Xiaofei Sun, Maxim Leskov, Sebastian Gillhuber, Chiara Kirchner, Masaichi Saito, Florian Weigend, Peter W Roesky
We present a new class of linear dianionic sandwich-type species of Sm(II), Eu(II) and Yb(II), in which the central metal ion is exclusively coordinated by two planar dianionic heterocycles. These complexes were synthesized by salt metathesis. Treatment with (2.2.2)-cryptand or 18-crown-6 afforded ion pairs featuring linear monomeric bis(metalollediide) Ln(II) sandwich dianions.