A New Approach for the Detection of Ethylene Using Silica-Supported Palladium Complexes

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• 作者：Patricia Cabanillas-Galá ; n ; Linda Farmer ; Terence Hagan ; Mark Nieuwenhuyzen ; Stuart L. James ; M. Cristina Lagunas
• 刊名：Inorganic Chemistry
• 出版年：2008
• 出版时间：October 6, 2008
• 年：2008
• 卷：47
• 期：19
• 页码：9035-9041
• 全文大小：244K
• 年卷期：v.47,no.19(October 6, 2008)
• ISSN：1520-510X

文摘

The coordination of olefins to square-planar Pd(II) and Pt(II) complexes containing 2,9-dimethylphenanthroline (L1) often involves a change of color associated with a change of geometry at the metal center. In order to obtain suitable colorimetric detectors for ethylene gas, a series of new Pd(II) and Pt(II) compounds with a range of 2,9-disubstituted phenanthroline ligands [2,9-di-n-butyl-1,10-phenanthroline (L2), 2,9-di-s-butyl-1,10-phenanthroline (L3), 2,9-diphenyl-1,10-phenanthroline (L4), and 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (bathocuproine, L5)] have been prepared and their reactivity toward ethylene investigated both in solution and after depositing the detector compounds on a variety of solid supports. The Pd(II) complex [PdCl₂(L2)] supported on silica undergoes a clear color change upon exposure to ethylene, while remaining stable toward air and water, and forms the basis for new simple colorimetric detectors with potential applications in ethylene pipe-leak detection and the monitoring of fruit ripening. Encouragingly, the detector is able to discriminate between fruit at different stages of ripening. The response of the detector to other volatiles was also examined, and specific color changes were also observed upon exposure to aromatic acetylenes. The crystal structures of four new derivatives, including the ethylene−Pt(II) complex [PtCl₂(C₂H₄)(L2)], are also described.