Oxido-pincer complexes of copper(II) - An EXAFS and EPR study of mono- and binuclear [(pydotH[sub]2)CuCl[sub]2][sub]n (n = 1 or 2)

Axel Klein; Katharina Butsch; Sait Elmas; Christian Biewer; Dominikus Heift; Sara Nitsche; Irene Schlipf; Helmut Bertagnolli

doi:10.1016/j.poly.2011.10.023

Oxido-pincer complexes of copper(II) - An EXAFS and EPR study of mono- and binuclear [(pydotH[sub]2)CuCl[sub]2][sub]n (n = 1 or 2)

Axel Klein, Katharina Butsch, Sait Elmas, Christian Biewer, Dominikus Heift, Sara Nitsche, Irene Schlipf, Helmut Bertagnolli

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

Abstract

The oxido-pincer ligand pydotH2 (2,6-bis(1-hydroxy-1-o-tolyl-ethyl-η2O,OÔÇ▓)pyridine) forms two different CuII containing complexes when prepared from anhydrous CuCl2. A combination of EPR spectroscopy and EXAFS allowed to structurally characterise the light-green dimer of the formula [(pydotH2)CuCl(μ-Cl)2ClCu(pydotH2)] and the penta-coordinate olive-green monomer [(pydotH2)CuCl2]. The molecular entities imply that the ligand remains protonated upon coordination. When dissolved in DMF both compounds form monomeric species [(pydotH2)CuCl2(DMF)] which could be characterised in detail by EPR, UV-Vis/NIR spectroscopy and electrochemical measurements. The assignments were supported by comparison with CuII complexes of the related ligands 2,6-bis(hydroxymethyl)pyridine (pydimH2) and 2,6-bis(1-hydroxy-1-methyl)pyridine (pydipH2).

Original language	English
Pages (from-to)	649-656
Journal	Polyhedron
Volume	31
Issue number	1
Early online date	28 Oct 2011
DOIs	https://doi.org/10.1016/j.poly.2011.10.023
Publication status	Published - 4 Jan 2012

Keywords

Chemistry

Access to Document

10.1016/j.poly.2011.10.023

https://doi.org/10.1016/j.poly.2011.10.023

Cite this

@article{79d9ef45ce344c51852e21b59b4dfcc9,

title = "Oxido-pincer complexes of copper(II) - An EXAFS and EPR study of mono- and binuclear [(pydotH[sub]2)CuCl[sub]2][sub]n (n = 1 or 2)",

abstract = "The oxido-pincer ligand pydotH2 (2,6-bis(1-hydroxy-1-o-tolyl-ethyl-η2O,O{\^O}{\c C}▓)pyridine) forms two different CuII containing complexes when prepared from anhydrous CuCl2. A combination of EPR spectroscopy and EXAFS allowed to structurally characterise the light-green dimer of the formula [(pydotH2)CuCl(μ-Cl)2ClCu(pydotH2)] and the penta-coordinate olive-green monomer [(pydotH2)CuCl2]. The molecular entities imply that the ligand remains protonated upon coordination. When dissolved in DMF both compounds form monomeric species [(pydotH2)CuCl2(DMF)] which could be characterised in detail by EPR, UV-Vis/NIR spectroscopy and electrochemical measurements. The assignments were supported by comparison with CuII complexes of the related ligands 2,6-bis(hydroxymethyl)pyridine (pydimH2) and 2,6-bis(1-hydroxy-1-methyl)pyridine (pydipH2).",

keywords = "Chemistry",

author = "Axel Klein and Katharina Butsch and Sait Elmas and Christian Biewer and Dominikus Heift and Sara Nitsche and Irene Schlipf and Helmut Bertagnolli",

year = "2012",

month = jan,

day = "4",

doi = "10.1016/j.poly.2011.10.023",

language = "English",

volume = "31",

pages = "649--656",

journal = "Polyhedron",

issn = "0277-5387",

publisher = "Elsevier Ltd",

number = "1",

}

TY - JOUR

T1 - Oxido-pincer complexes of copper(II) - An EXAFS and EPR study of mono- and binuclear [(pydotH[sub]2)CuCl[sub]2][sub]n (n = 1 or 2)

AU - Klein, Axel

AU - Butsch, Katharina

AU - Elmas, Sait

AU - Biewer, Christian

AU - Heift, Dominikus

AU - Nitsche, Sara

AU - Schlipf, Irene

AU - Bertagnolli, Helmut

PY - 2012/1/4

Y1 - 2012/1/4

N2 - The oxido-pincer ligand pydotH2 (2,6-bis(1-hydroxy-1-o-tolyl-ethyl-η2O,OÔÇ▓)pyridine) forms two different CuII containing complexes when prepared from anhydrous CuCl2. A combination of EPR spectroscopy and EXAFS allowed to structurally characterise the light-green dimer of the formula [(pydotH2)CuCl(μ-Cl)2ClCu(pydotH2)] and the penta-coordinate olive-green monomer [(pydotH2)CuCl2]. The molecular entities imply that the ligand remains protonated upon coordination. When dissolved in DMF both compounds form monomeric species [(pydotH2)CuCl2(DMF)] which could be characterised in detail by EPR, UV-Vis/NIR spectroscopy and electrochemical measurements. The assignments were supported by comparison with CuII complexes of the related ligands 2,6-bis(hydroxymethyl)pyridine (pydimH2) and 2,6-bis(1-hydroxy-1-methyl)pyridine (pydipH2).

AB - The oxido-pincer ligand pydotH2 (2,6-bis(1-hydroxy-1-o-tolyl-ethyl-η2O,OÔÇ▓)pyridine) forms two different CuII containing complexes when prepared from anhydrous CuCl2. A combination of EPR spectroscopy and EXAFS allowed to structurally characterise the light-green dimer of the formula [(pydotH2)CuCl(μ-Cl)2ClCu(pydotH2)] and the penta-coordinate olive-green monomer [(pydotH2)CuCl2]. The molecular entities imply that the ligand remains protonated upon coordination. When dissolved in DMF both compounds form monomeric species [(pydotH2)CuCl2(DMF)] which could be characterised in detail by EPR, UV-Vis/NIR spectroscopy and electrochemical measurements. The assignments were supported by comparison with CuII complexes of the related ligands 2,6-bis(hydroxymethyl)pyridine (pydimH2) and 2,6-bis(1-hydroxy-1-methyl)pyridine (pydipH2).

KW - Chemistry

U2 - 10.1016/j.poly.2011.10.023

DO - 10.1016/j.poly.2011.10.023

M3 - Article

SN - 0277-5387

VL - 31

SP - 649

EP - 656

JO - Polyhedron

JF - Polyhedron

IS - 1

ER -

Oxido-pincer complexes of copper(II) - An EXAFS and EPR study of mono- and binuclear [(pydotH[sub]2)CuCl[sub]2][sub]n (n = 1 or 2)

Abstract

Keywords

Access to Document

Fingerprint

Cite this