253. Tethered Enantiopure Boramidines for Advanced Chiroptical Studies
     Nidal Saleh, Valerio Zullo, Estefanía Sucre-Rosales, Lorenzo Arrico, Francesco Zinna, Gennaro Pescitelli, Céline Besnard, Eric Vauthey, Jérôme Lacour
     Chem. Eur. J. 2025, e202500490

Boramidines are promising chromophores capable of circularly polarized luminescence (CPL). The synthesis, characterization, and photophysical analysis of novel BINOL- and H8-BINOL-tethered boramidines 1 and 2 are reported, leveraging the chiral perturbation strategy for CPL material design. These enantiopure compounds, prepared in a concise three-step synthesis, exhibit high fluorescence quantum yields f (up to 95% in N₂-saturated solutions) and luminescence dissymmetry factors (|g_lum| ~10^-³). Transient absorption spectroscopy and quantum-chemical calculations provide insight into their singlet-triplet spin-orbit coupling and intersystem crossing mechanisms.

DOI : 10.1002/chem.202500490 

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