Alteration of intramolecular electronic transition deboronation of carbazole-based -carboranyl compound and intriguing 'turn-on' emissive variation.

The conversion of -carborane-containing compounds to the -species deboronation causes photophysical changes that could be used for sensing applications. 9-Methyl-9-carbazole-based - (-Cz) and -carboranyl (-Cz) compounds were prepared and fully characterised by multinuclear NMR spectroscopy and elemental analysis, and the solid-state molecular structure of -Cz was analysed by X-ray crystallography. Although the -compound exhibited an emissive pattern centred at = .

Strategic molecular design of -carboranyl luminophores to manifest thermally activated delayed fluorescence.

In this paper, we propose a strategic molecular design of -carborane-based donor-acceptor dyad system that exhibits thermally activated delayed fluorescence (TADF) in the solution state at ambient temperature. Planar 9,9-dimethyl-9-fluorene-based compounds with - and -carborane cages appended at the C2-, C3-, and C4-positions of each fluorene moiety (-type: , , , and , and -type: - = [-form of ]·[NBu]) were prepared and characterized. The solid-state molecular structure of exhibited a significantly distorted fluorene plane, which suggests the existence of severe intramolecular steric hindrance.