department of Physics, University of Kaiserslautern , 67663 Kaiserslautern, Germany.
  • Ostrowski AD; Department of Chemistry, Bowling Green State University , Bowling Green, Ohio 43403 United States.
  • Carrano CJ; Department of Chemistry and Biochemistry, San Diego State University , San Diego, California 92182-1030, United States.
Inorg Chem ; 56(19): 11524-11531, 2017 Oct 02.
Article en En | MEDLINE | ID: mdl-28914533
While polycarboxylates and hydroxyl-acid complexes have long been known to be photoactive, simple carboxylate complexes which lack a significant LMCT band are not typically strongly photoactive. Hence, it was somewhat surprising that a series of reports demonstrated that materials synthesized from iron(III) and polysaccharides such as alginate (poly[guluronan-co-mannuronan]) or pectate (poly[galacturonan]) formed photoresponsive materials that convert from hydrogels to sols under the influence of visible light. These materials have numerous potential applications in areas such as photopatternable materials, materials for controlled drug delivery, and tissue engineering. Despite the near-identity of the functional units in the polysaccharide ligands, the reactivity of iron(III) hydrogels can depend on the configuration of some chiral centers in the sugar units and in the case of alginate the guluronate to mannuronate block composition, as well as pH. Here, using temperature- and field-dependent transmission Mössbauer spectroscopy, we show that the dominant iron compound detected for both the alginate and pectate gels displays features typical of a polymeric (Fe3+O6) system. The Mössbauer spectra of such systems are strongly dependent on temperature, field, size, and crystallinity, indicative of superparamagnetic relaxation of magnetically ordered nanoparticles. Pectate and alginate hydrogels differ in the size distribution of the iron oxyhydroxy nanoparticles, suggesting that in general smaller nanoparticles are more reactive. Potential biological implications of these results are also discussed.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Pectinas / Compuestos de Hierro / Alginatos / Nanopartículas / Complejos de Coordinación Idioma: En Revista: Inorg Chem Año: 2017 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Pectinas / Compuestos de Hierro / Alginatos / Nanopartículas / Complejos de Coordinación Idioma: En Revista: Inorg Chem Año: 2017 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos