Wydział Chemii

Aneta Jezierska

Jarosław J. Panek

2020

Journal of Molecular Modeling

26

37/1-37/10

10.1007/s00894-020-4296-9

Naukowa

Angielski

Artykuł

“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.

“Proton sponge”, Intramolecular hydrogen bond, DFT, CPMD, 2Dpmf

http://dx.doi.org/10.1007/s00894-020-4296-9

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