A density functional theory study on the intramolecular proton transfer in 6-thioguanine and alkali metal cations substituted derivatives (M-TG, M=Li+, Na+, K+)

2012 ◽  
Vol 1002 ◽  
pp. 37-42 ◽  
Author(s):  
Jiao-Qiang Zhang ◽  
Chang-Ming Shi ◽  
Wen Wan ◽  
Tie-Zheng Ji ◽  
Na Yi
Keyword(s):  
Density Functional Theory ◽  
Alkali Metal ◽  
Proton Transfer ◽  
Density Functional ◽  
Metal Cations ◽  
Intramolecular Proton Transfer ◽  
Density Functional Theory Study ◽  
Alkali Metal Cations ◽  
Functional Theory

Theoretical study on supramolecular chemistry of alkali-metal cations with crown ether derivatized thiophenes

2014 ◽  
Vol 13 (04) ◽  
pp. 1450029 ◽  
Author(s):  
Qin Wang ◽  
Mi Li ◽  
Xue-Ye Wang ◽  
Ling Li
Keyword(s):  
Density Functional Theory ◽  
Crown Ether ◽  
Alkali Metal ◽  
Density Functional ◽  
Driving Forces ◽  
Lone Pair ◽  
Metal Cations ◽  
Theoretical Research ◽  
Alkali Metal Cations ◽  
Functional Theory

This paper describes systemically a theoretical research on the interaction of alkali-metal cations ( Li +, Na +, K + and Rb +) with five different crown ether derivatized thiophenes using density functional theory (DFT). The fully optimized geometries have been performed with real frequencies which indicate the minima states. The optimized structures and electronic properties, such as HOMO and LUMO energies, bandgaps of the free ligands L (L1-L5), the complexes L/M+ ( Li +, Na +, K + and Rb +) have been performed at B3LYP/6-31+G(d,p) and Lanl2DZ level. Natural bond orbital (NBO) and frequency analysis are discussed on the basis of the optimized geometric structures. The main driving forces of the coordination in host–guest molecules are investigated, the electron-donating O offers lone pair electrons to the contacting LP* (1-center valence antibond lone pair) of alkali-metal cations. In addition, the transition energies are calculated by the time-dependent density functional theory (TD-DFT).

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