Aggregation-Induced Emission Enhancement in Alkoxy-Bridged Binuclear Rhenium(I) Complexes: Application as Sensor for Explosives and Interaction with Microheterogeneous Media

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• 作者：Veerasamy Sathish ; Arumugam Ramdass ; Zong-Zhan Lu ; Murugesan Velayudham ; Pounraj Thanasekaran ; Kuang-Lieh Lu ; Seenivasan Rajagopal
• 刊名：Journal of Physical Chemistry B
• 出版年：2013
• 出版时间：November 21, 2013
• 年：2013
• 卷：117
• 期：46
• 页码：14358-14366
• 全文大小：477K
• 年卷期：v.117,no.46(November 21, 2013)
• ISSN：1520-5207

文摘

The aggregation-induced emission enhancement (AIEE) characteristics of the two alkoxy-bridged binuclear Re(I) complexes [{Re(CO)₃(1,4-NVP)}₂(渭₂-OR)₂] (1, R = C₄H₉; 2, C₁₀H₂₁) bearing a long alkyl chain with 4-(1-naphthylvinyl)pyridine (1,4-NVP) ligand are illustrated. These complexes in CH₂Cl₂ (good solvent) are weakly luminescent, but their intensity increased enormously by almost 500 times by the addition of poor solvent (CH₃CN) due to aggregation. By tracking this process via UV鈥搗is absorption and emission spectral and TEM techniques, the enhanced emission is attributed to the formation of nanoaggregates. The nanoaggregate of complex 2 is used as a sensor for nitroaromatic compounds. Furthermore, the study of the photophysical properties of these binuclear Re(I) complexes in cationic, cetyltrimethylammonium bromide (CTAB), anionic, sodium dodecyl sulfate (SDS), and nonionic, p-tert-octylphenoxypolyoxyethanol (TritonX-100, TX-100), micelles as well as in CTAB鈥揾exane鈥搘ater and AOT鈥搃sooctane鈥搘ater reverse micelles using steady-state and time-resolved spectroscopy and TEM analysis reveals that the nanoaggregates became small and compact size.