ArticleChemical science2026
Pyrazine-embedded N^N^N-chelating tetracoordinate organoboron polycyclic heteroaromatics with low-lying LUMO levels and near-infrared luminescence.
Article in Chemical science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Pyrazine-based acceptor engineering offers an effective approach to lowering molecular orbital energies and developing near-infrared (NIR) luminophores, but remains less developed in tridentate-type tetracoordinate organoboron systems. Herein, we report a series of N^N^N-chelating tetracoordinate organoboron-fused heteroarenes constructed by combining an electron-deficient pyrazine core with tunable skeleton fusion. This molecular design effectively modulates the molecular geometry and electronic structure, leading to stabilized lowest unoccupied molecular orbital (LUMO) levels, narrowed optical band gaps, and distinct π-electron localization. As a result, the double boron-fused compounds exhibit markedly red-shifted absorption with molar extinction coefficients exceeding 1.0 × 10
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