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首页> 外文会议>Conference on Linear and Nonlinear Optics of Organic Materials III; Aug 4-6, 2003; San Diego, California, USA >Syntheses, characterization and optical limiting properties of heterometallic cluster-containing polymers
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Syntheses, characterization and optical limiting properties of heterometallic cluster-containing polymers

机译：含杂金属团簇的聚合物的合成，表征和光学极限性质

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摘要

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_2Ir_2] cluster cores (M = Mo, W) displayed a greater effective nonlinear absorption coefficent β_2 than the [MoIr_3] cores; the tungsten example, W_2Ir_2(CO)_(10)(η-C_5H_5)_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 Mo_2Ir_2(μ4-η~2-MeC_2Ph)(CO)_8(η-C_5H_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].
机译：合成了在四面体或蝴蝶形四原子簇核中结合了第6组（钼，钨）和铱原子的过渡金属羰基簇，以及羰基，环戊二烯基和炔烃配体，并将其掺入低聚乙烷中，并限制了它们的光学极限性能通过开孔Z扫描（ns脉冲，523 nm）和时间分辨泵浦探针研究（ps脉冲，527 nm）进行评估。 Z扫描研究表明，四面体[M_2Ir_2]团簇核（M = Mo，W）表现出比[MoIr_3]核更大的有效非线性吸收系数β_2。以钨为例，W_2Ir_2（CO）_（10）（η-C_5H_5）_2表现出最高的响应。在环戊二烯基上的取代（包括并入聚合物主链）对测得的响应影响很小。使用皮秒脉冲在527 nm处对炔烃加合物Mo_2Ir_2（μ4-η〜2-MeC_2Ph）（CO）_8（η-C_5H_4Me）_2进行时间分辨的研究，揭示了电子过程产生的光功率限制行为[具体而言，是一种快速的非线性吸收过程，然后是涉及长寿命（> 1000 ps）亚稳态激发态的反向饱和吸收]。

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