Journal
POLYHEDRON
Volume 30, Issue 6, Pages 1149-1156Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2011.01.017
Keywords
Chiral ligand; Dipyridine ligand; Metal binding; Ammonium ions binding; Copper complex; Silver complex
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Funding
- University Grants Committee of the Hong Kong Special Administrative Region, China [AoE/P-03/08]
- City University of Hong Kong [7002607]
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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. (C) 2011 Elsevier Ltd. All rights reserved.
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