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

Lixiong Dai; Wai-Sum Lo; Yanjuan Gu; Qingwu Xiong; Ka-Leung Wong; Wai-Ming Kwok; Wing-Tak Wong; Ga-Lai Law

doi:10.1039/c9sc00244h

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

Lixiong Dai, Wai-Sum Lo, Yanjuan Gu, Qingwu Xiong, Ka-Leung Wong, Wai-Ming Kwok, Wing-Tak Wong, Ga-Lai Law

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

23 Citations (Scopus)

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. © 2019 The Royal Society of Chemistry.

Original language	English
Pages (from-to)	4550-4559
Journal	Chemical Science
Volume	10
Issue number	17
DOIs	https://doi.org/10.1039/c9sc00244h
Publication status	Published - 28 Mar 2019
Externally published	Yes

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Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

We thank Mr Ho-Yin Wong for his help in assisting with some of the synthesis and also for rendering the graphics and designing the graphical artwork. We also thank Dr Pui-Kin So for his help in the mass spectrometry measurements. W.-T. W. gratefully acknowledges financial support from the Basic Research Program of Shenzhen (JCYJ20160531184120814). G.-L. L. gratefully acknowledges financial support from Natural Science Foundation of China (NSFC, 21875201) and financial support from Research Grants Council of Hong Kong (PolyU 153013/17P). W.-M. K. gratefully acknowledges financial support from Research Grants Council of Hong Kong (PolyU/153020/17P). All authors also gratefully acknowledge the State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University ((a) University Research Facility in Chemical and Environmental Analysis (UCEA); (b) University Research Facility in Life Sciences (ULS)).

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This full text is made available under CC-BY 3.0. https://creativecommons.org/licenses/by/3.0/

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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. {\textcopyright} 2019 The Royal Society of Chemistry.",

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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. / Dai, Lixiong; Lo, Wai-Sum; Gu, Yanjuan et al.
In: Chemical Science, Vol. 10, No. 17, 28.03.2019, p. 4550-4559.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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AU - Lo, Wai-Sum

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AU - Xiong, Qingwu

AU - Wong, Ka-Leung

AU - Kwok, Wai-Ming

AU - Wong, Wing-Tak

AU - Law, Ga-Lai

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AB - 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. © 2019 The Royal Society of Chemistry.

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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

Abstract

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