The first observation of emission of electronically-excited states of the divalent Eu^2+? ion in the new chemiluminescent system EuCl₃¡¤6H₂O-Buⁱ₂AlH-O₂ and the energy transfer f

详细信息    查看全文

• 作者：Ramil G. Bulgakov ; ^{profbulgakov@yandex.ru} ; Svetlana M. Eliseeva ; Dim I. Galimov
• 关键词：Divalent Eu2+ ion ; Chemiluminescence ; Photoluminescence ; Eu2+? chemiluminescent emitter and energy donor ; Bui2AlH chemiluminescent oxidation
• 刊名：Journal of Luminescence
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：136
• 期：Complete
• 页码：95-99
• 全文大小：480 K

文摘

We have discovered a new bright blue chemiluminescence (CL) in the title system, visible to the naked eye, caused by broadband fd emission of electronically-excited divalent europium ion, Eu^2+? (¦Ë_max=465 nm). This is the first example in which a divalent lanthanide ion acts as a emitter and enhancer of liquid-phase CL. The CL was produced by adding the diisobutylaluminum hydride Buⁱ₂AlH to a suspension of EuCl₃¡¤6H₂O crystalline hydrate in THF. Buⁱ₂AlH removes water molecules from the coordination sphere of Eu³⁺, and reduces Eu³⁺ to Eu²⁺. As a result, aluminoxane, isobutane, hydrogen and the complex EuCl₂¡¤(THF)_x, where x¡Ö2, are formed. And simultaneously excess of Buⁱ₂AlH is oxidized by oxygen traces generating a primary emitter, triplet-excited molecule, isobutyric aldehyde. The energy of the latter is transferred to the europium complex, EuCl₂¡¤(THF)_x (x¡Ö2), which emits blue light. The divalent Eu²⁺ ion is a much more efficient enhancer of CL in oxidation of Buⁱ₂AlH than the trivalent lanthanide ion Tb³⁺.