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

Research output: Journal article publication › Journal article › Academic research › 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
DOIs	https://doi.org/10.1016/j.poly.2011.01.017
Publication status	Published - 13 Apr 2011
Externally published	Yes

Keywords

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

More information

10.1016/j.poly.2011.01.017

Cite this

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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",

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year = "2011",

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doi = "10.1016/j.poly.2011.01.017",

language = "English",

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T1 - Coordination properties of axially unfixed chiral dipyridine ligands towards metal and ammonium ions

AU - Sham, Kiu Chor

AU - Lee, Chi Sing

AU - Chan, Ka Yee

AU - Yiu, Shek Man

AU - Wong, Wing Tak

AU - Kwong, Hoi Lun

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

UR - https://www.scopus.com/pages/publications/79953206568

U2 - 10.1016/j.poly.2011.01.017

DO - 10.1016/j.poly.2011.01.017

M3 - Journal article

SN - 0277-5387

VL - 30

SP - 1149

EP - 1156

JO - Polyhedron

JF - Polyhedron

IS - 6

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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