Understanding the influence of alkali cations and halogen anions on the cooperativity of cyclic hydrogen-bonded rosettes in supramolecular stacks

• Autores: Petelski, Andre Nicolai; Fonseca Guerra, Célia
• Año de publicación: 2022
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: CHARGE TRANSFER; COOPERATIVE EFFECTS; HYDROGEN BONDS; SELF-ASSEMBLY; STACKING INTERACTIONS
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Hydrogen-bonded supramolecular systems are known to obtain extra stabilization from the complexation with ions, like guanine quadruplex (GQ). They experience strong hydrogen bonds due to cooperative effects. To gain deeper understanding of the interplay between ions and hydrogen-bonding cooperativity, relativistic dispersion-corrected density functional theory (DFT-D) computations were performed on triple-layer hydrogen-bonded rosettes of ammeline interacting with alkali metal cations and halides. Our results show that when ions are placed between the stacks, the hydrogen bonds are weakened but, at the same time, the cooperativity is strengthened. This phenomenon can be traced back to the shrinkage of the cavity as the ions pull the monomers closer together and therefore the distance between the monomers becomes smaller. On one hand this results in a larger steric repulsion, but on the other hand, the donor-acceptor interactions are enhanced due to the larger overlap between the donating and accepting orbitals leading to more charge donation and therefore an enhanced electrostatic attraction.
Fil: Petelski, Andre Nicolai. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Tecnológica Nacional. Facultad Regional Resistencia. Departamento de Ingeniería Química. Laboratorio de Química Teórica y Experimental; Argentina. Vrije Universiteit Amsterdam; Países Bajos
Fil: Fonseca Guerra, Célia. Vrije Universiteit Amsterdam; Países Bajos