Excited State Absorption Dynamics in Metal Cluster Polymer [WS4Cu3I(4-bpy)3]n Solution

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• 作者：Junyi Yang ; Jihua Gu ; Yinglin Song ; Shi Guang ; Yuxiao Wang ; Wenhua Zhang ; Jianping Lang
• 刊名：Journal of Physical Chemistry B
• 出版年：2007
• 出版时间：July 19, 2007
• 年：2007
• 卷：111
• 期：28
• 页码：7987 - 7993
• 全文大小：183K
• 年卷期：v.111,no.28(July 19, 2007)
• ISSN：1520-5207

文摘

The nonlinear absorptive property of a novel metal cluster [WS₄Cu₃I(4-bpy)₃]_n in DMF solution is studied byusing an open-aperture Z-scan technique with picosecond and nanosecond laser pulses at the wavelength of532 nm. The experimental results show that the cluster has strong nonlinear absorption under the 8 ns pulseexcitation and a relatively weak nonlinear absorptive property under the picosecond pulse excitation. Thepicosecond pump-probe response of the metal cluster is similar to that of C₆₀ solution, which implies thatthe nonlinear mechanisms are the same for the two materials. By using the rate-equation model, the experimentaldata are theoretically simulated; several optical parameters of the cluster, especially the lifetime of the higherexcited singlet state of the cluster, are obtained.