Coordination properties of axially unfixed chiral dipyridine ligands towards metal and ammonium ions

Kiu Chor Sham, Chi Sing Lee, Ka Yee Chan, Shek Man Yiu, Wing Tak Wong, Hoi Lun Kwong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)


New chiral dipyridine ligands with an axially unfixed 1,1′-biphenyl bridge were prepared via homocoupling of bromophenyl pyridines. The conformeric ratios of the free ligands in solution and their coordination properties towards metal ions were studied by NMR spectroscopy. X-Ray crystallography of the silver(I) and copper(I) complexes showed 1:1 metal to ligand complexes and S planar chirality. Interestingly, the biphenyl ligands show a 1:2 stepwise binding towards most ammonium ions tested with strong fluorescence enhancement, but a selectively 1:1 binding towards l-ornithine methyl ester hydrochloride with no fluorescence enhancement.
Original languageEnglish
Pages (from-to)1149-1156
Number of pages8
Issue number6
Publication statusPublished - 13 Apr 2011
Externally publishedYes


  • Ammonium ions binding
  • Chiral ligand
  • Copper complex
  • Dipyridine ligand
  • Metal binding
  • Silver complex

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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