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Laser Raman scattering and preresonance in Co(III)‐ATP complexes
Author(s) -
Yu NaiTeng,
Lanir A.,
Werber M. M.
Publication year - 1981
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250110303
Subject(s) - chemistry , raman spectroscopy , raman scattering , ion , analytical chemistry (journal) , spectroscopy , phenanthroline , crystallography , stereochemistry , physics , optics , organic chemistry , chromatography , quantum mechanics
Interactions of cobalt(III) ion with adenosine‐5′‐triphosphate in the presence of 1,10‐phenanthroline and superoxide were studied by laser Raman spectroscopy. Striking intensity enhancement of two adenine ring vibrations at 734 and 1430 cm −1 was observed upon formation of the complex Co(III)‐(phen)‐ATP‐O 2 − . The effect could be abolished by addition of cyanide ion to replace the superoxide ion. The spectral features were interpreted as indicating a direct binding of Co(III) to the C 6 ‐NH 2 group of adenine. The interaction between Co(III) and 1,10‐phenanthroline was manifested in the frequency and intensity changes near 436 and 1064 cm −1 . Raman intensities at 734, 1312, 1055 and 1430 cm −1 were measured as a function of laser exciting wavelength. The gradual changes in Raman excitation profiles of ATP lines from 647.1 nm to 457.9 nm indicated the preresonance effect with a charge transfer transition between adenine and Co(III), which may lie between 300 and 400 nm as evidenced by the more dramatic enhancement of these lines with 406.7 nm excitation.