Synthesis, crystal structure and magnetic properties of a novel manganese(II)-nitronyl nitroxide-azido(μ_(1,1) and μ_(1,3)) one-dimensional complex

A novel one-dimensional manganese(Ⅱ) complex containing nitronyl nitroxide radical [Mn2(IM2-py)2(Ac)2((μ1.1-N3)(μ1,3-N3) . EtOH]n was synthesized and characterized structurally and magnetically. It crystallizes in the monoclinic space group p21/n. Each Mn(Ⅱ) ion is six-coordinated in a distorted octahedral environment. The two N atoms of the nitronyl nitroxide radical and the two O atoms of acetate ligands are in the equatorial plane, whereas the two different azido bridging ligands are in trans axial position. Mn(Ⅱ) ions are linked by nitrogen atom of μ1,1-azido and oxygen atoms of two carboxy groups to form a Mn-Mn unit. Mn-Mn units are linked by azido ligands through u1,3 bridging style to form a one-dimensional chain. The compound is connected by the coordination bonds,π-π interactions and hydrogen bonds as a three-dimensional structure. Magnetic susceptibility data support that there are stronger antiferromagnetic interactions between the radical and Mn(Ⅱ) ion, weak antiferromagnetic inter     

Synthesis and Crystal Structure of a Novel Complex [Cu(Phen)3](ClO4)2(btio)(H2O)

1 INTRODUCTION There has been increasing interest of Cu(II) and phenanthroline complexes in the field of coor- dination chemistry[1～4]. At the same time, nitronyl nitroxide radicals have played a prominent role in the design and construction of molecula…     

自由基-Mn(Ⅱ)链状配合物的合成、晶体结构和磁性研究

报道了一个由叠氮和羧基混桥联接的自由基-Mn(Ⅱ)一维锯齿链状配合物: [Mn2(IM2-Py)2(Ac)2 (μ1,1-N3)(μ1,3-N3)@EtOH]n [IM2-Py = 2-(2′-吡啶基)4,4,5,5-四甲基咪唑啉-1-氧基自由基]的合成、晶体结构和磁性. 晶体属单斜晶系, P21/n空间群. 配合物中每个Mn(Ⅱ)离子处于变形八面体的配位环境, 赤道平面由自由基配体上的两个N原子和两个乙酸根上的氧原子组成; μ1,1-N3和μ1,3-N3中的两个N原子处于轴向位置. Mn(Ⅱ)离子通过μ1,1-N3上的N原子以及两个羧基彼此相连构成了一个双Mn单元, 每个双锰单元通过N-3(μ1,3)连成一维锯齿状链. 配合物依次通过配位键、π-π相互作用、氢键构成了三维网状结构. 文中提出一种处理具有三种不同磁相互作用的新的近似理论模型, 磁分析表明体系中Mn(Ⅱ)和自由基间存在较强的反铁磁相互作用, Mn-R与Mn-R之间存在弱的反铁磁相互作用, 双锰单元间存在极弱的反铁磁相互作用.     

由基-Mn(Ⅱ)链状配合物的合成、晶体结构和磁性研究

报道了一个由叠氮和羧基混桥联接的自由基-Mn(Ⅱ)一维锯齿链状配合物: [Mn₂(IM2-Py)₂(Ac)₂(μ_1,1-N₃)(μ₁,3-N_3m)·EtOH]_n[IM2-Py = 2-(2′-吡啶基)4,4,5,5-四甲基咪唑啉-1-氧基自由基]的合成、晶体结构和磁性. 晶体属单斜晶系, P2₁/n空间群. 配合物中每个Mn(Ⅱ)离子处于变形八面体的配位环境, 赤道平面由自由基配体上的两个N原子和两个乙酸根上的氧原子组成; μ_1,1-N₃和μ_1,3-N₃中的两个N原子处于轴向位置. Mn(Ⅱ)离子通过μ_1,1-N₃上的N原子以及两个羧基彼此相连构成了一个双Mn单元, 每个双锰单元通过N-3(μ_1,3)连成一维锯齿状链. 配合物依次通过配位键、π-π相互作用、氢键构成了三维网状结构. 文中提出一种处理具有三种不同磁相互作用的新的近似理论模型, 磁分析表明体系中Mn(Ⅱ)和自由基间存在较强的反铁磁相互作用, Mn-R与Mn-R之间存在弱的反铁磁相互作用, 双锰单元间存在极弱的反铁磁相互作用.