The synthesis of FpMeSi(CH 2 ) 4 SiMeFp (1a) is reported (Fp ) [(η 5 -C 5 H 5 )Fe(CO) 2 ), along with small amounts of [FpMeSi(CH 2 ) 4 SiMe] 2 O (2). Photolysis of 1a with a medium-pressure Hg lamp for 8 h resulted in the formation of two different types of intermediate silylenebridged complexes, [(η 5 -C 5 H 5 )Fe(CO)] 2 (µ-CO)(µ-SiMeSi(CH 2 ) 4 ) ( 4) and [(η 5 -C 5 H 5 )Fe(CO)] 2 (µ-CO)(µ-Si(CH 2 ) 4 SiMe 2 ) (5), each existing as a mixture of three equilibrating geometrical isomers, respectively; 4 slowly photoisomerized to the isomers 5 prior to expulsion of the second CO group. Prolonged irradiation of 5 gave a mixture of the cis and trans isomers of the bis(silylene)-bridged complex [(η 5 -C 5 H 5 )Fe(CO)] 2 (µ-SiMe 2 )(µ-Si(CH 2 ) 4 ) (6). Similar photolysis of FpMePhSiSiPhMeFp (3) resulted in the sequential formation of the mono(silylene)diiron complex [(η 5 -C 5 H 5 )Fe(CO)] 2 (µ-CO)(µ-SiMeSiMePh 2 ) (7) and the bis(silylene)diiron complex [(η 5 -C 5 H 5 )Fe(CO)] 2 (µ-SiPh 2 )(µ-SiMe 2 ) (8). The molecular structures of 1a, 5a, and 6a have been determined by X-ray diffraction analysis.