Praseodymium and Erbium 1,2,4-Triphenylcyclopentadienyl Complexes

The reaction of triphenylcyclopentadienyl potassium with praseodymium and erbium chloride tetrahydrofuranates gives, depending on the reactant ratio, tetranuclear ate complexes, [{(Ph 3 C 5 H 2 )-Pr(THF)} 2 (µ 2 -Cl) 2 (µ 3 -Cl) 3 K] 2 (C 7 H 8 ) 4 ( I ) and [{(Ph 3 C 5 H 2 )Er(THF)} 2 (µ 2 -Cl) 2 (µ 3 -Cl) 3 K(THF)] 2 ( III ), or binuclear ate complexes [(Ph 3 C 5 H 2 ) 2 LnCl(KCl)] 2 Ln = Pr ( II ), Er ( IV ) (CCDC nos. 2224244 ( I ), 2224243 ( II ), 2224245 ( III ), 2224242 ( IV )). The structurally similar complexes I and III are based on the {[Ln 2 (µ-Cl) 3 ] 2 (µ-Cl) 2 K 2 } core, and in III , the potassium cation is additionally coordinated to the THF molecule. The isostructural complexes II and IV have the binuclear [Ln(µ-Cl) 2 K] 2 core.