Effect of Solvation on Pinched Cone-Pinched Cone Interconversion of Tetraethoxycalix[4]arene and Tetraethoxythiacalix[4]arene

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Authors

MATOUŠEK Jiří KULHÁNEK Petr ČAJAN Michal KOČA Jaroslav

Year of publication 2006
Type Article in Periodical
Magazine / Source Journal of Physical Chemistry A
MU Faculty or unit

Faculty of Science

Citation
Field Physical chemistry and theoretical chemistry
Keywords calixarene; calix[4]arene; molecular dynamics; force field; free energy calculations; solvent
Description The pinched cone-pinched cone interconversion (PCI) of tetraethoxy substituted calix[4]arene and thiacalix[4]arene was studied by means of molecular dynamics using the GAFF force field and quantum mechanics. Influence of solvent was expressed by changes in cavity geometries as well as in free energy barriers that were calculated using constrained MD simulations. Water and chloroform were found to reduce the energy barriers in comparison with vacuum simulations. Only qualitative agreement between energy barriers calculated by MD and experimental values was achieved. Also, quantum chemical calculations were performed with the RI-MP2 method, and a better description of PCI was achieved than that previously obtained by HF or DFT methods. The combination of qualitative MD data on solvated systems with RI-MP2 gas-phase data gave us very good agreement with experimental results.
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