Halide-modulated bistate and tristate fluorescence switching for Cu(i) and Ag(i) complexes

Chang Chuan Chou*, Hsuch-Ju Liu, Lucas Hung Chieh Chao, Chia Chi Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The reaction of a fluorescent trans-chelating ligand LPh (where LPh = 1,3-bis-(3,5-dimethyl-pyrazol-1-ylmethyl)-2-phenyl-2,3-dihydro-1H-perimidine, QY = 9.7%) with MClO4 (M = Cu, Ag) can lead to two-coordinate complexes [M(LPh)](ClO4) (M = Cu (1·ClO4) and Ag (5·ClO4)). When LPh is treated with CuX (X = Cl, Br or I), however, this may lead either to a two-coordinate linear complex [Cu(LPh)](CuCl2) (4·CuCl2) or to three-coordinate T-shaped complexes [Cu(LPh)X] (X = Br (2), I (3)). Moreover, while complex 1·ClO4 shows a ligand substitution for Cl- to form 4·CuCl2, it displays anion coordination for both Br- and I- to give 2 and 3, respectively. All of the copper(i) derivatives can readily liberate ligand LPh upon reacting with F-. As such, a cyclic tristate molecular switching system "LPh 虠 1·ClO4 虠 2 or 3 虠 LPh" can be accomplished. For complex 5·ClO4, the addition of halides X- (X = Cl, Br, I) results in the abstraction of the silver ions and release of the ligand LPh. A simple "LPh 虠 5·ClO4" bistate molecular interconversion may also be constructed. Above all, the complexation of either MClO4 or CuX with LPh can be signalled through different quenching effects, QY = 0.5% for 1·ClO4, 3.1% for 2, 3.2% for 3, 0.8% for 4·CuCl2, and 0.3% for 5·ClO4, to realize facile bistate and tristate fluorescence switching operations.

Original languageEnglish
Pages (from-to)1260-1266
Number of pages7
JournalNew Journal of Chemistry
Issue number2
StatePublished - 1 Feb 2015

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