C–H⋯S interaction exhibits all the characteristics of conventional hydrogen bonds
| Autor: | Sanjay Wategaonkar, Sanat Ghosh, Pragya Chopra |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Quantum chemical
Chemistry Hydrogen bond Ab initio General Physics and Astronomy Infrared spectroscopy chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Acceptor Oxygen Sulfur 0104 chemical sciences Crystallography Physical and Theoretical Chemistry 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Physical Chemistry Chemical Physics. 22:17482-17493 |
| ISSN: | 1463-9084 1463-9076 |
| DOI: | 10.1039/d0cp01508c |
| Popis: | This is a tale of a pair of a hydrogen bond donor and acceptor, namely the CH donor and sulphur acceptor, neither of which is a conventional hydrogen bond participant. Sulfur (S), being less electronegative (2.58) compared to its first row analogue oxygen (3.44), has not been considered as a potential HB acceptor for a long time. The C-HY (Y = HB acceptor) interaction has its own history of exhibiting omnidirectional shifts in the CH stretching frequency upon complex formation. Therefore, a systematic investigation of the C-HS interaction was the primary goal of the work presented here. Together with gas-phase vibrational spectroscopy and ab initio quantum chemical calculations, the nature and strength of the C-HS hydrogen bond (HB) have been investigated in the complexes of 1,2,4,5-tetracyanobenzene (TCNB) with various sulfur containing solvents. Despite the unconventional nature of both HB donor and HB acceptor (C-H and S, respectively), it was found that the C-HS hydrogen bond exhibits all the characteristics of the conventional hydrogen bond. The binding strength of the C-HS H-bond in these complexes was found to be comparable to that of the conventional hydrogen bonds. The unusual stabilities of these HBs have been mainly attributed to the attractive dispersion interaction. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|