Photooxidation of P-960 and photoreduction of P-800 (bacteriopheophytin b-800) in reaction centers from Rehodopseudomonas viridis. Exciton interaction between the pigment molecules

Primary photochemistry of reaction centers from the photosynthetic purple bacteria

“…Further clarification of the chemical nature of the species I-was sought by trapping reaction centers in the state I-[32, 45,60,98,105,120,121,133,134,147,149]. Several different bacterial species were used.…”

Picosecond detection of BChl‐800 as an intermediate electron carrier between selectively‐excited P870 and bacteriopheophytin in Rhodospirillum rubrum relaction centers

“…Each step of the electron transfer is accompanied by the loss of the excitation energy [2,3,8,20] and by the steric separation of charges. This results in the stabilization of photoseparated charges in the bacterial reaction center.…”

“…viridis reaction centers in various states have shown that the direct interaction between P and Bph transitions is not observed [3,10,11]. However P and Bph interact with 2 BChl b molecules absorbing in the region of 830-850 nm [3,10,1 l] which corresponds to the 800-810 nm region of absorbance of BChl a-containing reaction centers [9] .…”

Picosecond dynamics of primary electron-transfer processes in bacterial photosynthesis

“…By means of difference spectra obtained by chemical and photochemical trapping techniques, evidence was presented for the formation of the same radical anion identified as BPh-in systems other than the bacterium R. sphaeroides R-26. For example, Shuvalov and Klimov (7) provided such evidence in the case of Chromatium minutissimum, Tiede et al (8) and van Grondelle et al (9) in the case of Chromatium vinosum and Shuvalov et al (10) on Rhodopseudomonas viridis. The above studies support the generality of the proposed primary step in the R. sphaeroides photosynthesis.…”