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Citation: LIANG Xiao-Jing, CUI Li, WU De-Yin, TIAN Zhong-Qun. Structures and Vibrational Spectra of Adenine and Protonated Adenine[J]. Acta Physico-Chimica Sinica, ;2009, 25(08): 1605-1610. doi: 10.3866/PKU.WHXB20090808 shu

Structures and Vibrational Spectra of Adenine and Protonated Adenine

1.
State Key Laboratory of Physical Chemistry of Solid Surfaces, Dopartment of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China

Received Date: 5 March 2009
Available Online: 11 June 2009

The structures and vibrational spectra of neutral and protonated adenine molecules were calculated at the B3LYP/aug-cc-pVTZ level. For neutral adenine, the N9H adenine configuration is more stable in energy of about 32.76 kJ·mol-1 (6.28 kJ·mol-1 by using the polarization continuous model (PCM)) than N7H adenine. Based on the potential energy distribution (PED) calculated using the scaled quantummechanical field (SQMF) procedure, we corrected the assignments of some N9H adenine fundamental vibrations. There are five stable configurations for protonated adenine and the isomer of adenine that is protonated at the N1 position is the most stable. Based on vibration analysis, we assigned the fundamental vibrations of this configuration and analyzed the Raman spectra of adenine in the HClO4 (pH=1) solution.
- Adenine,
- Density functional theory,
- Vibrational spectrum,
- Protonated adenine
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