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We present the measurements of the third-order polarizability (gamma) of several platinum poly-ynes obtained using picosecond laser pulses. The real part of gamma was measured using the optical Kerr effect with a 1.064-microm pump and a 0.532-microm probe. The imaginary part was evaluated from the two-photon absorption coefficient determined at 0.532 microm. The platinum poly-ynes had low absorption in the visible and the near-infrared wavelengths.

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Preliminary results with chelated Fem and H2O2 indicate the formation of hydroxyl radicals (see Table I).Similar experiments were performed with 0.05 M 2-and 3-POBN and 0.05 M sodium persulfate for comparison with 4-POBN. The hydroxy adduct of 3-POBN gives a spectrum wherein the hfsc from the hydroxy proton is barely resolved:

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