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Color-tunable and highly emissive solid materials constructed from tetraphenylethylene-o-carborane-based building blocks: Synthesis, aggregation-induced emission, and photophysics.

This work synthesized a novel kind of expanded tetraphenylethylene (TPE)-carborane-TPE pentad by using two adjacent carborane moieties as central bridges and three TPE units in lateral positions. Its solid-state fluorescence quantum yield was substantially increased to 68.2% by expanding the number of bridges between carborane and TPE. Subsequently, the emission color shifted from blue to orange-yellow (126 nm). Mechanical insights into the electronic structure of the extended TPE-carborane-TPE pentads were obtained from Density functional theory (DFT) calculations.