Cocondensation of atoms of the lanthanide elements with 1,3,5-tri-t-butyl benzene gives the thermally stable bis(q-arene)lanthanide(O) sandwich compounds for the lanthanides Nd, Tb, Dy, Ho, Er, and Lu, thermally unstable complexes for La, Pr and Sm, and unisolable materials for Ce, Eu, Tm, and Yb; a simple bonding model is proposed to account for the stability trends, and for the magnetism of the stable complexes.
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