in tetrahydrofuran Sb-compound in THF added to Yb-complex in THF, kept at room temp. for 24h under vac.; washed with hexane, dried in vac., solvent removed; elem. anal.;

in tetrahydrofuran Sb-compound in THF added to Yb-complex in THF, kept at room temp. for 24h under vac.; washed with hexane, dried in vac., solvent removed; elem. anal.;

in tetrahydrofuran Sb-compound in THF added to Yb-complex in THF, kept at room temp. for 24h under vac.; washed with hexane, dried in vac., solvent removed; elem. anal.;