Dipyrrolylquinoxaline-bridged Schiff bases: A new class of fluorescent sensors for mercury(II)

Lei Wang, Xunjin ZHU, Wai Yeung WONG, Jian Ping Guo, Rick W K WONG*, Zao Ying Li

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

58 Citations (Scopus)


Novel 2,3-bis(1H-pyrrol-2-yl)quinoxaline-functionalized Schiff bases were prepared and characterized as new fluorescent sensors for mercury(II) ion. The X-ray crystal structures of compounds 4, 5, 4a and 5a were determined. The binding properties of 4 and 5 for cations were examined by UV-vis and fluorescence spectroscopy. The UV-vis and fluorescence data indicate that a 1: 1 stoichiometric complex is formed between compound 4 (or 5) and mercury(II) ion, and the association constant is (3.81 ± 0.7) × 105 M-1 for 4 and (3.43 ± 0.53) × 105 M -1 for 5. The recognition mechanism between compound 4 (or 5) and metal ion was discussed based on their chemical construction and the fluorescence quenching effect when they interact with each other. Competition experiments revealed that compound 4 (or 5) has a highly selective response to mercury(II) ion in aqueous solution.

Original languageEnglish
Pages (from-to)3235-3240
Number of pages6
JournalDalton Transactions
Issue number19
Publication statusPublished - 7 Oct 2005

Scopus Subject Areas

  • Inorganic Chemistry


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