Synthesis, structure and magnetic properties of trinuclear transition metal complexes based on pyridine-2-amidoxime

Guang Yu An; Bin Yuan; Jun Tao; Ai Li Cui; Hui Zhong Kou

doi:10.1016/j.ica.2012.02.036

Synthesis, structure and magnetic properties of trinuclear transition metal complexes based on pyridine-2-amidoxime

Guang Yu An, Bin Yuan, Jun Tao, Ai Li Cui, Hui Zhong Kou^*

^*Corresponding author for this work

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

12 Citations (Scopus)

Abstract

Four oximato-bridged trinuclear complexes [Ni ^II ₂(Hpyaox) ₆Mn ^IV]Cl·ClO ₄·6H ₂O (1), [Ni ^II ₂(Hpyaox) ₆Mn ^IV](ClO ₄) ₂·2DMF· 4H ₂O (2), [Ni ^II ₂(Hpyaox) ₆Cr ^III]ClO ₄·6H ₂O (3) and [Ni ^II ₂(Hpyaox) ₆Fe ^III]ClO ₄·6H ₂O (4) based on pyridine-2-amidoxime (H ₂pyaox) were prepared in water-DMF solution. X-ray diffraction analysis reveals that they are isomorphous, and consist of linear triply oximato-bridged Ni ^II ₂Mn ^IV (1 and 2), Ni ^II ₂Cr ^III (3) and Ni ^II ₂Fe ^III (4) cations with Mn ^IV, Cr ^III and Fe ^III ions at the centre. The Ni(II) ion is coordinated by three mono-deprotonated Hpyaox ^- anions, giving a [Ni(Hpyaox) ₃] ^- anion. Two [Ni(Hpyaox) ₃] ^- anions coordinate to the central M(III/IV) ion with six oximato oxygen atoms, yielding the trinuclear unit. The magnetic susceptibility measurements show that complexes 1-4 exhibit antiferromagnetic interaction between adjacent metal ions through the triple oximato bridges. By comparison, the unusual antiferromagnetic property of complexes 1-3 has been found to be related to the distortion of the NiN ₆ coordination configuration from octahedral to trigonal. The magnetic data were fitted by considering the magnetic coupling between adjacent ions, two terminal ions and nearest molecules, respectively.

Original language	English
Pages (from-to)	401-406
Number of pages	6
Journal	Inorganica Chimica Acta
Volume	387
DOIs	https://doi.org/10.1016/j.ica.2012.02.036
Publication status	Published - 30 May 2012
Externally published	Yes

Keywords

Crystal structure
Magnetic properties
Oximato bridges
Polynuclear complexes
Transition metal

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10.1016/j.ica.2012.02.036

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@article{fc30b0e4879749d69f0b6f5265215047,

title = "Synthesis, structure and magnetic properties of trinuclear transition metal complexes based on pyridine-2-amidoxime",

abstract = "Four oximato-bridged trinuclear complexes [Ni II 2(Hpyaox) 6Mn IV]Cl·ClO 4·6H 2O (1), [Ni II 2(Hpyaox) 6Mn IV](ClO 4) 2·2DMF· 4H 2O (2), [Ni II 2(Hpyaox) 6Cr III]ClO 4·6H 2O (3) and [Ni II 2(Hpyaox) 6Fe III]ClO 4·6H 2O (4) based on pyridine-2-amidoxime (H 2pyaox) were prepared in water-DMF solution. X-ray diffraction analysis reveals that they are isomorphous, and consist of linear triply oximato-bridged Ni II 2Mn IV (1 and 2), Ni II 2Cr III (3) and Ni II 2Fe III (4) cations with Mn IV, Cr III and Fe III ions at the centre. The Ni(II) ion is coordinated by three mono-deprotonated Hpyaox - anions, giving a [Ni(Hpyaox) 3] - anion. Two [Ni(Hpyaox) 3] - anions coordinate to the central M(III/IV) ion with six oximato oxygen atoms, yielding the trinuclear unit. The magnetic susceptibility measurements show that complexes 1-4 exhibit antiferromagnetic interaction between adjacent metal ions through the triple oximato bridges. By comparison, the unusual antiferromagnetic property of complexes 1-3 has been found to be related to the distortion of the NiN 6 coordination configuration from octahedral to trigonal. The magnetic data were fitted by considering the magnetic coupling between adjacent ions, two terminal ions and nearest molecules, respectively.",

keywords = "Crystal structure, Magnetic properties, Oximato bridges, Polynuclear complexes, Transition metal",

author = "An, {Guang Yu} and Bin Yuan and Jun Tao and Cui, {Ai Li} and Kou, {Hui Zhong}",

year = "2012",

month = may,

day = "30",

doi = "10.1016/j.ica.2012.02.036",

language = "English",

volume = "387",

pages = "401--406",

journal = "Inorganica Chimica Acta",

issn = "0020-1693",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Synthesis, structure and magnetic properties of trinuclear transition metal complexes based on pyridine-2-amidoxime

AU - An, Guang Yu

AU - Yuan, Bin

AU - Tao, Jun

AU - Cui, Ai Li

AU - Kou, Hui Zhong

PY - 2012/5/30

Y1 - 2012/5/30

N2 - Four oximato-bridged trinuclear complexes [Ni II 2(Hpyaox) 6Mn IV]Cl·ClO 4·6H 2O (1), [Ni II 2(Hpyaox) 6Mn IV](ClO 4) 2·2DMF· 4H 2O (2), [Ni II 2(Hpyaox) 6Cr III]ClO 4·6H 2O (3) and [Ni II 2(Hpyaox) 6Fe III]ClO 4·6H 2O (4) based on pyridine-2-amidoxime (H 2pyaox) were prepared in water-DMF solution. X-ray diffraction analysis reveals that they are isomorphous, and consist of linear triply oximato-bridged Ni II 2Mn IV (1 and 2), Ni II 2Cr III (3) and Ni II 2Fe III (4) cations with Mn IV, Cr III and Fe III ions at the centre. The Ni(II) ion is coordinated by three mono-deprotonated Hpyaox - anions, giving a [Ni(Hpyaox) 3] - anion. Two [Ni(Hpyaox) 3] - anions coordinate to the central M(III/IV) ion with six oximato oxygen atoms, yielding the trinuclear unit. The magnetic susceptibility measurements show that complexes 1-4 exhibit antiferromagnetic interaction between adjacent metal ions through the triple oximato bridges. By comparison, the unusual antiferromagnetic property of complexes 1-3 has been found to be related to the distortion of the NiN 6 coordination configuration from octahedral to trigonal. The magnetic data were fitted by considering the magnetic coupling between adjacent ions, two terminal ions and nearest molecules, respectively.

AB - Four oximato-bridged trinuclear complexes [Ni II 2(Hpyaox) 6Mn IV]Cl·ClO 4·6H 2O (1), [Ni II 2(Hpyaox) 6Mn IV](ClO 4) 2·2DMF· 4H 2O (2), [Ni II 2(Hpyaox) 6Cr III]ClO 4·6H 2O (3) and [Ni II 2(Hpyaox) 6Fe III]ClO 4·6H 2O (4) based on pyridine-2-amidoxime (H 2pyaox) were prepared in water-DMF solution. X-ray diffraction analysis reveals that they are isomorphous, and consist of linear triply oximato-bridged Ni II 2Mn IV (1 and 2), Ni II 2Cr III (3) and Ni II 2Fe III (4) cations with Mn IV, Cr III and Fe III ions at the centre. The Ni(II) ion is coordinated by three mono-deprotonated Hpyaox - anions, giving a [Ni(Hpyaox) 3] - anion. Two [Ni(Hpyaox) 3] - anions coordinate to the central M(III/IV) ion with six oximato oxygen atoms, yielding the trinuclear unit. The magnetic susceptibility measurements show that complexes 1-4 exhibit antiferromagnetic interaction between adjacent metal ions through the triple oximato bridges. By comparison, the unusual antiferromagnetic property of complexes 1-3 has been found to be related to the distortion of the NiN 6 coordination configuration from octahedral to trigonal. The magnetic data were fitted by considering the magnetic coupling between adjacent ions, two terminal ions and nearest molecules, respectively.

KW - Crystal structure

KW - Magnetic properties

KW - Oximato bridges

KW - Polynuclear complexes

KW - Transition metal

UR - http://www.scopus.com/inward/record.url?scp=84860296077&partnerID=8YFLogxK

U2 - 10.1016/j.ica.2012.02.036

DO - 10.1016/j.ica.2012.02.036

M3 - Article

AN - SCOPUS:84860296077

SN - 0020-1693

VL - 387

SP - 401

EP - 406

JO - Inorganica Chimica Acta

JF - Inorganica Chimica Acta

ER -

Synthesis, structure and magnetic properties of trinuclear transition metal complexes based on pyridine-2-amidoxime

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Keywords

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