Home

Citation: Li Bao-Zong. Density Functional Theory Calculations on 2-thioxanthine Tautomers[J]. Acta Physico-Chimica Sinica, ;2004, 20(12): 1455-1458. doi: 10.3866/PKU.WHXB20041211 shu

Density Functional Theory Calculations on 2-thioxanthine Tautomers

Li Bao-Zong

1.
School of Chemistry and Chemical Engineering,Suzhou University,Suzhou　215006

Received Date: 15 April 2004
Available Online: 15 December 2004

Molecular structures of fourteen 2-thioxanthine tautomers were calculated by the B3LYP /6-311G** method, both in the gas and aqueous phases, with full geometry optimization. The Onsager solvate theory model was employed for aqueous solution calculations. The structures, total energy, standard enthalpy, standard entropy and standard Gibbs free energy were obtained. The calculations show that 2-thioxanthine existing as the thione(keto) forms is the predominant tautomer in the gas and aqueous phases. The thione(keto)-N(7)(H) tautomer is more stable than the thione(keto)-N(9)(H) tautomer in the gas and aqueous phases. The results are in od agreement with available experimental results. The entropy effect on the Gibbs free energy of 2-thioxanthine base is very small and there is little significance for the tautomeric equilibria of the base.The enthalpic term is dominant in the determination of tautomeric equilibria. The free energy of solvation is well correlated with the dipole moments of 2-thioxanthine tautomer. Additionally, the relative stabilities of 2-thioxanthine tautomers and 6-thioxan thine ones were examined.
- 2-thioxanthine;　Tautomer;　Density functional theory;　Self-consistent reaction field method;　Dipole moment
1. [1]
  Meifeng Zhu , Jin Cheng , Kai Huang , Cheng Lian , Shouhong Xu , Honglai Liu . Classical Density Functional Theory for Understanding Electrochemical Interface. University Chemistry, 2025, 40(3): 148-152. doi: 10.12461/PKU.DXHX202405166
2. [2]
  Hao XU , Ruopeng LI , Peixia YANG , Anmin LIU , Jie BAI . Regulation mechanism of halogen axial coordination atoms on the oxygen reduction activity of Fe-N₄ site: A density functional theory study. Chinese Journal of Inorganic Chemistry, 2025, 41(4): 695-701. doi: 10.11862/CJIC.20240302
3. [3]
  Jianquan Liu , Xiangshan Wang . Teaching Design and Practice of Naming Rules for Circular Isomer Configuration under the Guidance of Information Literacy. University Chemistry, 2025, 40(7): 352-358. doi: 10.12461/PKU.DXHX202409082
4. [4]
  Conghao Shi , Ranran Wang , Juli Jiang , Leyong Wang . The Illustration on Stereoisomers of Macrocycles Containing Multiple Chiral Centers via Tröger Base-based Macrocycles. University Chemistry, 2024, 39(7): 394-397. doi: 10.3866/PKU.DXHX202311034
5. [5]
  Xiaolei Jiang , Fangdong Hu . Exploring the Mirror World in Organic Chemistry: the Teaching Design of “Enantiomers” from the Perspective of Curriculum and Ideological Education. University Chemistry, 2024, 39(10): 174-181. doi: 10.3866/PKU.DXHX202402052
6. [6]
  Renqing Lü , Shutao Wang , Fang Wang , Guoping Shen . Computational Chemistry Aided Organic Chemistry Teaching: A Case of Comparison of Basicity and Stability of Diazine Isomers. University Chemistry, 2025, 40(3): 76-82. doi: 10.12461/PKU.DXHX202404119
7. [7]
  Liuxie Liu , Jing He , Jiali Du , Shuang Mao , Qianggen Li . Extension of Computational Chemical-Assisted Dipole Moment Measurement Experiment. University Chemistry, 2025, 40(3): 363-370. doi: 10.12461/PKU.DXHX202407108
8. [8]
  Hongting Yan , Aili Feng , Rongxiu Zhu , Lei Liu , Dongju Zhang . Reexamination of the Iodine-Catalyzed Chlorination Reaction of Chlorobenzene Using Computational Chemistry Methods. University Chemistry, 2025, 40(3): 16-22. doi: 10.12461/PKU.DXHX202403010
9. [9]
  Baitong Wei , Jinxin Guo , Xigong Liu , Rongxiu Zhu , Lei Liu . Theoretical Study on the Structure, Stability of Hydrocarbon Free Radicals and Selectivity of Alkane Chlorination Reaction. University Chemistry, 2025, 40(3): 402-407. doi: 10.12461/PKU.DXHX202406003
10. [10]
  Yiying Yang , Dongju Zhang . Elucidating the Concepts of Thermodynamic Control and Kinetic Control in Chemical Reactions through Theoretical Chemistry Calculations: A Computational Chemistry Experiment on the Diels-Alder Reaction. University Chemistry, 2024, 39(3): 327-335. doi: 10.3866/PKU.DXHX202309074
11. [11]
  Qiqi Li , Su Zhang , Yuting Jiang , Linna Zhu , Nannan Guo , Jing Zhang , Yutong Li , Tong Wei , Zhuangjun Fan . Preparation of High Density Activated Carbon by Mechanical Compression of Precursors for Compact Capacitive Energy Storage. Acta Physico-Chimica Sinica, 2025, 41(3): 2406009-0. doi: 10.3866/PKU.WHXB202406009
12. [12]
  Xueli Mu , Lingli Han , Tao Liu . Quantum Chemical Calculation Study on the E2 Elimination Reaction of Halohydrocarbon: Designing a Computational Chemistry Experiment. University Chemistry, 2025, 40(3): 68-75. doi: 10.12461/PKU.DXHX202404057
13. [13]
  Xingyuan Lu , Yutao Yao , Junjing Gu , Peifeng Su . Energy Decomposition Analysis and Its Application in the Many-Body Effect of Water Clusters. University Chemistry, 2025, 40(3): 100-107. doi: 10.12461/PKU.DXHX202405074
14. [14]
  Keweiyang Zhang , Zihan Fan , Liyuan Xiao , Haitao Long , Jing Jing . Unveiling Crystal Field Theory: Preparation, Characterization, and Performance Assessment of Nickel Macrocyclic Complexes. University Chemistry, 2024, 39(5): 163-171. doi: 10.3866/PKU.DXHX202310084
15. [15]
  Bolin Sun , Jie Chen , Ling Zhou . 乙烯型卤代烃的亲核取代反应. University Chemistry, 2025, 40(8): 152-157. doi: 10.12461/PKU.DXHX202410032
16. [16]
  Aiyi Xin , Jiawei Li , Xinyang Ran , Chuanjiang Fu , Zhiguo Wang . Collaborative Science and Education Based Experimental Design in Organic Chemistry: A Case Study of the Nucleophilic Substitution Reaction of 2-Hydroxymethyl-4,6-Di-Tert-Butylphenol. University Chemistry, 2025, 40(5): 366-375. doi: 10.12461/PKU.DXHX202407031
17. [17]
  Yuting Zhang , Zhiqian Wang . Methods and Case Studies for In-Depth Learning of the Aldol Reaction Based on Its Reversible Nature. University Chemistry, 2024, 39(7): 377-380. doi: 10.3866/PKU.DXHX202311037
18. [18]
  Hong CAI , Jiewen WU , Jingyun LI , Lixian CHEN , Siqi XIAO , Dan LI . Synthesis of a zinc-cobalt bimetallic adenine metal-organic framework for the recognition of sulfur-containing amino acids. Chinese Journal of Inorganic Chemistry, 2025, 41(1): 114-122. doi: 10.11862/CJIC.20240382
19. [19]
  Xueting Cao , Shuangshuang Cha , Ming Gong . Interfacial Electrical Double Layer in Electrocatalytic Reactions: Fundamentals, Characterizations and Applications. Acta Physico-Chimica Sinica, 2025, 41(5): 100041-0. doi: 10.1016/j.actphy.2024.100041
20. [20]
  Xuefei Zhao , Xuhong Hu , Zhenhua Jia . 理论与计算化学在傅-克烷基化反应教学中的应用. University Chemistry, 2025, 40(8): 360-367. doi: 10.12461/PKU.DXHX202410008

Get Citation

PDF

XML

Metrics

PDF Downloads(2707)
Abstract views(3969)
HTML views(33)

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Address：Zhongguancun North First Street 2,100190 Beijing, PR China Tel: +86-010-82449177-888

DownLoad: Full-Size Img PowerPoint

Return