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/

Global: Zendy Plus annual

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

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The structure and dynamics of enigmatic hexa(3,5-di- tert -butylphenyl)ethane was characterized via NMR spectroscopy for the first time. Our variable temperature NMR analysis demonstrates an enthalpy-entropy compensation that results in a vanishingly low dissociation energy (Δ G 298d = -1.60(6) kcal mol -1 ). An in silico study of increasingly larger all- meta alkyl substituted hexaphenylethane derivatives (Me, i Pr,  t  Bu, Cy, 1-Ad) reveals a non-intuitive correlation between increased dimer stability with increasing steric crowding. This stabilization originates from London dispersion as expressed through the increasing polarizability of the alkyl substituents. Substitution with conformationally flexible hydrocarbon moieties, e.g. , cyclohexyl, introduces large unfavourable entropy contributions. Therefore, using rigid alkyl groups like tert -butyl or adamantyl as dispersion energy donors (DED) is essential to help stabilize extraordinary bonding situations.

Sizing the role of London dispersion in the dissociation of all-meta tert-butyl hexaphenylethane