Cargando…

Cooperative effects between π-hole triel and π-hole chalcogen bonds

MP2/aug-cc-pVTZ calculations have been performed on π-hole triel- and chalcogen-bonded complexes involving a heteroaromatic compound. These complexes are very stable with large interaction energy up to −47 kcal mol(−1). The sp(2)-hybridized nitrogen atom engages in a stronger π-hole bond than the sp...

Descripción completa

Detalles Bibliográficos
Autores principales: Zhang, Jingru, Li, Wenzuo, Cheng, Jianbo, Liu, Zhenbo, Li, Qingzhong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9083131/
https://www.ncbi.nlm.nih.gov/pubmed/35541088
http://dx.doi.org/10.1039/c8ra04106g
Descripción
Sumario:MP2/aug-cc-pVTZ calculations have been performed on π-hole triel- and chalcogen-bonded complexes involving a heteroaromatic compound. These complexes are very stable with large interaction energy up to −47 kcal mol(−1). The sp(2)-hybridized nitrogen atom engages in a stronger π-hole bond than the sp-hybridized species although the former has smaller negative electrostatic potential. The sp(2)-hybridized oxygen atom in 1,4-benzoquinone is a weaker electron donor in the π-hole bond than the sp(2)-hybridized nitrogen atom. The π-hole triel bond is stronger than the π-hole chalcogen bond. A clear structural deformation is found for the triel or chalcogen donor molecule in these π-hole-bonded complexes. The triel bond exhibits partially covalent interaction, whereas the chalcogen bond exhibits covalent interaction in the SO(3) complexes of pyrazine and pyridine derivatives with a sp(2)-hybridized nitrogen atom. Intermolecular charge transfer (>0.2e) occurs to a considerable extent in these complexes. In ternary complexes involving an aromatic compound, wherein a triel bond and a chalcogen bond coexist, both the interactions are weakened or strengthened when the central aromatic molecule acts as a double Lewis base or plays a dual role of both a base and an acid. Both electrostatic and charge transfer effects have important contributions toward changes in the strength of both interactions.