English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

The placement of a nucleophile X along the R-CH 3 axis of a methyl group can be described as either a trifurcated H bond or as a tetrel bond between C and X. Quantum calculations of the vibrational and NMR spectral features of a number of systems are used to provide a framework by which to distinguish between the presence of a tetrel or H bond. Both cationic and neutral methyl-containing Lewis acids (SMe 3  + , NMe 4  + , SMe 2 ) are paired with both neutral and anionic Lewis bases (NH 3 , OH 2 , OCHNH 2 , OCH 3  - , OH - , HCOO - ). As the base is moved away from the R-CH 3 axis of the Lewis acid (tetrel bond) toward a position along a CH axis (CH···X H bond), the methyl stretching frequencies shift to the red, and the bending modes shift to the blue. This modification in the geometry also causes the methyl C atom NMR chemical shielding to increase, while the methyl H atom is progressively deshielded. These changes are of sufficiently large magnitude that they should provide a means to distinguish these two bonding situations from one another.

Ability of IR and NMR Spectral Data to Distinguish between a Tetrel Bond and a Hydrogen Bond