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Conformer Pair Contributions to Optical Rotations in a Series of Chiral Linear Aliphatic Alcohols

DOI:10.1007/s40242-018-8182-2 期刊:Chemical Research in Chinese Universities 出版年份:2018 更新时间:2025-09-09 09:28:46
摘要: The chain length effect of four chiral aliphatic alcohols, (S)-2-butanol, (S)-2-pentanol, (S)-2-hexanol and (S)-2-heptanol, on their specific optical rotations(OR) was studied experimentally and theoretically via quantum theory. Many conformations of each chiral alcohol exist as conformer pairs in solution. The OR sum from these pairs of conformers has much smaller contributions to OR values than that contributed by the most stable conformation. These four alcohols’ OR values were also investigated using the matrix model, which employs each substituent’s comprehensive mass, radii, electronegativity and symmetry number as the elements in the matrix. These are all particle properties. This matrix determinant is proportional to its OR values within a closely related structural series of chiral compounds. The experimental OR values and the matrix determinants of these four alcohols were compared with the predicted OR values obtained from quantum theory wave functions. The ORs predicted by the matrix method, which is based on particle function statistics, agreed with the results from quantum theory. The agreement between OR predictions by the matrix method and DFT calculations illustrates the wave-particle duality of polarized light that is operating in these predictions.
作者: ZHAO Dan,REN Jie,XIONG Yongfei,DONG Mengxiang,ZHU Huajie,Charles U. PITTMAN, Jr.
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It is clear that the OR values calculated from wave functions(DFT) match the experimental values well. Pairs of conformers exist for a chiral compound with a long chain connected to stereogenic center. The contributions of these conformer pairs to OR is small since they tend to cancel each other. The major contribution to the molecule’s OR is from the most stable conformer’s OR. The most stable conformation has the smallest radii in solution. At the same time, we have confirmed that the OR values could be obtained using the matrix method that is constructed from particle functions. Each substituent attached to the chiral center is represented by elements that are particle properties of that substituent. Only the van der Vaals radius for simple substituents or the smallest radii for other substituents were used in the determinant for the matrix model computations, where that determinant is proportional to its OR value. Both wave and particle characteristics of light and electrons are manifest in these optical rotation determinations. The ability to use either quantum theory wave mechanics methods(based on electron characteristics) or the particle-based matrix method(based on the entire molecule particle characteristics) to calculate OR using the four chiral linear alcohols (S)-1 through (S)-4 demonstrates wave particle unity in OR.

The technical and application constraints of the experiments, as well as potential areas for optimization.

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