Tetrahydrofuran

Article Abstract:

Research was conducted to examine the structure and dynamics of tetrahydrofuran (THF) which represents the simplest model system for the vibrations of the furanose ring of ribose and deoxyribose embedded in the nucleic acid backbones. In addition to the calibration step performed in aqueous solution, infrared and Raman spectra of 1 M aqueous solution of THF are presented. The agreement between the experimental and calculated infrared intensities, nonresonant Raman intensities and depolarization ratios supports the proposed spectral assignment.

Spectra, Nucleic acids, Tetrahydrofuran

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Comparison of the structures and vibrational modes of carboxybiotin and N-carboxy-2-imidazolidone

Article Abstract:

Raman and FTIR spectroscopies were used in the study of the spontaneous decarboxylation of N-carboxy-2-imidazolidone (a model for carboxybiotin) and N(1')-carboxybiotin. The HF/6-31G* optimized structure of 2-methylbiotin revealed that the ureido ring portion was essentially planar, in accord with a number of X-ray crystallographic structures of biotin compounds. Comparison of the structures of the carboxybiotin and carboxyimidazolidone, derived at the HF/6-31G* level, indicated that lengths of the ring-nitrogen-to-carboxylate bonds are equal.

Biotin

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Vibrational relaxation and redistribution in the 2Ag(super -) state of all-trans-lycopene as revealed by picosecond time-resolved absorption spectroscopy

Article Abstract:

Vibrational relaxation and redistribution in the 2Ag(super -) state of all-trans-lycopene were investigated using picosecond time-resolved absorption spectroscopy. The time-resolved S(sub n)(2B(sub u)(super +)) <- S(sub 1)(2Ag(super -)) absorption spectra of the all-trans-lycopene in quinoline and CS2 solutions can be characterized in terms of vibrational structures originating from the C=C and C-C stretching modes. The time scales of vibrational relaxation were also measured by spectral simulation.

Analysis, Carotenoids, Photosynthesis research, Relaxation phenomena, Relaxation (Physics), Molecular spectra

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