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Synthesis, characterisation and ion-binding properties of oxathiacrown ethers appended to [Ru(bpy)2]2+. Selectivity towards Hg2+, Cd2+ and Pb2+

Odhiambo, Ruth A. LU ; Aluoch, Austin O. ; Njenga, Lydia W. ; Kagwanja, Stanley M. ; Wandiga, Shem O. and Wendt, Ola F. LU (2018) In RSC Advances 8(7). p.3663-3672
Abstract

A series of complexes with oxathiacrown ethers appended to a [Ru(bpy)2]2+ moiety have been synthesized and characterised using 1H NMR, 13C NMR, IR, electronic absorption and emission spectroscopies, mass spectrometry and elemental analyses. The complexes exhibit strong MLCT luminescence bands in the range 608-611 nm and one reversible metal centred oxidation potential in the range 1.00-1.02 V. Their selectivity and sensitivity towards Hg2+, Cd2+ and Pb2+ metal ions have been investigated using electronic absorption, luminescence, cyclic and differential pulse voltammetry titrations. Their responses towards selected cations and anions have also been investigated... (More)

A series of complexes with oxathiacrown ethers appended to a [Ru(bpy)2]2+ moiety have been synthesized and characterised using 1H NMR, 13C NMR, IR, electronic absorption and emission spectroscopies, mass spectrometry and elemental analyses. The complexes exhibit strong MLCT luminescence bands in the range 608-611 nm and one reversible metal centred oxidation potential in the range 1.00-1.02 V. Their selectivity and sensitivity towards Hg2+, Cd2+ and Pb2+ metal ions have been investigated using electronic absorption, luminescence, cyclic and differential pulse voltammetry titrations. Their responses towards selected cations and anions have also been investigated using electronic absorption and luminescence. While the complexes are selective towards Hg2+ and Cd2+ ions, none of them is selective towards Pb2+ ions. In particular, complex 2 gives a selective change in the UV/Vis absorbance with Hg2+ making it possible to detect mercury down to a detection limit of 68 ppm. The binding constants and limits of detection of the complexes have been calculated, with values ranging from 4.37 to 5.38 and 1.4 × 10-3 to 6.8 × 10-5 for log Ks and LOD respectively.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
RSC Advances
volume
8
issue
7
pages
10 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85041139405
ISSN
2046-2069
DOI
10.1039/c7ra13589k
language
English
LU publication?
yes
id
a728cfe9-9a69-4fd0-bd41-b3b5b348ab3e
date added to LUP
2019-05-03 15:00:01
date last changed
2022-03-25 18:03:56
@article{a728cfe9-9a69-4fd0-bd41-b3b5b348ab3e,
  abstract     = {{<p>A series of complexes with oxathiacrown ethers appended to a [Ru(bpy)<sub>2</sub>]<sup>2+</sup> moiety have been synthesized and characterised using <sup>1</sup>H NMR, <sup>13</sup>C NMR, IR, electronic absorption and emission spectroscopies, mass spectrometry and elemental analyses. The complexes exhibit strong MLCT luminescence bands in the range 608-611 nm and one reversible metal centred oxidation potential in the range 1.00-1.02 V. Their selectivity and sensitivity towards Hg<sup>2+</sup>, Cd<sup>2+</sup> and Pb<sup>2+</sup> metal ions have been investigated using electronic absorption, luminescence, cyclic and differential pulse voltammetry titrations. Their responses towards selected cations and anions have also been investigated using electronic absorption and luminescence. While the complexes are selective towards Hg<sup>2+</sup> and Cd<sup>2+</sup> ions, none of them is selective towards Pb<sup>2+</sup> ions. In particular, complex 2 gives a selective change in the UV/Vis absorbance with Hg<sup>2+</sup> making it possible to detect mercury down to a detection limit of 68 ppm. The binding constants and limits of detection of the complexes have been calculated, with values ranging from 4.37 to 5.38 and 1.4 × 10<sup>-3</sup> to 6.8 × 10<sup>-5</sup> for log K<sub>s</sub> and LOD respectively.</p>}},
  author       = {{Odhiambo, Ruth A. and Aluoch, Austin O. and Njenga, Lydia W. and Kagwanja, Stanley M. and Wandiga, Shem O. and Wendt, Ola F.}},
  issn         = {{2046-2069}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{7}},
  pages        = {{3663--3672}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{RSC Advances}},
  title        = {{Synthesis, characterisation and ion-binding properties of oxathiacrown ethers appended to [Ru(bpy)<sub>2</sub>]<sup>2+</sup>. Selectivity towards Hg<sup>2+</sup>, Cd<sup>2+</sup> and Pb<sup>2+</sup>}},
  url          = {{http://dx.doi.org/10.1039/c7ra13589k}},
  doi          = {{10.1039/c7ra13589k}},
  volume       = {{8}},
  year         = {{2018}},
}