Resolving the halogen vs. hydrogen bonding dichotomy in solutions: intermolecular complexes of trihalomethanes with halide and pseudohalide anions
| Autor: | Sergiy V. Rosokha, Olivia Grounds, William Borley, Brandon Watson |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010405 organic chemistry
Hydrogen bond Intermolecular force General Physics and Astronomy Halide 010402 general chemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Stability constants of complexes Halogen Physical chemistry Molecule Physical and Theoretical Chemistry Absorption (chemistry) Acetonitrile |
| Zdroj: | Physical Chemistry Chemical Physics. 20:21999-22007 |
| ISSN: | 1463-9084 1463-9076 |
| DOI: | 10.1039/c8cp03505a |
| Popis: | Halogen- and hydrogen-bonded complexes between trihalomethanes, CHX3, and (pseudo-)halide anions, A-, co-existing in acetonitrile solutions were identified and characterized via a combination of UV-vis and NMR spectral measurements with the results of X-ray structural and computational analyses. Halogen-bonded [CHX3, A-] complexes displayed strong absorption bands in the UV range (showing Mulliken correlations with the frontier orbital energies of the interacting species) and a decreased shift of the NMR signal of trihalomethanes' protons. Hydrogen bonding led to the opposite (increased) NMR signal shift and the UV-vis absorption bands of the hydrogen-bonded [CHX3, A-] complexes were similar in intensity to those of the separate CHX3 molecules. The simultaneous multivariable treatment of the results of UV-vis and NMR titrations of CHX3 with A- anions afforded formation constants of both halogen- and hydrogen-bonded complexes between these species, which existed side-by-side in the acetonitrile solutions. The relative values of the formation constants were consistent with the magnitudes of the positive potentials on the surfaces of the halogen or hydrogen atoms if the effects of the polarization of the trihalomethanes due to the presence of the anions were taken into account. |
| Databáze: | OpenAIRE |
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