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Breaking the 1,2-HOPO barrier with a cyclen backbone for more efficient sensitization of Eu(III) luminescence and unprecedented two-photon excitation properties

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Abstract

A cyclen backbone was utilized to study the effect of backbone rigidity on Eu(III) luminescence sensitization using a 1,2-HOPO derivative and 2-thenoyltrifluoroacetonate (TTA) as chromophores. The restriction of molecular movement of Eu-Cy-HOPO brought about by the increased rigidity provided a tightly packed coordination environment for the octadentate Eu(III) center which resulted in the highest overall quantum yield (30.2%) and sensitization efficiency (64.6%) among 1,2-HOPO sensitized Eu(III) complexes. Eu-Cy-HOPO is also the first 1,2-HOPO-based lanthanide complex to emit Eu(III) luminescence under two-photon excitation.

Graphical abstract: Breaking the 1,2-HOPO barrier with a cyclen backbone for more efficient sensitization of Eu(iii) luminescence and unprecedented two-photon excitation properties

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Publication details

The article was received on 16 Jan 2019, accepted on 27 Mar 2019 and first published on 28 Mar 2019


Article type: Edge Article
DOI: 10.1039/C9SC00244H
Citation: Chem. Sci., 2019, Advance Article
  • Open access: Creative Commons BY license
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    Breaking the 1,2-HOPO barrier with a cyclen backbone for more efficient sensitization of Eu(III) luminescence and unprecedented two-photon excitation properties

    L. Dai, W. Lo, Y. Gu, Q. Xiong, K. Wong, W. Kwok, W. Wong and G. Law, Chem. Sci., 2019, Advance Article , DOI: 10.1039/C9SC00244H

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