Heterometallic Chalcogenido Clusters Containing Lanthanides and Main Group Metals: Emissive Precursors to Ternary Solid-State Compounds

Heterometallic clusters containing lanthanides and the group 12 metals can be isolated as
crystalline compounds in high yields. These products [(py)8Ln4M2Se6(SePh)4 (Ln = Er, Yb, Lu; M = Cd,
Hg)] adopt a double cubane structure with the covalent M occupying an opposing pair of external metal
sites. Both Er/M compounds are strongly emissive materials, with emission lifetimes of 1.41 ms (Er/Cd)
and 0.71 ms (Er/Hg) and with the Er/Cd radiative quantum efficiency twice that of the Er/Hg compound.
Thermal decomposition of the Er/Cd and Yb/Cd compounds at 650 °C give the ternary solid-state materials
CdLn2Se4.