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The 2 1Ag− state of a carotenoid bound to the chromatophore membrane or Rhodobacter sphaeroides 2.4.1 as revealed by transient resonance raman spectroscopy

✍ Scribed by Michitaka Kuki; Hideki Hashimoto; Yasushi Koyama

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 543 KB
Volume: 165
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(90)85452-i

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✦ Synopsis

The transient Raman spectrum of the S, and T, states of carotenoids bound to the chromatophore membranes of Rhodobacter sphaeruides 2.4.1 (recorded by using 532 nm, GZ 100 ps, MLQS pulse trains as a difference spectrum of high power minus low power) has been compared with the S1 and T, Raman spectra of sphaeroidene and the T, Raman spectrum of sphaeroidenone. The vibronically coupled C-C stretching Raman line of bound sphaeroidene at 1766 cm-' identities the 2 '4 state as the S, state, and its frequency, which is lowered by 5 1 cm-' from that of free sphaeroidene, indicates weakened vibronic coupling for the bound carotenoid.

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✍ Yasushi Koyama; Yousuke Miki; Tadayuki Kameyama; Richard J. Cogdell; Yasutaka Wa 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 634 KB

Fluorescence and fluorescence%xcitation spectroscopy at 170 K of the light-harvesting (LH2) complex ofRhodobacter sphaeroides 2.4.1 has determined the energies of level I (2 '4 ), level II, level III ( 'B: ) and level IV of the bound spheroidene, as the absorptive O-0 transitions, to be 14500, 18300