@article{a7711e8f653e472d9b2b124499ebf618,
title = "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 = "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.",
author = "Lixiong Dai and Lo, {Wai Sum} and Yanjuan Gu and Qingwu Xiong and Ka-Leung WONG and Kwok, {Wai Ming} and Wong, {Wing Tak} and Law, {Ga Lai}",
note = "Funding Information: 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 nancial support from the Basic Research Program of Shenzhen (JCYJ20160531184120814). G.-L. L. gratefully acknowledges nancial support from Natural Science Foundation of China (NSFC, 21875201) and nancial support from Research Grants Council of Hong Kong (PolyU 153013/17P). W.-M. K. gratefully acknowledges nancial 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)).",
year = "2019",
month = may,
day = "7",
doi = "10.1039/c9sc00244h",
language = "English",
volume = "10",
pages = "4550--4559",
journal = "Chemical Science",
issn = "2041-6520",
publisher = "Royal Society of Chemistry",
number = "17",
}