The Synthesis and Properties of Spirophenanthrene.

Motivated by the success of 9,9'-spirobifluorene () in optoelectronic materials, we synthesized a novel spiro compound, spirophenanthrene (). Incorporating a phenanthrene unit as the core, we aimed to leverage the π-conjugation of to surpass the limitations of . Experimental and theoretical studies revealed significant advantages over , including red-shifted wavelengths, tunable LUMO energy levels, and enhanced thermal stability.

Synthesis, Characterization, and Properties of Sila-Annulated Phenanthrene Imides.

A series of sila-annulated phenanthrene imides were synthesized through a three-step synthetic route, which represent a hybrid class of biphenyl-based π-conjugated molecules incorporating an imide unit and silole. A comprehensive investigation of their structural, photophysical, and electronic properties was studied by experiment and theoretical calculations. Notably, sila-annulated phenanthrene imides with significant aggregation-induced emission (AIE) properties were observed.