Solvent Effects On Triplet‐State Bacteriochlorophyll A As Detected By Transient Raman Spectroscopy And The Environment Of Bacteriochlorophyll A In The Light‐Harvesting Complex Of Rhodobacter Sphaeroides R26

Ei‐ichi, Nishizawa and Limantara, Leenawaty and Noriyuki, Nanjou and Hiroyoshi, Nagae and Tomisaburo, Kakuno and Yasushi, Koyama (1994) Solvent Effects On Triplet‐State Bacteriochlorophyll A As Detected By Transient Raman Spectroscopy And The Environment Of Bacteriochlorophyll A In The Light‐Harvesting Complex Of Rhodobacter Sphaeroides R26. Photochemistry and Photobiology. ISSN 1751-1097

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Abstract

The frequenct of the ring-breathing (Ca―Cm stretching) Raman line of bacteriochlorophyll a (BChl) in the T1 state (abbreviated as vr") was determined in 16 different solvents. The vr" frequencies were in the region of 1578-1581 cm-1 in polar solvents forming the hexa-coordinated monomers, while they were in the region of 1585-1591 cm-1 in polar solvents forming the penta-coordinated monomers. The vr" frequencies were 1597 and 1599 cm-1 in methylene chloride and carbon tetrachloride forming penta-coordinated BChl aggregates. Possible mechanisms in which the vr" frequency reflects the states of intermolecular interactions are discussed. The vr" frequency of BChl that was bound to the light-harvesting complex (LHC) of Rhodobacter sphaeroides R26 was found to be 1598 cm-1, a result which suggests that a pair of BChl molecules form a dimer in the LHC in the T1 state.

Item Type:	Artikel
Subjects:	Q Science > QD Chemistry
Divisions:	Fakultas Teknologi dan Desain > Teknik Sipil
Depositing User:	Admin Repository
Date Deposited:	15 Apr 2020 04:04
Last Modified:	02 Jun 2022 03:11
URI:	http://eprints.upj.ac.id/id/eprint/75

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