Sensitized near-infrared luminescence of lanthanide complexes by energy transfer from a ruthenium antenna

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• 作者：Subramanian Singaravadivel ; Eththilu Babu ; Murugesan Velayudham ; Kuang-Lieh Lu ; Seenivasan Rajagopal
• 关键词：Lanthanides ; Ruthenium ; Tpphz ; Energy transfer ; NIR luminescence
• 刊名：Polyhedron
• 出版年：2013
• 出版时间：29 August, 2013
• 年：2013
• 卷：60
• 期：Complete
• 页码：54-58
• 全文大小：1065 K

文摘

The luminescent ruthenium tetrapyrido [3, 2-a:2¡ä, 3¡å-c:3¡å, 2¡å-h:2?, 3?-j] phenazine(tpphz) complex acts as a potential bridging ligand with a vacant diimine site, and is used as ¡®metallo ligand¡¯ to make heterodinuclear d-f complexes by attachment of a {Ln(dik)₃} fragment (dik = tta (trifluoro theonyl acetone)) at the vacant site. When Ln = Nd, Yb or Er, the lanthanide centre has low-energy f-f excited states capable of accepting energy from the ³MLCT excited state of the Ru(II) centre. Luminescence quenching of the ³MLCT Ru(II) center affords sensitized Ln(III) based luminescence in the near-IR region. Nd(III) is found to be the most effective quencher for the ³MLCT luminescence of the ruthenium component because of the high density of f-f excited states of the appropriate energy, which makes it a more efficient energy-acceptor compared to the Er and Yb complexes.