INVESTIGADORES
AUCAR Gustavo Adolfo
artículos
Título:
Microsolvation of heavy halides
Autor/es:
CHAMORRO, YULY; FLÓREZ, EDISON; MALDONADO, ALEJANDRO; AUCAR, GUSTAVO; RESTREPO, ALBEIRO
Revista:
INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
Editorial:
JOHN WILEY & SONS INC
Referencias:
Año: 2021 vol. 121
ISSN:
0020-7608
Resumen:
The fundamental question of how intermolecular interactions lead to the stabilization of heavy halides (Br−, I−, At−) microsolvated with up to six explicit water molecules is addressed here. An exhaustive exploration of the potential energy surfaces using a random search algorithm followed by optimization of molecular geometries using pseudopotentials and at the full four component relativistic levels of theory, affords a good number of structures with high probabilities of occurrence, highlighting the important role of local minima to reproduce experimentally measured properties. Sequential hydration enthalpies for astatide are reported here for the first time in the scientific literature. Closed shell (ionic, long range) as well as intermediate character interactions (contributions from closed shell and covalent) are at play stabilizing the clusters. The ability of water molecules to either donate or to accept electron density dictates the nature and strength of the corresponding hydrogen bonds in solvation shells. Binding energies and molecular geometries are shown to be more sensitive to electron correlation than to relativistic effects.