Combinatorial Vibration-Mode Assignment for the FTIR Spectrum of Crystalline Melamine: A Strategic Approach toward Theoretical IR Vibrational Calculations of Triazine-Based Compounds.
Although polymeric graphitic carbon nitride (g-C3N4) has been widely studied as metal-free photocatalyst, the description of its structure still remains a great challenge. Fourier transform infrared (FTIR) spectroscopy can provide complementary structural information. In this paper, we reconsider the representative crystalline melamine and develop a strategic approach to theoretically calculate the IR vibrations of this triazine-based nitrogen-rich system. IR calculations were based on three different models: a single molecule, a 4-molecule unit cell, and a 32-molecule cluster, respectively. By this comparative study the contribution of the intermolecular weak interactions were elucidated in detail. An accurate and visualized description on the experimental FTIR spectrum has been further presented by a combinatorial vibration-mode assignment based on the calculated potential energy distribution of the 32-molecule cluster. The theoretical approach reported in this study opens the way to the facile and accurate assignment for IR vibrational modes of other complex triazine-based compounds, such as g-C3N4.
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, P.R. China.
Xiaohong
X
Yuan
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, P.R. China.
Kun
K
Luo
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, P.R. China.
Keqin
K
Zhang
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, P.R. China.
Julong
J
He
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, P.R. China.
Yuanchun
Y
Zhao
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, P.R. China.
Dongli
D
Yu