Spectroscopic properties and temperature induced electronic configuration changes of all-trans and 15-cis β-carotenes in ionic liquids

Title:

Spectroscopic properties and temperature induced electronic configuration changes of all-trans and 15-cis β-carotenes in ionic liquids

Creator:

Bialek-Bylka, G. E., Pawlak, K., Jazurek, B., Skrzypczak, A., and Koyama, Y.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:cc56dd34-cc6f-45e2-a20c-8202ec9d3539
uuid:cc56dd34-cc6f-45e2-a20c-8202ec9d3539
issn:0300-3604
doi:10.1007/s11099-007-0027-z

Subject:

1-methyl-3-octyloxymethylimidazolium tetrafluoroborate, 15-cis, all-trans β-carotene, electronic absorption, and fluorescence

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

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. and G. E. Bialek-Bylka ... [et al.].

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

161-166

Source:

Photosynthetica | 2007 Volume:45 | Number:2

Harvested from:

CDK

Metadata only:

false