Abstract
The 546 nm continuous irradiation of acidic aqueous solutions of CO(NH 3) 5N 3 2+ and acrylamide (AA) results in the formation of polyacrylamide. Excitation of Co(NH 3) 5N 3 2+ yields and N 3 ∗ radicals; the latter species initiate the free-radical chain reaction via oxidative electron and/or H atom transfer with the monomer. The positive dependence of the rate of polymerization on the square root of the absorbed light intensity and [AA] suggests that the termination step of the chain reaction involves the mutual annihilation of the macroradicals. ESR spin-trapping experiments demonstrate unequivocally that N 3 ∗ radicals are present in the system CO(NH 3) 5N 3 2+ is a suitable photosensitizer for the initiation of free-radical polymerization with visible light.
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