Chirality-dependent sublimation of α

Add time:08/12/2019    Source:sciencedirect.com

A mass-spectrometric determination of the sublimation pressure diagram of α-(trifluoromethyl)-lactic acid as a function of its enantiomeric composition at 293 K shows that the racemic crystals have a 38±15% higher volatility than the enantiomerically pure crystals and the sublimation eutectic has a 55±10% higher vapor pressure. These data indicate a possibility for thermodynamically controlled enantiomeric enrichment of the residual material via sublimation of samples of higher than 35±10% ee. The vibrational spectroscopy of isolated (S,S) and (S,R) dimers in supersonic jets shows that chirality recognition effects are restricted to larger clusters. This is a consequence of the rigid planar carboxylic acid binding motif.

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