Final published version
Licence: CC BY: Creative Commons Attribution 4.0 International License
Research output: Contribution to Journal/Magazine › Journal article › peer-review
<mark>Journal publication date</mark> | 25/10/2021 |
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<mark>Journal</mark> | Angewandte Chemie International Edition |
Issue number | 44 |
Volume | 60 |
Number of pages | 7 |
Pages (from-to) | 23878-23884 |
Publication Status | Published |
Early online date | 1/10/21 |
<mark>Original language</mark> | English |
A combination of charge density studies and solid state nuclear magnetic resonance (NMR) 1 J NC coupling measurements supported by periodic density functional theory (DFT) calculations is used to characterise the transition from an n-π* interaction to bond formation between a nucleophilic nitrogen atom and an electrophilic sp 2 carbon atom in a series of crystalline peri-substituted naphthalenes. As the N⋅⋅⋅C distance reduces there is a sharp decrease in the Laplacian derived from increasing charge density between the two groups at ca. N⋅⋅⋅C = 1.8 Å, with the periodic DFT calculations predicting, and heteronuclear spin-echo NMR measurements confirming, the 1 J NC couplings of ≈3-6 Hz for long C-N bonds (1.60-1.65 Å), and 1 J NC couplings of <1 Hz for N⋅⋅⋅C >2.1 Å.