Theoretical calculations were carried out to determine the interaction energy between a thioglycoluril, TGL, as a host molecular clip, and phenol derivatives as the guest molecules (host-guest complex, 1 OH-XH ). The theoretical calculations on TGL, phenol derivatives, and 1 OH-XH (X = O, NH, and COO) were performed, using a hybrid functional closedshell RB3LYP and the 6-31G * basis set, employing Gaussian 03. The energetic and geometric parameters, especially the bond lengths, were investigated for TGL, phenol derivatives and 1 OH-XH . Those parameters were compared to glycoluril, GL molecule (host-guest complex, 2 OH-OH ).
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