Modulating the Photophysical Properties of Azamacrocyclic Europium Complexes with Charge-Transfer Antenna Chromophores
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- 作者：Adrien Bourdolle ; Mustapha Allali ; Jean-Christophe Mulatier ; Boris Le Guennic ; Jurriaan M. Zwier ; Patrice L. Baldeck ; Jean-Claude G. Bu虉nzli ; Chantal Andraud ; Laurent Lamarque ; Olivier Maury
- 刊名：Inorganic Chemistry
- 出版年：2011
- 出版时间：June 6, 2011
- 年：2011
- 卷：50
- 期：11
- 页码：4987-4999
- 全文大小：1215K
- 年卷期：v.50,no.11(June 6, 2011)
- ISSN：1520-510X
文摘
Two europium complexes with bis(bipyridine) azamacrocyclic ligands featuring pendant arms with or without 蟺-conjugated donor groups are synthesized and fully characterized by theoretical calculations and NMR spectroscopy. Their photophysical properties, including two-photon absorption, are investigated in water and in various organic solvents. The nonfunctionalized ligand gives highly water-stable europium complexes featuring bright luminescence properties but poor two-photon absorption cross sections. On the other hand, the europium complex with an extended conjugated antenna ligand presents a two-photon absorption cross section of 45 GM at 720 nm but is poorly luminescent in water. A detailed solvent-dependent photophysical study indicates that this luminescence quenching is not due to the direct coordination of O鈥揌 vibrators to the metal center but to the increase of nonradiative processes in a protic solvent induced by an internal isomerization equilibrium.