Complex (CpCe)(TCNQ)(CeCp) (1) was prepared by reducing neutral TCNQ (tetracyanoquinodimethane) with CpCe(THF). Two types of cerium centres with a dianionic TCNQ moiety are present in 1, wherein each of the four cyano-groups are bound by a cation. Formation of this trapped-valent organocerium compound 1 is facilitated by metal-ligand redox cooperativity. Characterization of 1 was carried out using structural-, magnetometry-, and IR-spectroscopic analyses. Photophysical studies on this compound reveal Ce luminescence, and opens up avenues for promising multifunctional, mixed-valent lanthanide materials.
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