The Stark effect in reaction centers from Rhodobacter sphaeroides R-26 and Rhodopseudomonas viridis.

Abstract

The effect of an electric field on the optical absorption (Stark effect) of reaction centers (RCs) from Rhodobacter sphaeroides and Rhodopseudomonas viridis embedded in films of poly(vinyl alcohol) was measured. The infrared bands were investigated at 295 K and 77 K. In RCs from R. viridis at 77 K six peaks (at 982, 849, 835, 818, 803 and 787 nm), associated with the Qy transitions of the six pigments, were resolved; in addition, a small broad band at 865 nm was resolved. In RCs from R. sphaeroides only five bands (at 877, 817, 802, 761, and 754 nm) assigned to the Qy transitions were resolved; in addition, two small bands at 697 and 683 nm were observed. The additional bands have been tentatively assigned to vibrational side bands, although the contribution from charge-transfer states cannot be excluded. The Stark spectra had line shapes similar to the second derivative of the absorption spectra and were interpreted in terms of the interaction between the applied electric field and the dipole moments of the ground and excited states. Analyses of the spectra yielded the apparent change in dipole moment .DELTA..mu.app = f.DELTA..mu. (where the factor f corrects for the difference between the local field and the applied field) and .delta., the angle between .DELTA..vector..mu. and the transition moment .vector..mu.trans. At 77 K the values of .DELTA..mu.app and .delta. for the peaks at 877, 802, and 761 nm in R. sphaeroides were 6.5 debye, 38.degree.; 2.1 debye, 23.degree.; and 3.5 debye, 8.degree.. In R. viridis the debye values for the peaks at 982, 835, 818, and 787 were 8.2, 40.degree.; 1.8, 50.degree.; 3.4, 14.degree.; and 2.7, 0.degree.. The large values of .DELTA..mu.app associated with the long-wavelength peak of the bacteriochlorophyll dimers are consistent with a significant charge-transfer contribution to the excited state of the primary donor.