Synthesis, structure and magnetic properties of trinuclear transition metal complexes based on pyridine-2-amidoxime
Synthesis, structure and magnetic properties of trinuclear transition metal complexes based on pyridine-2-amidoxime
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吡啶-2-偕胺肟三核过渡金属配合物的合成、结构及磁性能
DOI：
10.1016/j.ica.2012.02.036
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发表时间：
2012-05
影响因子：
2.8
通讯作者：
Kou, Hui-Zhong
中科院分区：
文献类型：
--
作者：
Yuan, Bin;Tao, Jun;Cui, Ai-Li;Kou, Hui-Zhong
以吡啶-2-偕胺肟（H2pyaox）为基础，在水- dmf溶液中制备了4种肟桥接的三核配合物[NiII2(Hpyaox)6MnIV]Cl·ClO4·6H2O(1)、[NiII2(Hpyaox)6MnIV](ClO4)2·2DMF·4H2O(2)、[NiII2(Hpyaox)6CrIII]ClO4·6H2O(3)和[NiII2(Hpyaox)6FeIII]ClO4·6H2O(4)。x射线衍射分析表明，它们是同构的，由线性三氧桥接NiII2MnIV(1和2),NiII2CrIII(3)和NiII2FeIII(4)阳离子组成，MnIV， criiii和FeIIIions位于中心。Ni（II）离子由三个单去质子化的Hpyaox -阴离子配位，得到[Ni(Hpyaox)3] -阴离子。两个[Ni(Hpyaox)3]−阴离子与中心的M（III/IV）离子配位，有6个氧原子，形成三核单元。磁化率测量表明，配合物1 ~ 4通过三氧桥在相邻金属离子之间表现出反铁磁相互作用。通过比较，发现配合物1-3的异常反铁磁性质与nin6配位构型从八面体畸变为三角形有关。分别考虑相邻离子、两个末端离子和最近分子之间的磁耦合来拟合磁性数据。
Four oximato-bridged trinuclear complexes [NiII2(Hpyaox)6MnIV]Cl·ClO4·6H2O (1), [NiII2(Hpyaox)6MnIV](ClO4)2·2DMF·4H2O (2), [NiII2(Hpyaox)6CrIII]ClO4·6H2O (3) and [NiII2(Hpyaox)6FeIII]ClO4·6H2O (4) based on pyridine-2-amidoxime (H2pyaox) were prepared in water–DMF solution. X-ray diffraction analysis reveals that they are isomorphous, and consist of linear triply oximato-bridged NiII2MnIV(1 and 2), NiII2CrIII(3) and NiII2FeIII(4) cations with MnIV, CrIIIand FeIIIions 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 NiN6coordination 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.
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影响因子：
4.6
作者：
M. Palacios;A. Mota;Jesus E. Perea-Buceta;Fraser J. White;E. Brechin;E. Colacio
通讯作者：
M. Palacios;A. Mota;Jesus E. Perea-Buceta;Fraser J. White;E. Brechin;E. Colacio
影响因子：
4.6
作者：
Sylvia Ross;T. Weyhermüller;E. Bill;K. Wieghardt;P. Chaudhuri
通讯作者：
Sylvia Ross;T. Weyhermüller;E. Bill;K. Wieghardt;P. Chaudhuri
DOI：
10.1002/chin.198028281
发表时间：
1980-04
期刊：
ChemInform
影响因子：
--
作者：
A. Singh;A. Chakravorty
通讯作者：
A. Singh;A. Chakravorty
影响因子：
2.8
作者：
F. Tuyéras;A. Scuiller;C. Duhayon;M. Hernández-molina;F. D. Biani;M. Verdaguer;T. Mallah;W. Wernsdorfer
通讯作者：
F. Tuyéras;A. Scuiller;C. Duhayon;M. Hernández-molina;F. D. Biani;M. Verdaguer;T. Mallah;W. Wernsdorfer
影响因子：
4.6
作者：
Kathryn M. Corbin;Joergen Glerup;D. Hodgson;M. H. Lynn;K. Michelsen;K. M. Nielsen
通讯作者：
Kathryn M. Corbin;Joergen Glerup;D. Hodgson;M. H. Lynn;K. Michelsen;K. M. Nielsen