Twisted Charge-Transfer Antennae for Ultra-Bright Terbium(III) and Dysprosium(III) Bioprobes.

The design of original twisted charge transfer antennae in which a non-planar geometry is enforced thanks to one or two bulky ortho-Me substituents allows us to prepare the corresponding ultra-bright Tb and Dy bioprobes. The brightness of the Tb derivative compares well with that of the benchmark Tb-Lumi4 complex. The first bio-imaging experiments with a Dy luminescent bioprobe are also reported.