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• W4385650109 endingPage "136389" @default.
• W4385650109 startingPage "136389" @default.
• W4385650109 abstract "Hydrogen bonding interactions, such as the O-H…O interaction, play a crucial role in stabilizing conformations of both organic and biological molecules. In this study, we employed the infrared (IR)–vacuum-ultraviolet (VUV) non-resonant ionization detected IR spectroscopy (NRID-IR) method to investigate the molecular structure of neutral and cationic 2-methoxyethanol (CH3OCH2CH2OH, 2-ME). The stable structures and anharmonic IR spectra of neutral and cationic 2-ME were calculated using density functional theory (DFT) at the B3LYP-D3(BJ)/def2-TZVPP level. Our results revealed that the two most stable conformers of neutral 2-ME exhibit a weak O-H…O intramolecular hydrogen bond, while the cationic 2-ME lacks the O-H…O interaction but contains a C-H…O intramolecular hydrogen bond. A comparison of the experimental and theoretical IR absorption spectra reveals that the most stable conformer (gauche-(anti-gauche)-trans) is the primary contributor to the observed IR spectra of neutral 2-ME in the 2700-7250 cm−1 range. Similarly, the second stable conformer is found to be the dominant contributor to the observed IR spectra of cationic 2-ME in the range of 2700-7100 cm−1. Additionally, the C-H fundamental stretching mode of cationic 2-ME is found to be blue-shifted by approximately 100 cm−1 compared to that of neutral 2-ME. Furthermore, the natural bond orbital (NBO) analysis suggests that in neutral 2-ME, the n(O)→σ*(CαH) interactions result in significant negative hyperconjugation, leading to the weakening of CαH bonds and a subsequent reduction in vibrational energy." @default.
• W4385650109 created "2023-08-09" @default.
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• W4385650109 date "2023-12-01" @default.
• W4385650109 modified "2023-10-17" @default.
• W4385650109 title "Vibrational spectroscopy of neutral and cationic 2-Methoxyethanol" @default.
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• W4385650109 doi "https://doi.org/10.1016/j.molstruc.2023.136389" @default.
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