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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >First report on N,N′-diisoalkylisonicotinamide 1D coordination network containing linear trinuclear [Co_3L_4Cl_6] units with mixed Co~(II)(T_d)-Co~(II)(O _h)-Co~(II)(T_d) geometries: Structure and magnetic properties
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First report on N,N′-diisoalkylisonicotinamide 1D coordination network containing linear trinuclear [Co_3L_4Cl_6] units with mixed Co~(II)(T_d)-Co~(II)(O _h)-Co~(II)(T_d) geometries: Structure and magnetic properties

机译：关于包含线性三核[Co_3L_4Cl_6]单元且混合Co〜（II）（T_d）-Co〜（II）（O _h）-Co〜（II）（T_d）几何结构的N，N'-二异烷基异烟酰胺酰胺一维配位网络的首次报道结构和磁性能

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摘要

Reaction of anhydrous CoCl_2 with N,N′- diisopropylisonicotinamide (L) has yielded a coordination polymer containing linear trinuclear [Co_3L_4Cl_6] units with a rare, mixed Co(T_d)-Co(O_h)-Co(T_d) assembly (compound 1). The central Co~(II) ion, of each trinuclear entity, exhibits a distorted octahedral geometry, with two ligand molecules coordinating through their carbonyl oxygen atoms along with two bridging Cl~- ions and two pyridine N atoms from the neighboring molecules. Also, in each unit, two outer Co~(II) ions display distorted tetrahedral geometry, coordinating to one ligand molecule through the pyridine N atom and to three Cl~- ions (one of them bridged to the central Co~(II) and the two acting as a terminal ligands). The magnetic properties of this compound were investigated in the temperature range of 2.0 to 300.0 K. Owing to the complexity of the system and the weak interactions among trinuclear aggregates, the magnetic response has been analyzed using a model which considers these units as isolated systems. In addition, magnetic data has been examined in two separated blocks, above and below 50 K, applying programs VPMAG FORTRAN and MAGPACK-fit, respectively. This way, only the most significant effects at each interval of temperature were considered: spin-orbit coupling of the Co(O_h), at high temperatures and zero-field splitting parameters of the Co(T_d) at the low. Spin-spin magnetic interaction has been taken into account for the whole range of temperatures. As a result, the analysis of the magnetic data shows that, within every trinuclear unit, the central position matches well with a high-spin Co~(II) (S = 3/2) and also reveals weak ferromagnetic interactions between the Co(O_h) and the two terminal Co(T_d) ions (J = +0.34 cm~(-1)).
机译：无水CoCl_2与N，N'-二异丙基异烟酰胺（L）的反应生成了配位聚合物，其中含有线性三核[Co_3L_4Cl_6]单元，具有稀有的Co（T_d）-Co（O_h）-Co（T_d）混合组分（化合物1） 。每个三核实体的中心Co〜（II）离子呈现出扭曲的八面体几何形状，其中两个配体分子通过其羰基氧原子配位，并且两个相邻分子的Cl_-离子和两个吡啶N原子配位。同样，在每个单元中，两个外部Co〜（II）离子表现出扭曲的四面体几何形状，通过一个吡啶N原子与一个配体分子和三个Cl〜-离子配位（其中一个桥连到中心的Co〜（II）和两者作为末端配体）。在2.0至300.0 K的温度范围内研究了该化合物的磁性能。由于系统的复杂性和三核聚集体之间的相互作用较弱，因此使用了将这些单元视为独立系统的模型来分析了磁响应。此外，磁数据已经分别在两个分开的程序块（50 K以上和以下）中进行了检查，分别使用程序VPMAG FORTRAN和MAGPACK-fit。这样，仅考虑每个温度间隔的最显着影响：高温下Co（O_h）的自旋轨道耦合，而低温下Co（T_d）的零场分裂参数。自旋-自旋磁相互作用已考虑到整个温度范围。结果，对磁数据的分析表明，在每个三核单元内，中心位置与高自旋Co〜（II）（S = 3/2）很好地匹配，并且还揭示了Co（ O_h）和两个末端Co（T_d）离子（J = +0.34 cm〜（-1））。

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