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Resonance Raman spectroscopy of metal‐substituted bacteriochlorophylls: characterization of Raman bands sensitive to bacteriochlorin conformation
Author(s) -
Näveke Arne,
Lapouge Karine,
Sturgis James N.,
Hartwich Gerhard,
Simonin Ingrid,
Scheer Hugo,
Robert Bruno
Publication year - 1997
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/(sici)1097-4555(199708)28:8<599::aid-jrs136>3.0.co;2-c
Subject(s) - raman spectroscopy , chemistry , resonance raman spectroscopy , molecule , bacteriochlorophyll , metal , analytical chemistry (journal) , characterization (materials science) , resonance (particle physics) , crystallography , organic chemistry , nanotechnology , materials science , pigment , physics , particle physics , optics
Fourier transform (FT) preresonance Raman spectra of Mg‐containing bacteriochlorophyll a (BChla) and the metal‐substituted Zn‐, Ni‐, Cu‐ and Co‐bacteriopheophytins a (BPhea) allowed the characterization of those vibrational modes sensitive to the nature of the central metal, through its effect on the core size of these molecules. Six of the Raman modes active in the excitation conditions used (1064 nm, in preresonance with the Q y transition of the metal–bacteriopheophytin molecules) are shown to be sensitive to the conformation of the dihydrophorbin ring. Comparison of the FT‐Raman spectra of BChla under conditions where the central Mg ion is either five‐ or six‐coordinate show that these modes may be used to distinguish modifications of the dihydrophorbin core size as small as 1 pm, and thus that they may be used for characterizing conformational strains on BChla molecules both in vitro and in vivo . © 1997 John Wiley & Sons, Ltd.