Chem. J. Chinese Universities ›› 2014, Vol. 35 ›› Issue (7): 1492.doi: 10.7503/cjcu20140137

• Physical Chemistry • Previous Articles     Next Articles

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)

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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