PREPARATION AND CRYSTAL-STRUCTURES OF H2](2)[MO(CO)(2)(ETA(5)-C5H5)](2)CENTER-DOT-CHCL3, AND SBPH[FE(CO)(2)(ETA(5)-C5H5)](2)

Antimony is reduced when [SbPh2BrO](2) is treated with Na[Mo(CO)(3)(et a(5)-C5H5)] to produce [mu-SbPh2](2)[Mo(CO)(2)(mu(5)-C5H5)](2). A stru cture determination shows diphenylstibido groups bridging between two Mo(CO)(2)(eta(5)-C5H5) moieties giving a central 'butterfly' shaped Sb 2Mo2 ring. The cyclopentadiene rings are trans to each other and Mo-Sb and Sb-Sb separations are both short. An iron analogue could not be o btained from [SbPh2BrO](2) and Na[Fe(CO)(2)(eta(5)-C5H5)] but a mixtur e of SbPh[Fe(CO)(2)(eta(5)-C5H5)](2) and SbPh2[Fe(CO)(2)(eta(5)-C5H5)] was obtained using SbPh2Cl. An X-ray structure for SbPh[Fe(CO)(2)(eta (5)-C5H5)](2) shows an open stibinidine structure. (C) 1998 Elsevier S cience S.A. All rights reserved.