Studies of Fe(II) and Fe(III)-DNA complexes by XANES spectroscopy

Studies of Fe(II) and Fe(III)-DNA complexes by XANES spectroscopy

Autor Bertoncini, C. Google Scholar
Meneghini, R. Google Scholar
Cruz, D. Z. Google Scholar
Alves, MCM Google Scholar
Tolentino, H. Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Universidade de São Paulo (USP)
Lab Nacl Luz Sincrotron
Resumo The composition of the ligands around the iron centers in Fe(II) and Fe(III)-DNA complexes has been investigated by X-ray Absorption Near Edge Structure (XANES) spectroscopy at the Fe-K-edge. the spectra are compared to the models FePO4 and Fe(dadipy)(2), each one bearing only one of the ligands expected in the Fe-DNA interaction, namely oxygen (from phosphate groups, H2O or bases) and nitrogen (from bases), respectively. the spectrum of Fe(II)-DNA exhibits a higher pre-edge peak and a more prominent shoulder at 7145 eV than Fe(III)-DNA. These spectral features indicate a distortion associated with the the presence of nitrogen in the first coordination sphere Fe(II)-DNA. These spectral features indicate a distortion associated with the presence of nitrogen in the first coordenation sphere of Fe(II)DNA. Similarities between Fe(III)-DNA and FePO4 are consistent with the possibility that only oxygen atoms are coordinated to the Fe(III) center.
Palavra-chave iron-DNA complexes
FePO4
Fe(dadipy)(2)
X-ray absorption
Idioma Inglês
Data de publicação 1999-05-01
Publicado em Journal of Synchrotron Radiation. Copenhagen: Munksgaard Int Publ Ltd, v. 6, p. 417-418, 1999.
ISSN 0909-0495 (Sherpa/Romeo, fator de impacto)
Publicador Munksgaard Int Publ Ltd
Extensão 417-418
Fonte http://dx.doi.org/10.1107/S0909049598016859
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000081221700106
Endereço permanente http://repositorio.unifesp.br/handle/11600/26077

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