SYNTHESIS OF NEW HETERODINUCLEAR AMINOCARBYNE COMPLEXES - CRYSTAL-STRUCTURES OF [AUW(MU-CN(ET)ME)(C6F5)(CO)(2)-(ETA-C5H5)] AND [(CUW( [(CUW(MU-CN(ET)ME)CI(CO)(2)(ETA-C5H5))(2)]

The aminocarbyne [W{=CN(Et)Me}(CO)(2)(cp)] 1 (cp=eta-C5H5) reacts with [Au(C6F5)(tht)] (tht= tetrahydrothiophene) and CuCl to give the adduc ts [AuW{mu-CN(Et)Me}(C6F5)(CO)(2)(cp)] 2 and [{CuW{mu-CN(Et)Me}Cl(CO)( 2)(cp)}(2)] 3 respectively which have been structurally,characterized by X-ray diffraction. Complex 2 Crystallizes in space group P $($) ove r bar$$ 1, a = 9.840(5), b = 11.577(6), c = 8.296(6) Angstrom, alpha = 99.03(5). beta = 91.01(6), gamma = 81.92(4)degrees, Z = 2. Complex 3 crystallizes in space group P2(1)/a, a = 7.788(2), b = 14.880(5), c = 11.712(5) Angstrom, beta = 95.35(3)degrees, Z = 2. Both adducts exhibi t a molecule of 1 bonded to Au(C6F5) or Cu2Cl2 fragments, respectively . through one of the W-C(carbyne) pi bonds. A WCM ring is formed in wh ich 1 preserves most of its identity and the coinage metals attain the ir preferred electron Counts. The cationic Group 11 fragments [M(PPh(3 ))(+)] (M = Cu, Ag or Au) also react with complex to form [M{W[mu CN(E t)Me](CO)(2)(cp)}(2)](+) 5; when M = Au NMR spectroscopy indicates tha t in addition to the trinuclear species 5. the dimetallacyclopropene [ AuW{mu-CN(Et)Me}(CO)(2)(cp)(PPh(3))](+) 4 is also present. All these a dducts have been spectroscopically characterised.