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Syntheses, characterization, and optical limiting properties of heterometallic cluster-containing polymers
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Paper 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 [M2Ir2] cluster cores (M = Mo, W) displayed a greater effective nonlinear absorption coefficent β2 than the [MoIr3] cores; the tungsten example, W2Ir2(CO)10(η-C5H5)2, 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 Mo2Ir242-MeC2Ph)(CO)8(η-C5H4Me)2 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].

Paper Details

Date Published: 10 November 2003
PDF: 8 pages
Proc. SPIE 5212, Linear and Nonlinear Optics of Organic Materials III, (10 November 2003); doi: 10.1117/12.505289
Show Author Affiliations
Nigel T. Lucas, Australian National Univ. (Australia)
Eleni G. A. Notaras, Australian National Univ. (Australia)
Mark G. Humphrey, Australian National Univ. (Australia)
Marek Samoc, Australian National Univ. (Australia)
Barry Luther-Davies, Australian National Univ. (Australia)

Published in SPIE Proceedings Vol. 5212:
Linear and Nonlinear Optics of Organic Materials III
Mark G. Kuzyk; Manfred Eich; Robert A. Norwood, Editor(s)

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