Boron‐Functionalized Phosphorescent Iridium(III) Complexes

Abstract

Boron-based motifs, introduced into π-conjugated systems in various forms (e.g., triarylboranes, borate dyes, and boron clusters), have attracted much attention owing to their unique electronic and structural features. Recently, organoboron groups -mainly triarylboranes and boron clusters (carboranes) -that exhibit highly polarizable σ-aromatic character and strongly electron-withdrawing properties have been widely incorporated into phosphorescent Ir III complexes. These organoboron groups make significant contributions to the ex-

Water-Stable Carborane-Based Eu3+/Tb3+ Metal–Organic Frameworks for Tunable Time-Dependent Emission Color and Their Application in Anticounterfeiting Bar-Coding

“…This unusual electronic structure is often highlighted by considering carboranes as inorganic three-dimensional “aromatic” analogues of arenes . In this regard, for the last 25 years, a remarkable influence of icosahedral carboranes on the photophysical properties of organic fluorophores − or in their transition metal compounds has been reported. ,− However, as far as we know, there are no reports on luminescence properties of carborane-based MOFs and therefore the antenna effect has not yet been reported for a carborane linker.…”

Fine-Tuning Electronic Properties of Luminescent Pt(II) Complexes via Vertex-Differentiated Coordination of Sterically Invariant Carborane-Based Ligands

“…Carboranes are chemically and thermally robust icosahedral boron-rich clusters with unique electronic properties and have recently been incorporated into cyclometalating ligands used in many luminescent transition metal complexes . In contrast to aryl-based ligand frameworks that are typically limited to forming carbon–metal bonds, carboranes can covalently bond with a metal center through both carbon and boron vertices or interact with a metal center noncovalently upon deboronation and formation of the formally anionic nido -carboranyl species .…”

Ru(ii) and Ir(iii) phenanthroline-based photosensitisers bearingo-carborane: PDT agents with boron carriers for potential BNCT

“…66 Since the first works from Lee et al 67 and Yan et al 68 of carborane iridium(III) complexes, many different iridiumcarborane systems have been reported with diverse uses as chemosensors, or for bioimaging, among others. [69][70][71][72][73][74][75][76] Less developed are those metal-carborane systems peripherally bonded to other metal centres such as gold, 77,78 silver, 79 palladium, 80 or copper. 81 While examples of ruthenacarboranes are found in the literature, 82 strikingly there are no trisbidentate Ru(II)-carborane metal complexes reported.…”