Research output: Contribution to journal › Article › peer-review
Two series of 1:1 complexes with strong OHN hydrogen bonds formed by dimethylphosphinic and phenylphosphinic acids with 10 substituted pyridines were studied experimentally by liquid state NMR spectroscopy at 100 K in solution in a low-freezing polar aprotic solvent mixture CDF 3 /CDClF 2 . The hydrogen bond geometries were estimated using previously established correlations linking 1 H NMR chemical shifts of bridging protons with the O···H and H···N interatomic distances. A new correlation is proposed allowing one to estimate the interatomic distance within the OHN bridge from the displacement of 31 P NMR signal upon complexation. We show that the values of 31 P NMR chemical shifts are affected by an additional CH···O hydrogen bond formed between the P?O group of the acid and ortho-CH proton of the substituted pyridines. Breaking of this bond in the case of 2,6-disubstituted bases shifts the 31 P NMR signal by ca. 1.5 ppm to the high field.
Translated title of the contribution | Влияние образования водородных связей в комплексах 1:1 фосфиновых кислот с замещенными пиридинами на 1H и 31P ЯМР химические сдвиги |
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Original language | English |
Pages (from-to) | 2252-2260 |
Journal | Journal of Physical Chemistry A |
Volume | 123 |
Issue number | 11 |
Early online date | 26 Feb 2019 |
DOIs | |
State | Published - 21 Mar 2019 |
ID: 39978684