Photochromism in the di-.pi.-cyclopentadienylhexacarbonyldimolybdenum(1+) bromide(1-) system

Photochemistry of cyclopentadienylmolybdenum and cyclopentadienyltungsten carbonyl halide complexes

“…m-Re(CO)4(PPh3)X + CO (18) As shown in Table IV, 366-and 436-nm quantum yields for PPh3 substitution of CpM(CO)3X complexes are independent of entering ligand concentration over the range 5.0 X KTMO.O X 10~3 M, the metal complex concentration being 1.0 X 10"3 M. The quantum yields decrease markedly for solutions saturated with carbon monoxide (Table III), paralleling the observations made for PPh3 substitution of CpFe(CO)2X8 and CpV(CO)4.9 These results strongly suggest that photosubstitution of CpM(CO)3X involves dissociation of carbon monoxide and are best accounted for by eq [19][20][21][22][23].…”

Photochemistry of metal-metal bonds

“…An example is illustrated in Figure 6 which also follows from Figure 4 but deals specifically with (7j5-C5H5)2Mo2(CO)6 which is known to undergo photochemically induced disproportionation in the presence of halide ions, eq 26. [38][39][40] In Figure 6 the same electronic structural details with regard to the metal-metal bond are assumed as in Figure 4 but the presence of Bris included. Under these conditions photochemically induced disproportionation to give (ijs-C6H5)Mo(CO)3Br and (t/5-C5H5)-Mo(CO)3-occurs.…”