α-氨基丁酸对映异构体在DMF+水混合溶剂中的焓对作用

doi:10.3866/PKU.WHXB201206261

Abstract

Abstract:

Dilution enthalpies of two α-aminobutyric acid enantiomers, L-α-aminobutyric acid and D-α-aminobutyric acid, in dimethylformide (DMF)+water mixtures of various compositions are determined by isothermal titration microcalorimetry (ITC) at 298.15 K. Homotactic enthalpic pairwise interaction coefficients for each solvent composition are calculated according to the McMillan-Mayer theory of statistical thermodynamics. From the point of view of solute-solute and solute-solvent interactions, competition equilibria among hydrophobic-hydrophobic, hydrophobic-hydrophilic, and hydrophilichydrophilic interactions in ternary solutions are explored. It is found that all values of h_xx are positive across the entire studied composition range of mixed solvents (mass fraction of DMF, w_DMF=0-0.3), gradually reducing with the increasing w_DMF. It is of interest that the h_xx values for the L-enantiomer are universally larger than those of the D-enantiomer (h_LL>h_DD), which indicates that ITC is useful to discriminate homochiral enthalpic pairwise interaction of enantiomers. Our results show that hydrophobic-hydrophobic and hydrophobic-hydrophilic interactions are predominant in pairwise molecular interaction processes in ternary solutions containing α-aminobutyric acid, water, and DMF, and that the configuration of L-L molecular pair is more advantageous for the approach of hydrophobic side-chains (CH₃CH₂－) on α-carbon than a D-D pair, where part of the structured water molecules relax to less structured bulky water due to the overlap and partial breaking of hydrophobic hydration cospheres around nonpolar groups. This confirms that the process is spontaneous and is accompanied with positive enthalpy change and obvious increase in entropy (ΔG<0, ΔH>0, and ΔS=(ΔH-ΔG)/T>0), consequently releasing more heat upon dilution of the solutions and leading to larger values of h_xx.

Key words: α-Aminobutyric acid, Enantiomer, DMF+water mixture, Isothermal ditration microcalorimetry, Dilution enthalpy, Enthalpic pairwise interaction, Chirality discrimination effect

GUO Zheng, HU Xin-Gen, LIANG Hong-Yu, JIA Zhao-Peng, CHENG Wei-Na, LIU Jia-Min. Enthalpic Pairwise Interactions of α-Aminobutyric Acid Enantiomers in DMF+Water Mixtures[J]. Acta Phys. -Chim. Sin. 2012, 28(09), 2015-2022. doi: 10.3866/PKU.WHXB201206261

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Enthalpic Pairwise Interactions of α-Aminobutyric Acid Enantiomers in DMF+Water Mixtures

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