Photosynthetica 2007, 45(2):161-166 | DOI: 10.1007/s11099-007-0027-z
Spectroscopic properties and temperature induced electronic configuration changes of all-trans and 15-cis β-carotenes in ionic liquids
- 1 Faculty of Technical Physics, University of Technology, Poznan, Poland
- 2 Faculty of Chemical Technology, University of Technology, Poznan, Poland
- 3 Faculty of Science and Technology, Kwansei Gakuin University, Sanda, Japan
The clear vibrational structure of fluorescence spectrum of β-carotene in the solvent is reported for the first time at room temperature. This finding is in good agreement with recently discovered covalent 3 1Ag- new carotenoid state. The fluorescence yield of β-carotene in ionic liquid (1-methyl-3-octyloxymethylimidazolium tetrafluoroborate) is around hundred times higher than in standard solvent n-hexane. The all-trans and 15-cis β-carotene fluorescence yields in ionic liquid are 1.96±0.03 and 2.53±0.03 %, respectively. The ionic liquid is a very useful tool for modelling photosynthetic system in situ. We present the electronic absorption data of β-carotene in ionic liquids (so called neoteric solvents) with special interest in the absorption changes as a function of temperature in the range 0-90 °C (273-363 K). Ionic liquids are also very good medium for temperature study, because they are not changing up to several hundred °C and also not evaporating during heating. The relationship between spectral characteristics of β-carotene in new generation solvents with increasing and decreasing temperature is evaluated. The energy value of the ionic state 1 1Bu+ of synthetic β-carotene in ionic liquids exhibits a linear and temperature reversible dependence on temperature up to 30 °C (303 K) and up to 40 °C (313 K) for 15-cis and all-trans β-carotenes, respectively. This is valid for both 0-0 and 0-1 transitions.
Additional key words: 1-methyl-3-octyloxymethylimidazolium tetrafluoroborate; 15-cis, all-trans β-carotene; electronic absorption; fluorescence
Received: June 30, 2006; Accepted: August 17, 2006; Published: June 1, 2007 Show citation
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