Nitrogen electron nuclear double resonance and proton triple resonance experiments on the bacteriochlorophyll cation in solution.
AUTOR(ES)
Hoff, A J
RESUMO
Electron nuclear double resonance signals of the pyrrole nitrogens of bacteriochlorophyll alpha cation in a solution of CH2Cl2/CH3OH (6:1) have been observed. The nitrogens are inequivalent: the hyperfine coupling constants were determined to be 2.36 and 3.18 MHz (0.84 and 1.14 G, respectively). Triple electron nuclear double resonance experiments have yielded the signs and values of nine proton hyperfine coupling constants. The assignment based on these data agrees well with previous work (Borg, D.C., Forman, A. & Fajer, J. (1976) J. Amer. Chem. Soc. 98, 6889-6893); in addition, two methine protons have been identified. Spin densities calculated from the hyperfine couplings are compared to reported molecular orbital calculations.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=392539Documentos Relacionados
- Structural studies of the primary donor cation radical P870+· in reaction centers of Rhodospirillum rubrum by electron-nuclear double resonance in solution
- Nuclear magnetic resonance study of d-TGGCCA in solution.
- Proton magnetic resonance studies of 2'-,3'-, and 5'-deoxyadenosine conformations in solution.
- Proton nuclear magnetic resonance study on the solution conformation of human epidermal growth factor.
- Femtosecond pump-probe spectroscopy of bacteriochlorophyll a monomers in solution.
