Open AccessTransition Energy, Spectral Fine Structure, and Absorption Coefficient of Norbixin (9’-cis-6,6’-diapocarotene-6,6’dioic acid) in Different Polar Solvents
Author(s) -
Winda Rahmalia,
Uray Amira Naselia
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1751/1/012085
Subject(s) - chemistry , propylene carbonate , solvent , chloroform , acetone , absorption (acoustics) , absorbance , solvatochromism , absorption spectroscopy , analytical chemistry (journal) , photochemistry , organic chemistry , electrolyte , chromatography , materials science , physics , electrode , quantum mechanics , composite material
Transition energy, spectral fine structure, and absorption coefficient of norbixin in different polar solvents has been investigated. Eight polar solvents were used for dissolving norbixin separately, including methanol, ethanol, propylene carbonate, acetone, dichloromethane, ethyl acetate, chloroform, and dimethyl carbonate. Spectra of norbixin in the resulting solutions were determined by UV-visible spectrophotometry at atmosphere condition. The effect of solvents on transition energy was analyzed according to Onsager cavity model and Hansen theory. The approximate absorption coefficient was determined with the Beer-Lambert law. The result show that the UV-visible absorption spectra of norbixin depend on z the solvent. The greater the refraction index of the solvent and the norbixin-solvent dispersion interaction cause the transition energy of norbixin was smaller. The change in spectral fine structure has some relevance or correlation with the solvatochromic effect on π → π* transitions, the intermolecular interactions, and the S 2 state of norbixin. The absorbance of norbixin in various solvents, increased linearly with concentration.