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- W1998724172 abstract "Transition metal carbonyl clusters incorporating group 6 (molybdenum, tungsten) and iridium atoms in a tetrahedral or butterfly-shaped four-atom cluster core, together with carbonyl, cyclopentadienyl and alkyne ligands, have been synthesized and incorporated into oligourethanes, and their optical limiting properties assessed by open-aperture Z-scan (ns pulses, 523 nm) and time-resolved pump-probe studies (ps pulses, 527 nm). The Z-scan studies reveal that the tetrahedral [M<sub>2</sub>Ir<sub>2</sub>] cluster cores (M = Mo, W) displayed a greater effective nonlinear absorption coefficent β<sub>2</sub> than the [MoIr<sub>3</sub>] cores; the tungsten example, W<sub>2</sub>Ir<sub>2</sub>(CO)<sub>10</sub>(η-C<sub>5</sub>H<sub>5</sub>)<sub>2</sub>, exhibited the highest response. Substitution at the cyclopentadienyl group (including incorporation into a polymer backbone) had little effect on the response measured. A time-resolved investigation of the alkyne-adduct Mo<sub>2</sub>Ir<sub>2</sub>(μ<sub>4</sub>-η<sup>2</sup>-MeC<sub>2</sub>Ph)(CO)<sub>8</sub>(η-C<sub>5</sub>H<sub>4</sub>Me)<sub>2</sub> using picosecond pulses at 527 nm reveals optical-power-limiting behaviour that results from electronic processes [specifically, a fast nonlinear absorption process followed by reverse saturable absorption involving long-lived (>1000 ps) metastable excited states]." @default.
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- W1998724172 date "2003-11-11" @default.
- W1998724172 modified "2023-09-28" @default.
- W1998724172 title "Syntheses, characterization, and optical limiting properties of heterometallic cluster-containing polymers" @default.
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- W1998724172 doi "https://doi.org/10.1117/12.505289" @default.
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