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

doi:10.1016/j.poly.2011.01.017

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^*

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

11 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	1149-1156
Number of pages	8
Journal	Polyhedron
Volume	30
Issue number	6
Early online date	3 Feb 2011
DOIs	https://doi.org/10.1016/j.poly.2011.01.017
Publication status	Published - 13 Apr 2011

User-Defined Keywords

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

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.poly.2011.01.017

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title = "Coordination properties of axially unfixed chiral dipyridine ligands towards metal and ammonium ions",

abstract = "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.",

keywords = "Ammonium ions binding, Chiral ligand, Copper complex, Dipyridine ligand, Metal binding, Silver complex",

author = "Sham, {Kiu Chor} and Lee, {Chi Sing} and Chan, {Ka Yee} and Yiu, {Shek Man} and Wong, {Wing Tak} and Kwong, {Hoi Lun}",

note = "The work described in this paper was supported by a grant from the University Grants Committee of the Hong Kong Special Administrative Region, China (Project No. [AoE/P-03/08]) and the City University of Hong Kong (Project No.7002607). Publisher Copyright: {\textcopyright} 2011 Elsevier Ltd. All rights reserved.",

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AU - Sham, Kiu Chor

AU - Lee, Chi Sing

AU - Chan, Ka Yee

AU - Yiu, Shek Man

AU - Wong, Wing Tak

AU - Kwong, Hoi Lun

N1 - The work described in this paper was supported by a grant from the University Grants Committee of the Hong Kong Special Administrative Region, China (Project No. [AoE/P-03/08]) and the City University of Hong Kong (Project No.7002607). Publisher Copyright: © 2011 Elsevier Ltd. All rights reserved.

PY - 2011/4/13

Y1 - 2011/4/13

N2 - 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.

AB - 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.

KW - Ammonium ions binding

KW - Chiral ligand

KW - Copper complex

KW - Dipyridine ligand

KW - Metal binding

KW - Silver complex

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DO - 10.1016/j.poly.2011.01.017

M3 - Journal article

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SN - 0277-5387

VL - 30

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EP - 1156

JO - Polyhedron

JF - Polyhedron

IS - 6

ER -

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

Abstract

User-Defined Keywords

UN SDGs

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