SI-O-BASED INORGANIC RING-SYSTEMS CONTAINING F-ELEMENTS - STRUCTURAL CHARACTERIZATION OF NOVEL SILOXANEDIOLATES OF THE LANTHANIDES AND ACTINIDES

Depending on the reaction conditions and the ionic radius of the lanth anide ion, tetraphenyldisiloxanediol, (Ph2SiOH)(2)O, reacts with [Ln{N (SiMe3)(2)}3{LiCl(thf)(3)}(3)] (Ln = Eu, Ga, Sm) to afford novel heter obimetallic rare earth disiloxanediolates, some of which can be regard ed as 'inorganic lanthanide metallocenes'; a ring expanded uranium(VI) derivative, [U{Ph2Si(OSiPh2O)(2)}(2){(Ph2SiO)(2)O}] 4, is formed upon treatment of uranocene, [U(eta(8)-C8H8)(2)], With (Ph2SiOH)(2)O.