Abstract
The structural peculiarities of tetrathiacalix[4]arenes with acetylhydrazide substitutes in cone and 1,3 -alternate conformations have been determined by means of X-ray analysis, IR and NMR spectroscopy. The structural and molecular modeling data were used in the interpretation of binding properties of calix[4]arene tetrahydrazides. The quantum-chemical calculations at the DFT level using the PBE exchange–correlation functional were performed for the complexation of 1,3 -alternate conformer of tetrathiacalix[4]arene with Ag + ion. It was shown that the removal of tert-butyl groups from tert-butyltetrathiacalix[4]arene platform facilitates a bis-ligand coordination of the metal ion and leads to a remarkable increase of Ag + extraction efficiency.
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