Use of Luminescence Probing for the Study of the Interaction of Polytitanasiloxane with Trivalent Rare Earth Ions

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• 作者：Ling Zhang ; Yingzheng Yao ; Xiufang Ye ; Qing Wu
• 刊名：Journal of Physical Chemistry B
• 出版年：2007
• 出版时间：January 18, 2007
• 年：2007
• 卷：111
• 期：2
• 页码：335 - 339
• 全文大小：56K
• 年卷期：v.111,no.2(January 18, 2007)
• ISSN：1520-5207

文摘

Luminescent probing methods were employed to investigate the interaction of the Ti-O chains ofpolytitanasiloxane with europium ions in the mixture of ethanol and water. The UV-vis absorption, theluminescence intensity, and the luminescence lifetimes of the Eu³⁺ ions in PTS solutions were all found toincrease with the increase of TBT/TEOS molar ratio. The results indicated that the incorporation of TBT canresult in the increase of absorption energy of the Ti-O group by near-UV excitation and in the increase ofenergy transfer to the metal ion, and that the Ti-O chains due to the site binding of Eu³⁺ ions can expel sixto nine solvent molecules from the first coordination solvation shell of the ion. The investigation of theenergy transfer from europium to neodymium ions in polytitanasiloxane solutions revealed the formation ofaggregates consisting of seven rare earth ions (together with the polytitanasiloxane countercharges).