The photo-induced substitution o f carbonyl ligands in the binuclear cyclopentadienyl-type complexes (CO)3M[C5H4(CH2)„C5H4]M(CO)3 (n = 0 (fulvalene), M = Mn (1) and Re (2); n = 1 (bis(cyclopentadienyl)methane), M = Mn (3) and Re (4)) has been studied in the presence o f tetrahydrothiophene, SC4H8 (tht). Photodecarbonylation o f 1 -4 in tetrahydrofuran solution leads to solvent-stabilized interm...