Photo-luminescent hetero-trinuclear Zn₂Ln (Ln = Nd, Yb, Er or Gd) complexes based on the binuclear Zn₂L precursor

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• 作者：Yao Zhang ; Weixu Feng ; Han Liu ; Zhao Zhang ; Xingqiang L¨¹ ; Jirong Song ; Daidi Fan ; Wai-Kwok Wong ; Richard A. Jones
• 关键词：NIR luminescence ; Binuclear Zn2 ; Hetero-trinuclear Zn2Ln complexes ; Schiff-base
• 刊名：Inorganic Chemistry Communications
• 出版年：2012
• 出版时间：October, 2012
• 年：2012
• 卷：24
• 期：Complete
• 页码：148-152
• 全文大小：511 K

文摘

With the binuclear Zn₂L ([Zn₂L(OAc)₂(H₂O)], 1) compound from the Salen-type Schiff-base ligand H₂L (H₂L: N,N¡ä-bis(salicylidene)cyclohexane-1,2-diamine) with the flexible linker as the precursor, a series of hetero-trinuclear Zn₂Ln complexes (Ln = Nd (2), Ln = Yb (3), Ln = Er (4) or Ln = Gd (5)) have been obtained by further reaction with Ln(OAc)₃¡¤6H₂O. The result of their photophysical properties shows that the strong and characteristic NIR luminescence with emissive lifetimes in the ranges of microseconds for each of the complexes 2-4, has been sensitized from the excited state (¹LC and ³LC) of the Salen-type Schiff-base ligand with the flexible linker. Especially, the almost planar arrangement of two energy donors of ZnL components around the Ln^3 + ion for the larger conjugation effect, endowing the energy level's good match between the excited state (³LC) of the chromophore to the corresponding Ln^3 + ion's exciting state, results in the enhancement of their NIR luminescence.