| Popis: |
Reactions between Ph n SiH 4− n or HR 2 SiXSiR 2 H and HCCo 3 (CO) 9 are described. Both the monocluster, HMe 2 SiXSiMe 2 CCo 3 (CO) 9 , and the dicluster, (CO) 9 Co 3 CMe 2 SiXSiMe 2 CCo 3 (CO) 9 , complexes were obtained from the silanes HMe 2 SiXSiMe 2 H (X=O, 1,4-C 6 H 4 ). RSiH 2 CCo 3 (CO) 9 (R=Ph, Me) or sterically demanding silanes do not couple with HCCo 3 (CO) 9 . Generally with Ph n SiH 4− n ( n =1, 2) electrophilic attack on the cluster core resulted in the formation of the novel μ-silylene complexes HCCo 3 (CO) 8 (μ-SiR 2 ), and fragmentation of the Co 3 C unit, instead of the expected silicon-bridged diclusters. Electrochemical investigation of the dicluster compounds and their phosphite derivatives showed there was no interaction between the cluster redox centres. |
