Synthesis, structure, and reactivity of N-O and N-N donor-based complexes of boron

Abstract

This thesis explores the diverse applications of bidentate ligands like N-O (salicylaldimine)and N-N (aminotroponiminates, ATIs) donors, along with the N-heterocyclic olefines. These ligands play a vital role in stabilizing boron complexes in both neutral and cationic states. This thesis delves into the versatile chemistry of N, N′-based mono ATIs, bis(ATIs), along with NHOs and N, O donor ligands, focusing on their role in the synthesis of fluorescent boron complexes and their subsequent use in the isolation of reactive borenium cations. ATIs ligands, with their strong electron-donating properties and steric tunability, serve as ideal scaffolds for stabilizing reactive species, enabling the isolation of both low valent as well as cationic complexes of semi(metals) across the periodic table. The synthesis of these complexes, however, presents significant challenges, including the precise control of reaction conditions to prevent unwanted side reactions such as disproportionation. Overcoming these challenges has enabled the successful synthesis of boron complexes and their corresponding boron cationic species.