Chelating (pyrazolylmethyl)pyridine ligands: Coordination chemistry and binding properties with zinc(II) and cadmium(II) cations

Stephen O. Ojwach; George S. Nyamato; Benard Omondi; James Darkwa

doi:10.1016/j.ica.2012.07.005

Chelating (pyrazolylmethyl)pyridine ligands: Coordination chemistry and binding properties with zinc(II) and cadmium(II) cations

Stephen O. Ojwach, George S. Nyamato, Benard Omondi, James Darkwa

Chemical Sciences

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

Reactions of 2-(3,5-dimethylpyrazol-1-ylmethyl)pyridine (L2) and 2-(3,5-ditertbutylpyrazol-1-ylmethyl)pyridine (L3) with either Zn(NO ₃) or Cd(NO₃) produced monometallic complexes [Zn(NO ₃)₂(L2)] (1), [Zn(NO₃)₂(L3)] (2), [Cd(NO₃)₂(L2)] (3) and [Cd(NO₃) ₂(L3)] (4). In the solid state structures of complexes 1, 3 and 4, L2 and L3 ligate to the zinc and cadmium atoms in a bidentate fashion. The pyrazolyl compounds 2-(pyrazol-1-ylmethyl)pyridine (L1), (L2) and (L3) were also used as model chelating agents for liquid-liquid removal of zinc(II), cadmium(II) and lead(II) cations from water using dichloromethane as the organic solvent. L1-L3 showed extraction efficiencies of 70-88% for zinc(II), 50-55% for lead(II) and (19-31%) for cadmium(II). Theoretical results obtained from density functional theory calculations were consistent with the experimental extraction trends.

Original language	English
Pages (from-to)	141-147
Number of pages	7
Journal	Inorganica Chimica Acta
Volume	392
DOIs	https://doi.org/10.1016/j.ica.2012.07.005
Publication status	Published - 30 Sept 2012

Keywords

Cadmium(II)
Liquid-liquid extractions
Pyrazolyl ligands
X-ray structures
Zinc(II)

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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title = "Chelating (pyrazolylmethyl)pyridine ligands: Coordination chemistry and binding properties with zinc(II) and cadmium(II) cations",

abstract = "Reactions of 2-(3,5-dimethylpyrazol-1-ylmethyl)pyridine (L2) and 2-(3,5-ditertbutylpyrazol-1-ylmethyl)pyridine (L3) with either Zn(NO 3) or Cd(NO3) produced monometallic complexes [Zn(NO 3)2(L2)] (1), [Zn(NO3)2(L3)] (2), [Cd(NO3)2(L2)] (3) and [Cd(NO3) 2(L3)] (4). In the solid state structures of complexes 1, 3 and 4, L2 and L3 ligate to the zinc and cadmium atoms in a bidentate fashion. The pyrazolyl compounds 2-(pyrazol-1-ylmethyl)pyridine (L1), (L2) and (L3) were also used as model chelating agents for liquid-liquid removal of zinc(II), cadmium(II) and lead(II) cations from water using dichloromethane as the organic solvent. L1-L3 showed extraction efficiencies of 70-88% for zinc(II), 50-55% for lead(II) and (19-31%) for cadmium(II). Theoretical results obtained from density functional theory calculations were consistent with the experimental extraction trends.",

keywords = "Cadmium(II), Liquid-liquid extractions, Pyrazolyl ligands, X-ray structures, Zinc(II)",

author = "Ojwach, {Stephen O.} and Nyamato, {George S.} and Benard Omondi and James Darkwa",

year = "2012",

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doi = "10.1016/j.ica.2012.07.005",

language = "English",

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journal = "Inorganica Chimica Acta",

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T1 - Chelating (pyrazolylmethyl)pyridine ligands

T2 - Coordination chemistry and binding properties with zinc(II) and cadmium(II) cations

AU - Ojwach, Stephen O.

AU - Nyamato, George S.

AU - Omondi, Benard

AU - Darkwa, James

PY - 2012/9/30

Y1 - 2012/9/30

N2 - Reactions of 2-(3,5-dimethylpyrazol-1-ylmethyl)pyridine (L2) and 2-(3,5-ditertbutylpyrazol-1-ylmethyl)pyridine (L3) with either Zn(NO 3) or Cd(NO3) produced monometallic complexes [Zn(NO 3)2(L2)] (1), [Zn(NO3)2(L3)] (2), [Cd(NO3)2(L2)] (3) and [Cd(NO3) 2(L3)] (4). In the solid state structures of complexes 1, 3 and 4, L2 and L3 ligate to the zinc and cadmium atoms in a bidentate fashion. The pyrazolyl compounds 2-(pyrazol-1-ylmethyl)pyridine (L1), (L2) and (L3) were also used as model chelating agents for liquid-liquid removal of zinc(II), cadmium(II) and lead(II) cations from water using dichloromethane as the organic solvent. L1-L3 showed extraction efficiencies of 70-88% for zinc(II), 50-55% for lead(II) and (19-31%) for cadmium(II). Theoretical results obtained from density functional theory calculations were consistent with the experimental extraction trends.

AB - Reactions of 2-(3,5-dimethylpyrazol-1-ylmethyl)pyridine (L2) and 2-(3,5-ditertbutylpyrazol-1-ylmethyl)pyridine (L3) with either Zn(NO 3) or Cd(NO3) produced monometallic complexes [Zn(NO 3)2(L2)] (1), [Zn(NO3)2(L3)] (2), [Cd(NO3)2(L2)] (3) and [Cd(NO3) 2(L3)] (4). In the solid state structures of complexes 1, 3 and 4, L2 and L3 ligate to the zinc and cadmium atoms in a bidentate fashion. The pyrazolyl compounds 2-(pyrazol-1-ylmethyl)pyridine (L1), (L2) and (L3) were also used as model chelating agents for liquid-liquid removal of zinc(II), cadmium(II) and lead(II) cations from water using dichloromethane as the organic solvent. L1-L3 showed extraction efficiencies of 70-88% for zinc(II), 50-55% for lead(II) and (19-31%) for cadmium(II). Theoretical results obtained from density functional theory calculations were consistent with the experimental extraction trends.

KW - Cadmium(II)

KW - Liquid-liquid extractions

KW - Pyrazolyl ligands

KW - X-ray structures

KW - Zinc(II)

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U2 - 10.1016/j.ica.2012.07.005

DO - 10.1016/j.ica.2012.07.005

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VL - 392

SP - 141

EP - 147

JO - Inorganica Chimica Acta

JF - Inorganica Chimica Acta

ER -

Chelating (pyrazolylmethyl)pyridine ligands: Coordination chemistry and binding properties with zinc(II) and cadmium(II) cations

Abstract

Keywords

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