REACTIONS OF CYCLOPENTADIENYL-NAPHTHALENE COMPLEXES OF LUTETIUM WITH C-UNSATURATED AND N-UNSATURATED COMPOUNDS - MOLECULAR AND CRYSTAL-STRUCTURE OF LU(DME)](2)[1,1-MU-4,4-MU-(PH)C-(PH)C=C(PH)-C(PH)]

The naphthalene derivative of cyclopentadienyllutetium CpLuC(10)H(8)(T HF)(2) (1b) (THF-tetrahydrofuran) easily reacts with azobenzene in THF solution to give a dimeric diphenylhydrazido complex [CpLu(THF)](2)(P h(2)N(2))(2) (2). Interaction of CpLuC(10)H(8)(DME) (1a) (DME = 1,2-di methoxyethane) with diphenylacetylene results in C-C coupling and form ation of a new type of dinuclear complex with tetracharged bridging [C (4)Ph(4)](4-) ligand: Lu(DME)](2)[1,1-mu-4,4-mu-(Ph)C-C(Ph)=C(Ph)-C(Ph )] (3). The structure of benzene solvate of 3 was determined by X-ray diffraction method (orthorhombic; (a = 14.266(8), b = 15.625(7) and c = 21.612(10) Angstrom space group, Pbcn, Z = 4,2266 reflections with F > 4 sigma(F), R = 0.039). In the molecule of 3 there are two CpLu uni ts joined by a C(4)Ph(4) ligand. The shortest Lu-C mu(2) distances 2.2 80(7) and 2.336(7) Angstrom are observed between Lu atoms and end C at oms of C-4 fragment. The crystal of 3 contains two enantiomeric forms of molecules connected by symmetry elements. The X-ray data together w ith the diagmagnetism of 3 suggest in dialkylidene type of bridging li gand in this complex.