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15–19 Sept 2025
DESY
Europe/Berlin timezone

Bridging Non-Covalent Interactions in Diverse Cyclic Systems: Insights from Rotational Spectroscopy and Quantum Chemistry Calculations

18 Sept 2025, 12:10
20m
DESY

DESY

Contributed talk

Speaker

MAIDER PARRA SANTAMARIA (Group of Spectroscopy, Spectrometry, and Materials; University of the Basque Country (UPV/EHU))

Description

The conformational behaviour of biologically relevant cyclic molecules raises fundamental questions from a physicochemical perspective, as their structural and energetic features are closely linked to physicochemical properties and biological function. These systems are often classified by ring size into small (3–7 members), medium (8–11), and large (>12). However, as molecular flexibility increases, identifying energetic minima becomes challenging due to the interplay of weak and competing intramolecular interactions.[1]

Despite their relevance, conformational studies—particularly on larger rings and their hydrated complexes[2]—remain scarce. This work summarises key findings from recent years on non-covalent interactions that govern structural preferences, the role of functional group modifications, and the effects of microsolvation on a series of cyclic systems of increasing size, including their water complexes. These studies employ high-resolution rotational spectroscopy combined with quantum chemical calculations, showing this approach is a powerful tool for elucidating the subtle but crucial structural and interaction features that define the behaviour of these systems.

[1] V. W. Tsoi, E. Burevschi, S. Saxena and M. E. Sanz, J. Phys. Chem. A, 2022, 126, 6185–6193.
[2] C. Pérez, J. C. Lopez, S. Blanco and M. Schnell, J. Phys. Chem. Lett., 2016, 7, 4053–4058

Keywords Non-covalent interactions, rotational spectroscopy, microsolvation
This abstract is submitted for.... HBond 2025 conference

Primary author

MAIDER PARRA SANTAMARIA (Group of Spectroscopy, Spectrometry, and Materials; University of the Basque Country (UPV/EHU))

Co-authors

Camilla Calabrese (Grupo de Espectroscopía de Plasmas y Chorros Supersónicos, Departamento de Química Física y Química Inorgánica, Facultad de Ciencias — I.U. CINQUIMA) PABLO PINACHO MORANTE (Grupo de Investigación en Espectroscopía de Rotación (GIER), Departamento de Química Física y Química Inorgánica, Facultad de Ciencias — I.U. CINQUIMA) Himanshi Singh (Deutsches Elektronen-Synchrotron (DESY)) Imanol Usabiaga (Group of Spectroscopy, Spectrometry, and Materials; University of the Basque Country (UPV/EHU)) ANDER CAMIRUAGA LEZA (Group of Spectroscopy, Spectrometry, and Materials; University of the Basque Country (UPV/EHU)) Paul Pinillos (University of Bologna, Free Jet Microwave Spectroscopy Group) Emilio J. Cocinero (Group of Spectroscopy, Spectrometry, and Materials; University of the Basque Country (UPV/EHU)) Melanie Schnell (Deutsches Elektronen-Synchrotron (DESY); Institut für Physikalische Chemie, Christian-Albrechts-Universität zu Kiel)

Presentation materials