Microwave Spectroscopy of Molecular Interactions
Summary
Microwave spectroscopy exploits the interaction of molecules with electromagnetic radiation in the gigahertz frequency range to probe rotational transitions that are exquisitely sensitive to molecular geometry and intermolecular forces. By measuring the precise frequencies at which molecules absorb or emit microwaves, researchers can determine rotational constants that reflect bond lengths and angles, dipole moments and conformational landscapes. Advances in broadband techniques, such as chirped-pulse Fourier transform microwave spectroscopy, and high-resolution molecular rotational resonance methods now allow rapid collection of spectra from complex mixtures or weakly bound clusters. Coupled with quantum-chemical calculations, these experiments yield detailed insights into hydrogen bonding, dispersion interactions and cooperative effects that govern molecular recognition, solvation and self-assembly. Applications range from characterising microsolvation around functional groups to distinguishing regio- and stereoisomers in reaction monitoring, with implications for atmospheric chemistry, astrochemistry, pharmaceutical analysis and the design of functional materials. The combination of experimental precision and theoretical modelling establishes microwave spectroscopy as a vital tool for unveiling the fundamental principles of non-covalent interactions in the gas phase.
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Microwave Spectroscopy of Molecular Interactions publication trend
The graph below shows the total number of articles in microwave spectroscopy of molecular interactions across all publications each year (not limited to Nature Index journals).
Technical terms
Microwave spectroscopy: Analytical technique that measures rotational transitions of gas-phase molecules in the gigahertz range to determine molecular structure and interactions.
Rotational transition: Change in a molecule’s rotational energy level induced by absorption or emission of microwave photons, dependent on molecular moment of inertia.
Dipole moment: Vector quantity describing the separation of positive and negative charge in a molecule, essential for coupling with microwave radiation.
Hydrogen bond: Attractive interaction between a hydrogen atom bound to an electronegative atom and a lone pair on another electronegative atom, critical in molecular recognition and solvation.
Non-covalent interaction: Weak forces—including dispersion, electrostatic and hydrogen bonding—that govern molecular assembly, stability and function.
Chirped-pulse Fourier transform microwave spectroscopy (FTMW): Broadband method using frequency-swept microwave pulses and time-domain detection to record rotational spectra of multiple species simultaneously.
Molecular rotational resonance (MRR) spectroscopy: High-resolution technique for analysing rotational spectra with the sensitivity to distinguish isomers and quantify species in complex mixtures.
References
- Molecular Structure of Salicylic Acid and Its Hydrates: A Rotational Spectroscopy Study. International Journal of Molecular Sciences (2024).
- Direct regioisomer analysis of crude reaction mixtures via molecular rotational resonance (MRR) spectroscopy. Chemical Science (2020).
- The Role of Non‐Covalent Interactions on Cluster Formation: Pentamer, Hexamers and Heptamer of Difluoromethane. Angewandte Chemie International Edition (2021).
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