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 article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)4550-4559
Number of pages10
JournalChemical Science
Issue number17
Publication statusPublished - 1 Jan 2019

ASJC Scopus subject areas

  • Chemistry(all)

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