Significant Phosphine Ligand Effect on the Photochemical Reactivity of (1+) (N-N=1,10-phenanthroline or 2,9-dimethyl-1,10-phenanthroline; L=tertiary phosphine)

Article abstract of DOI:10.1039/DT9880001641

Photo-induced electron-transfer reactions between (1-) and (1+) have been investigated.Although (1+) exhibits rather low photochemical reactivity, substituting PPh3 by a bulky and/or donative phosphine significantly enhances the reactivity.In the case of N-N=dmphen, introducing a donative phosphine, P(C6H4OMe-p)3, instead of PPh3 remarkably increases the photochemical reactivity, but in the case of N-N=phen, substituting PPh3 by a donative and bulky phosphine such as P(C6H11)3 much improves the photochemical reactivity.A kinetic study has also been carried out and it is concluded that this reaction proceeds via a dynamic quenching mechanism.Phosphine ligand effects are discussed in terms of the lifetime of the excited copper(I) complexes and the facility of formation of the encounter complex.

Full text of DOI:10.1039/DT9880001641

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