Author/Authors :
Podyachev، نويسنده , , Sergey N. and Gubaidullin، نويسنده , , Aidar T. and Syakaev، نويسنده , , Victor V. and Sudakova، نويسنده , , Svetlana N. and Masliy، نويسنده , , Aleksey N. and Saifina، نويسنده , , Alina F. and Burmakina، نويسنده , , Nadezda ?. and Kuznetsov، نويسنده , , Andrey M. and Shagidullin، نويسنده , , Roald R. and Avvakumova، نويسنده , , Ludmila V. and Konova، نويسنده ,
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.
Keywords :
complexation , crystal structure , Hydrazide , DFT studies , Conformation
