Molecular spectroscopy and chirality

Chirality—the property by which a molecule and its mirror image are non-superimposable—has profound consequences in biology and medicine, since two mirror-image forms of the same compound can behave very differently in living systems. Chiroptical spectroscopy addresses this by measuring how chiral molecules interact differently with left- and right-handed polarized light, using techniques such as vibrational circular dichroism and optical rotation to determine which mirror-image form, or absolute configuration, a given compound actually has. When paired with computational methods like density functional theory and NMR-based conformational analysis, these approaches allow researchers to assign stereochemistry in complex natural products without needing a crystal suitable for X-ray diffraction. Active challenges include improving the accuracy of computational predictions for flexible molecules that adopt multiple conformations in solution, and extending reliable chiroptical analysis to larger, more structurally complex compounds where current models still struggle.

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Keywords

Chiroptical SpectroscopyAbsolute ConfigurationNMRDensity Functional TheoryVibrational Circular DichroismOptical Rotation