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 Publications and Reviews › RGC 21 - Publication in refereed journal › 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. © 2011 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	1149-1156
Journal	Polyhedron
Volume	30
Issue number	6
DOIs	https://doi.org/10.1016/j.poly.2011.01.017
Publication status	Published - 13 Apr 2011

Research Keywords

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

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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. {\textcopyright} 2011 Elsevier Ltd. All rights reserved.",

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

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

year = "2011",

month = apr,

day = "13",

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

language = "English",

volume = "30",

pages = "1149--1156",

journal = "Polyhedron",

issn = "0277-5387",

publisher = "Elsevier Ltd.",

number = "6",

}

TY - JOUR

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. © 2011 Elsevier Ltd. All rights reserved.

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. © 2011 Elsevier Ltd. All rights reserved.

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

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-79953206568&origin=recordpage

U2 - 10.1016/j.poly.2011.01.017

DO - 10.1016/j.poly.2011.01.017

M3 - RGC 21 - Publication in refereed journal

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

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