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Pietruś W, Kurczab R, Kalinowska-Tłuścik J, Machalska E, Golonka D, Barańska M, Bojarski AJ. Influence of Fluorine Substitution on Nonbonding Interactions in Selected Para-Halogeno Anilines. Chemphyschem 2021; 22:2115-2127. [PMID: 34310822 DOI: 10.1002/cphc.202100383] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 07/22/2021] [Indexed: 01/03/2023]
Abstract
A series of 4-halogeno aniline derivatives was studied employing combined theoretical and experimental methods (i. e. crystal structure analysis and vibrational spectroscopies). This simplified model system was selected to shed light on the impact of fluorine substitution on the formation of noncovalent interactions such as halogen bonds (XBs) and hydrogen bonds (HBs), which are key interactions in fluorinated/halogenated drug-protein complex formation. Comparative analysis of three previously reported and five newly determined crystal structures indicated that, in most cases, 2-fluoro and 2,6-difluoro substitution of 4-X anilines increases the ability of adjacent amine to form strong N-H⋅⋅⋅N HBs. Additionally, fluorine substituents in the difluorinated derivatives are competitive and attractive HB and XB acceptors and increase the probability of halogen-halogen contacts. A peculiar observation was made for 4-iodoaniline and 2,6-difluoro-4-iodoaniline, which form distinct interaction patterns compared to the corresponding 4-Cl and 4-Br analogs. The observed intramolecular N-H⋅⋅⋅F interactions lead to additional NH bands in the FT-IR spectra.
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Affiliation(s)
- Wojciech Pietruś
- Department of Medicinal Chemistry, Maj Institute of Pharmacology, Polish Academy of Sciences, Smetna 12, 31-343, Kraków, Poland.,Faculty of Chemistry Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
| | - Rafał Kurczab
- Department of Medicinal Chemistry, Maj Institute of Pharmacology, Polish Academy of Sciences, Smetna 12, 31-343, Kraków, Poland.,Faculty of Mathematical and Natural Sciences, University of Applied Sciences in Tarnów, Mickiewicza 8, 33-100, Tarnów, Poland
| | | | - Ewa Machalska
- Faculty of Chemistry Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland.,Jagiellonian Centre for Experimental Therapeutic (JCET), Jagiellonian University, Bobrzynskiego 14, 30-348, Kraków, Poland
| | - Dominika Golonka
- Faculty of Mathematical and Natural Sciences, University of Applied Sciences in Tarnów, Mickiewicza 8, 33-100, Tarnów, Poland
| | - Małgorzata Barańska
- Faculty of Chemistry Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland.,Jagiellonian Centre for Experimental Therapeutic (JCET), Jagiellonian University, Bobrzynskiego 14, 30-348, Kraków, Poland
| | - Andrzej J Bojarski
- Department of Medicinal Chemistry, Maj Institute of Pharmacology, Polish Academy of Sciences, Smetna 12, 31-343, Kraków, Poland
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Saunders LK, Nowell H, Hatcher LE, Shepherd HJ, Teat SJ, Allan DR, Raithby PR, Wilson CC. Exploring short strong hydrogen bonds engineered in organic acid molecular crystals for temperature dependent proton migration behaviour using single crystal synchrotron X-ray diffraction (SCSXRD). CrystEngComm 2019. [DOI: 10.1039/c9ce00925f] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Short strong hydrogen bonds in multi-component organic acid molecular crystals exhibit temperature dependent proton migration for certain HB donor–acceptor distances.
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Affiliation(s)
- Lucy K. Saunders
- Diamond Light Source
- Harwell Science and Innovation Campus
- Didcot OX11 0DE
- UK
| | - Harriott Nowell
- Diamond Light Source
- Harwell Science and Innovation Campus
- Didcot OX11 0DE
- UK
| | | | - Helena J. Shepherd
- School of Physical Sciences
- Ingram Building
- University of Kent
- Canterbury
- UK
| | - Simon J. Teat
- Advanced Light Source
- Lawrence Berkeley National Laboratory
- Berkeley
- USA
| | - David R. Allan
- Diamond Light Source
- Harwell Science and Innovation Campus
- Didcot OX11 0DE
- UK
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