Abstract
“Proton sponges,” derivatives of prototypic 1,8-bis(dimethylamino)naphthalene (DMAN), exhibit remarkable basicity, which made them interesting for various experimental and theoretical studies. The details of bridged proton dynamics in protonated DMAN and its derivative denoted as TMGN (1,8-bis(tetramethylguanidino)naphthalene) were investigated on the basis of density functional theory (DFT) and Car-Parrinello molecular dynamics (CPMD) methods. Special attention was paid to the effects of symmetry of the molecular skeleton and the type of substituent on the bridged proton neighborhood statistics and dynamics. The metric parameter analyses of hydrogen bridge provided us with a conclusion that proton migration events in TMGNH+ are less numerous than in DMANH+, which can be rationalized by noticing the slower dynamics of large substituents of TMGN with respect to the smaller –N(Me)2 groups of DMAN. The atomic velocity power spectra served as computational models of the vibrational signatures associated with the presence of the intramolecular hydrogen bond. A broad feature was registered for hydrogen bonds present in both compounds. The computations were verified by experimental data available.
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Acknowledgments
Authors would like to thank the Wrocław Centre for Networking and Supercomputing (WCSS), the Academic Computer Center (TASK) in Gdańsk for generous computing time grants and the use of computational facilities.
Funding
The authors would like to thank the National Science Centre (Poland) which supported this work under the grant no. UMO-2015/17/B/ST4/03568.
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Jezierska, A., Panek, J.J. Theoretical study of intramolecular hydrogen bond in selected symmetric “proton sponges” on the basis of DFT and CPMD methods. J Mol Model 26, 37 (2020). https://doi.org/10.1007/s00894-020-4296-9
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DOI: https://doi.org/10.1007/s00894-020-4296-9