Metal substitution reaction in the cluster (mu-H)(2)Fe-3(mu(3)-Se)(CO)(9) .2. Crystal and molecular structure of [FeW2(mu(3)-Se)(CO)(7)-Cp(2)] and [FeMoW(mu(3)-Se)(CO)(7)Cp(2)] (Cp=eta(5)-C5H5)

The sequential substitution of two Fe(CO)(3) groups in [(mu-H)(2)Fe-3(mu(3)-Se) (CO)(9)] with isolobal fragments CpW(CO)(2) (the first stage) and CpMo(CO), (the second stage) has been shown to result in the title heterotrimetal cluster [FeMoW(mu(3)-Se) (CO)(7)Cp(2)]. Its structure and the structure of its [FeW2(mu(3)-Se)(CO)(7)Cp(2)] analog obtained previously have been determined by X-ray analysis. Copyright (C) 1996 Elsevier Science Ltd