Syntheses, characterization and optical limiting properties of heterometallic cluster-containing polymers

Nigel T. Lucas*, Eleni G. Notaras, Mark G. Humphrey, Marek Samoc, Barry Luther-Davies

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


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 β 2 than the [MoIr3] cores; the tungsten example, W 2Ir2(CO)10(η-C5H 5)5, 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-C5H 4Me)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].

Original languageEnglish
Pages (from-to)318-325
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2003
EventLinear and Nonlinear Optics of Organic Materials III - San Diego, CA, United States
Duration: 4 Aug 20036 Aug 2003


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