Atomic-Scale
Insight into Tautomeric Recognition,
Separation, and Interconversion of Guanine Molecular Networks on Au(111)
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Abstract
Although
tautomerization may directly affect the chemical or biological
properties of molecules, real-space investigation on the tautomeric
behaviors of organic molecules in a larger area of molecular networks
has been scarcely reported. In this paper, we choose guanine (G) molecule
as a model system. From the interplay of high-resolution scanning
tunneling microscopy (STM) imaging and density functional theory (DFT)
calculations, we have successfully achieved the tautomeric recognition,
separation, and interconversion of G molecular networks (formed by
two tautomeric forms G/9H and G/7H) with the aid of NaCl on the Au(111)
surface in ultrahigh vacuum (UHV) conditions. Our results may serve
as a prototypical system to provide important insights into tautomerization
related issues, which should be intriguing to biochemistry, pharmaceutics,
and other related fields