Simulation of hydrogen bonds in low-rank coals with lignite-related complexes using dispersion corrected density functional theory

LI Zhan-ku; WANG Hai-tao; YAN Hong-lei; YAN Jing-chong; LEI Zhi-ping; REN Shi-biao; WANG Zhi-cai; KANG Shi-gang; SHUI Heng-fu

Volume 48 Issue 10

Oct. 2020

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Article Navigation > Journal of Fuel Chemistry and Technology > 2020 > 48(10): 1153-1159

LI Zhan-ku, WANG Hai-tao, YAN Hong-lei, YAN Jing-chong, LEI Zhi-ping, REN Shi-biao, WANG Zhi-cai, KANG Shi-gang, SHUI Heng-fu. Simulation of hydrogen bonds in low-rank coals with lignite-related complexes using dispersion corrected density functional theory[J]. Journal of Fuel Chemistry and Technology, 2020, 48(10): 1153-1159.

Citation:

LI Zhan-ku, WANG Hai-tao, YAN Hong-lei, YAN Jing-chong, LEI Zhi-ping, REN Shi-biao, WANG Zhi-cai, KANG Shi-gang, SHUI Heng-fu. Simulation of hydrogen bonds in low-rank coals with lignite-related complexes using dispersion corrected density functional theory[J]. Journal of Fuel Chemistry and Technology, 2020, 48(10): 1153-1159.

Citation:

LI Zhan-ku, WANG Hai-tao, YAN Hong-lei, YAN Jing-chong, LEI Zhi-ping, REN Shi-biao, WANG Zhi-cai, KANG Shi-gang, SHUI Heng-fu. Simulation of hydrogen bonds in low-rank coals with lignite-related complexes using dispersion corrected density functional theory[J]. Journal of Fuel Chemistry and Technology, 2020, 48(10): 1153-1159.

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Simulation of hydrogen bonds in low-rank coals with lignite-related complexes using dispersion corrected density functional theory

School of Chemistry & Chemical Engineering, Anhui Province Key Laboratory of Coal Clean Conversion and High Valued Utilization, Anhui University of Technology, Ma'anshan 243002, China

Funds:

the National Key Research and Development Program of China 2018YFB0604600

the Natural Science Foundation of China 21776001

the Natural Science Foundation of China 21878001

the Natural Science Foundation of China U1710114

the Natural Science Foundation of China 21875001

the Natural Science Foundation of China 21808002

Anhui Province Key Laboratory of Coal Clean Conversion and High Valued Utilization, Anhui University of Technology CHV19-01

More Information

Corresponding author: LI Zhan-ku,E-mail:li_zhanku@163.com; SHUI Heng-fu,E-mail:shhf@ahut.edu.cn
Received Date: 2020-07-01
Rev Recd Date: 2020-09-06

Available Online: 2021-01-23

Publish Date: 2020-10-10

Abstract

Abstract

Phenol…phenol, phenol…benzene, phenol…oxydibenzene, phenol…quinoline, and benzoic acid…benzoic acid were selected as lignite-related complexes to investigate different hydrogen bonds formed by self-associated OH, OH-π, OH-ether O, OH-N, and COOH-COOH using density functional theory with dispersion correction, respectively. Moreover, the effects of substituents (CH₃-, CH₃O-, OH-, NH₂-, COOH-, and NO₂-) in donors on the hydrogen bonds were investigated. Geometry optimization, energy, Mulliken population, and frequency of all the complexes were calculated. It can be seen from optimized structures that there indeed are hydrogen bonds in the different complexes. Bond lengths of all O-H bonds in the different complexes become longer than that of free OH in phenol, which implies that intermolecular interactions exist in all the complexes. Among of them, bond lengths of O-H bonds in benzoic acid…benzoic acid are the longest. In addition, charge transfer can be observed via Mulliken population. Based on frequency analysis, all O-H stretching vibrations have obvious red shift, especially O-H bonds in benzoic acid…benzoic acid and phenol…quinoline, which gives evidence of using the infrared spectroscopy to analyze hydroxyl groups of coals. According to bond energies, the strength of the different hydrogen bonds decreases in the order: COOH-COOH > OH-N > self-associated OH ≈ OH-ether O > OH-π, which is consistent with the reported experimental results. Different substituents have distinct effects on the hydrogen bonds.
- hydrogen bonds,
- lignite-related complexes,
- substituents,
- density functional theory

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References(30)

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