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

Nenhuma Miniatura disponível
Data
1999-05-01
Autores
Bertoncini, C.
Meneghini, R.
Cruz, D. Z.
Alves, MCM
Tolentino, H.
Orientadores
Tipo
Artigo
Título da Revista
ISSN da Revista
Título de Volume
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.
Descrição
Citação
Journal of Synchrotron Radiation. Copenhagen: Munksgaard Int Publ Ltd, v. 6, p. 417-418, 1999.