Exploring ligand-stabilized polycationic antimony complexes for bond activation chemistry

Abstract

This study focuses on the synthesis and stabilization of polycationic diantimony complexes through the design of novel ligand systems. These ligands were successfully prepared and characterized using NMR spectroscopy. In an effort to access ligand-stabilized diantimony species, a series of dicationic and tricationic monomeric antimony complexes was synthesized. These compounds were comprehensively characterized in both ‘solid’ and ‘solution states’ by ‘single-crystal X-ray diffraction’ ‘(SC-XRD)’ and ‘multinuclear NMR spectroscopy’, which includes “1H, 13C{1H}, 19F{1H}” techniques. The ‘redox properties’ of the cationic species were thoroughly studied by ‘Cyclic Voltammetry’, while their ‘Lewis acidity’ was measured through the ‘Gutmann-Beckett method’ monitored by 31P{1H} NMR spectroscopy. Furthermore, two oxo-bridge diantimony complexes-one homoleptic and one heteroleptic were synthesized and structurally characterized by SC-XRD. In addition, an anionic antimony as well as a neutral antimony complex were successfully prepared and characterized. Finally, the electronics properties of all synthesized compounds were studied through computational analysis, providing deeper insight into their structural and electronic behaviours.