高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (7): 1492.doi: 10.7503/cjcu20140137

• 物理化学 • 上一篇    下一篇

DNA碱基(对)及其Zn2+复合物对CO2,N2,H2小分子的吸附

师帅, 黄曦明, 艾洪奇()   

  1. 济南大学化学化工学院, 济南 250022
  • 收稿日期:2014-02-24 出版日期:2014-07-10 发布日期:2014-05-26
  • 作者简介:联系人简介: 艾洪奇, 男, 博士, 教授, 主要从事生物大分子的模拟研究. E-mail: chm_aihq@ujn.edu.cn
  • 基金资助:
    国家自然科学基金委中韩合作交流及面上项目(批准号: 21211140340, 20973084)资助

Mechanism Studies on Adsorption of DNA Bases and Base Pair-Zn2+ mplexes for CO2, N2 and H2

SHI Shuai, HUANG Ximing, AI Hongqi*()   

  1. School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
  • Received:2014-02-24 Online:2014-07-10 Published:2014-05-26
  • Contact: AI Hongqi E-mail:chm_aihq@ujn.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(Nos.21211140340, 20973084)

摘要:

用M062X/6-31+G*方法探讨了腺嘌呤(A)、 胸腺嘧啶(T)、 鸟嘌呤(G)、 胞嘧啶(C)及其碱基对(AT, GC)以及Zn2+复合物(AAA-Zn2+, AAT-Zn2+和GGC-Zn2+)对混合小分子H2, N2, CO2的吸附情况, 系统研究了其相互作用模式及吸附强度, 预测了常见混合气体分子与碱基(对)及复合物的吸附位置. 研究表明, CO2倾向于以氢键的形式结合到碱基(对)的氨基氢或亚氨基氢上, 而N2和H2分子则倾向于结合到这些碱基(对)的平面π电子上, 以堆垛的形式存在. 根据吸附强度大小, 预测了由这些碱基为骨架合成的金属有机骨架(MOF)吸附材料对小分子的选择性吸附顺序为H2<N2<CO2. 研究表明, 以AT对结合金属Zn2+为节点的纯天然碱基对构成的MOF要比实验合成的AA碱基对与Zn2+结合的MOF具备更好的吸附和分离性能.

关键词: 碱基对-Zn2+复合物, M062X方法, 吸附, 氢键, 小分子, 金属有机骨架材料

Abstract:

As an intriguing material building block for microporous metal-organic framework(MOF) materials, DNA base(pair) holds usually rigid-ring structures, multiple metal coordination sites, biological compatibility, and molecular recognition as well as self-assembling characteristics that could ultimately translate into interesting material properties. In the present paper, guanine G, cytosine C, adenine A, thymine T, and their pairs GC/AT as well as their Zn2+ complexes were selected as models to study their potential behavior of building block to adsorb mixed small molecules H2, N2, CO2 by employing M062X/6-31+G* method. The interaction modes and strengths as well as potential binding sites were predicted. These results reveal that CO2 prefers H-bonding to the amino hydrogen(s) or/and imino hydrogen(s) of these bases(pairs), whereas both H2 and N2 prefer being adsorbed over the base ring with a π-stacking interaction mode. A comparison for the binding energies of these different small molecules shows that AT is the more potential building block of MOF material than GC and AA, and will adsorb these small molecules hierarchically according to the following order: H2 < N2 < CO2. The result offers theoretical predictions and direction for the experimental synthesis of such MOF materials built by these different base-pair building blocks.

Key words: Base pair-Zn2+ complex, M062X method, Adsorption, Hydrogen bond, Small molecule, Metal-organic framework(MOF) material

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