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Photosynthetic energy transduction: spectral and redox characteristics of chlorophyll radicals in vitro and in vivo

Journal Article · · Adv. Chem. Ser.; (United States)
 [1]; ; ; ; ;
  1. Brookhaven National Lab., Upton, NY
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Optical, redox, and paramagnetic resonance results, as well as theoretical calculations, are presented for cation and anion radicals of magnesium tetraphenylchlorin, and serve as guides to the properties of chlorophyll ions. Electrochemical cells designed to generate the radicals are described. The spectral signatures of chlorophyll (and pheophytin) radicals in vitro are compared with those of the primary donors and acceptors of plant photosynthesis to identify the transients observed in vivo. The model studies and the theoretical calculations suggest that the protein environment of the chlorophylls in the reaction center can modulate their properties significantly, and may impose specific orientations as well as hydrogen bonding on the substituent groups of the chromophores.

DOE Contract Number:
AC02-76CH00016
OSTI ID:
6329124
Journal Information:
Adv. Chem. Ser.; (United States), Journal Name: Adv. Chem. Ser.; (United States) Vol. 201; ISSN ADCSA
Country of Publication:
United States
Language:
English

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Related Subjects

550200* -- Biochemistry
59 BASIC BIOLOGICAL SCIENCES
ALKALINE EARTH METAL COMPOUNDS
AROMATICS
CARBOXYLIC ACIDS
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
CHLORINS
CHLOROPHYLL
ELECTROLYSIS
ELECTRON SPIN RESONANCE
ENDOR
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
IN VITRO
IN VIVO
IONS
LYSIS
MAGNESIUM COMPOUNDS
MAGNETIC RESONANCE
NITROSO COMPOUNDS
NMR SPECTRA
OPTICAL PROPERTIES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHENOLS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHOTOSYNTHETIC REACTION CENTERS
PHYSICAL PROPERTIES
PHYTOCHROMES
PIGMENTS
POLYPHENOLS
PORPHYRINS
RADICALS
RESONANCE
SPECTRA
SYNTHESIS