Abstract
The photochemical reactions of Mo(CO) 6 with 9,10-phenanthrene and 1,2-acenaphthene semiquinone radicals (PSQ, ASQ) were investigated by EPR. The photoirradiation produces the paramagnetic complexes in which the semiquinones coordinate to Mo(CO) 4 in the chelate form. Most unpaired electron densities populate the quinone ligands, but the spin densities delocalize onto the metal moiety more so in the PSQ complex than in the ASQ complex. This difference in the spin distribution with ligands is interpreted in terms of the MO theory. To confirm the reaction scheme proposed for the above reactions, the reactions between the semiquinone radicals and Mo(CO) 5(s) (s = solvent molecule), which were prepared by photoirradiation to Mo(CO) 6 in tetrahydrofuran or in 1,2-dimethoxyethane, were also examined.
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