H-Aggregated π-Systems Based on Disulfide-Linked Dimers of Dipyrrolyldiketone Boron Complexes.

Dipyrrolyldiketone boron complexes linked by a disulfide bond were synthesized, forming H-aggregated dimers assisted by intramolecular π-π and hydrogen-bonding interactions. The conformations of the dimers, with small C-S-S-C dihedral angles, were examined by UV-vis absorption and 1H NMR spectra as well as single-crystal X-ray analysis and theoretical studies.