Versatile heteroleptic bis-terdentate Cr(III) chromophores displaying room temperature millisecond excited state lifetimes

Substitution of Ru(II)-based chromophores with cheaper Cr(III)-
based complexes in optically active metallo-supramolecular architectures
is limited by the lack of synthetic strategies leading to
heteroleptic Cr(III)-polypyridyl complexes with long excited-state
lifetimes. Herein, we report on a versatile method yielding heteroleptic
bis(terdentate) Cr(III) complexes with room temperature
millisecond range excited-state lifetimes, tuneable electronic and
photophysical properties and easy anchoring possibilities.