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We report the synthesis of an original ligand scaffold based on a dimethyl-cyclen platform Medo2pa with two dithienylethene units attached to each picolinate arm and the corresponding yttrium(III), europium(III) and ytterbium(III) complexes. All three compounds show reversible photochromism with high photo-conversions. Photoluminescence experiments demonstrate that this design is versatile and adapted for both europium and ytterbium emission switching when measured in frozen organic glasses at 77 K. The OFF/ON luminescence ratio is excellent in the case of europium (4 to 8%) and still quite good in the case of ytterbium (around 13%).

Efficient luminescence control in dithienylethene functionalized cyclen macrocyclic lanthanide complexes