TY - JOUR
T1 - Encapsulation of charged halogens by the 512 water cage
AU - Gómez, Sara
AU - Flórez, Elizabeth
AU - Acelas, Nancy
AU - Cappelli, Chiara
AU - Hadad, Cacier
AU - Restrepo, Albeiro
N1 - Publisher Copyright:
© 2024 The Royal Society of Chemistry
PY - 2024/5/6
Y1 - 2024/5/6
N2 - This study focuses on the encapsulation of the entire series of halides by the 512 cage of twenty water molecules and on the characterization of water to water and water to anion interactions. State-of-the-art computations are used to determine equilibrium geometries, energy related quantities, and thermal stability towards dissociation and to dissect the nature and strength of intermolecular interactions holding the clusters as stable units. Two types of structures are revealed: heavily deformed cages for F− indicating a preference for microsolvation, and slightly deformed cages for the remaining anions indicating a preference for encapsulation. The primary variable dictating the properties of the clusters is the charge density of the central halide, with the most severe effects observed for the F− case. For the remaining halides, the anion may be safely viewed as a sort of “big electron” with little local disruptive power, enough to affect the network of non-covalent hydrogen bonds in the cage, but not enough to break it. Gibbs energies for dissociation either into cavity and halide or into water molecules and halide suggest that, in a similar way as to methane clathrate, a more weakly bonded complex that has been detected in the gas phase, all halide containing clathrate-like structures should be amenable to experimental detection in the gas phase at moderate temperature and pressure conditions.
AB - This study focuses on the encapsulation of the entire series of halides by the 512 cage of twenty water molecules and on the characterization of water to water and water to anion interactions. State-of-the-art computations are used to determine equilibrium geometries, energy related quantities, and thermal stability towards dissociation and to dissect the nature and strength of intermolecular interactions holding the clusters as stable units. Two types of structures are revealed: heavily deformed cages for F− indicating a preference for microsolvation, and slightly deformed cages for the remaining anions indicating a preference for encapsulation. The primary variable dictating the properties of the clusters is the charge density of the central halide, with the most severe effects observed for the F− case. For the remaining halides, the anion may be safely viewed as a sort of “big electron” with little local disruptive power, enough to affect the network of non-covalent hydrogen bonds in the cage, but not enough to break it. Gibbs energies for dissociation either into cavity and halide or into water molecules and halide suggest that, in a similar way as to methane clathrate, a more weakly bonded complex that has been detected in the gas phase, all halide containing clathrate-like structures should be amenable to experimental detection in the gas phase at moderate temperature and pressure conditions.
UR - http://www.scopus.com/inward/record.url?scp=85193601733&partnerID=8YFLogxK
U2 - 10.1039/d4cp01340a
DO - 10.1039/d4cp01340a
M3 - Artículo
C2 - 38747303
AN - SCOPUS:85193601733
SN - 1463-9076
VL - 26
SP - 15426
EP - 15436
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
IS - 21
ER -