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Kong X, Brinkmann A, Terskikh V, Wasylishen RE, Bernard GM, Duan Z, Wu Q, Wu G. Proton Probability Distribution in the O···H···O Low-Barrier Hydrogen Bond: A Combined Solid-State NMR and Quantum Chemical Computational Study of Dibenzoylmethane and Curcumin. J Phys Chem B 2016; 120:11692-11704. [PMID: 27782387 DOI: 10.1021/acs.jpcb.6b08091] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report a combined solid-state (1H, 2H, 13C, 17O) NMR and plane-wave density functional theory (DFT) computational study of the O···H···O low-barrier hydrogen bonds (LBHBs) in two 1,3-diketone compounds: dibenzoylmethane (1) and curcumin (2). In the solid state, both 1 and 2 exist in the cis-keto-enol tautomeric form, each exhibiting an intramolecular LBHB with a short O···O distance (2.435 Å in 1 and 2.455 Å in 2). Whereas numerous experimental (structural and spectroscopic) and computational studies have been reported for the enol isomers of 1,3-diketones, a unified picture about the proton location within an LBHB is still lacking. This work reports for the first time the solid-state 17O NMR data for the O···H···O LBHBs in 1,3-diketones. The central conclusion of this work is that detailed information about the probability density distribution of the proton (nuclear zero-point motion) across an LBHB can be obtained from a combination of solid-state NMR and plane-wave DFT computations (both NMR parameter calculations and ab initio molecular dynamics simulations). We propose that the precise proton probability distribution across an LBHB should provide a common basis on which different and sometimes seemingly contradicting experimental results obtained from complementary techniques, such as X-ray diffraction, neutron diffraction, and solid-state NMR, can be reconciled.
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Affiliation(s)
- Xianqi Kong
- Department of Chemistry, Queen's University , 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6
| | - Andreas Brinkmann
- Measurement Science and Standards, National Research Council Canada , 1200 Montreal Road, M-40, Ottawa, Ontario, Canada K1A 0R6
| | - Victor Terskikh
- Department of Chemistry, Queen's University , 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6.,Department of Chemistry, University of Ottawa , 10 Marie Curie Private, Ottawa, Ontario, Canada K1N 6N5
| | | | - Guy M Bernard
- Department of Chemistry, University of Alberta , Edmonton, Alberta, Canada T6G 2G2
| | - Zhuang Duan
- Department of Chemistry, University of Alberta , Edmonton, Alberta, Canada T6G 2G2
| | - Qichao Wu
- Department of Chemistry, University of Alberta , Edmonton, Alberta, Canada T6G 2G2
| | - Gang Wu
- Department of Chemistry, Queen's University , 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6
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