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首页> 外文期刊>Crystal growth & design >Thermal Transformation of a Zero-Dimensional Thiocyanate Precursor into a Ferromagnetic Three-Dimensional Coordination Network via a Layered Intermediate
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Thermal Transformation of a Zero-Dimensional Thiocyanate Precursor into a Ferromagnetic Three-Dimensional Coordination Network via a Layered Intermediate

机译：通过分层中间体热转化零尺寸硫氰酸盐前体的铁磁三维配位网络

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摘要

Reaction of Co(NCS)(2) with 2,6-dimethylpyrazine (2,6-DMPy) leads to the formation of a compound with the composition Co (NCS)(2)(2,6-DMPy)(4) (Co-0D) that consists of discrete complexes, in which the Co cations are octahedrally coordinated. Upon heating, half of the 2,6-DMPy ligands are removed leading to the two-dimensional coordination polymer [Co(NCS)(2)(2,6-DMPy)(2)] (Co-2D), shown by thermogravimetry and X-ray powder diffraction. On further heating, the intermediate Co-2D loses the next 2,6-DMPy ligand and transforms into [Co(NCS)(2)(2,6-DMPy)](n) (Co-3D). The crystal structures of Co-2D and Co-3D were solved and refined using powder X-tay diffraction data. The crystal structure of Co-2D consists of octahedrally coordinated Co cations that are linked by pairs of anionic ligands into dimers, which are further connected by single thiocyanate anions into layers. In Co-3D, octahedrally and tetrahedrally coordinated Co-cations are present, that are linked by mu-1,3-bridging single thiocyanate anions into a novel three-dimensional network. Magnetic, measurements for Co-0D show paramagnetic behavior and slow relaxations of the magnetization in an applied field due to single: ion magnet behavior. For Co-2D the antifertomagnOic exchange interaction leads to the maximum of susceptibility at 6.0 K, but a long-range ordering is observed at 2.2 K. In contrast, the ferromagnetic order is observed in Co-3D below 3.75 K.,The phase transitions are invstigated by specific heat measurements.
机译：CO（NCS）（2）与2,6-二甲基吡嗪（2,6-DMPY）的反应导致与组合物CO（NCS）（2）（2,6- DMPY）（4）（4）（由离散复合物组成的CO-0d，其中CO阳离子是八大阳离子的协调。加热后，除去2,6-DMPY配体的一半，导致二维配位聚合物[CO（NCS）（2）（2,6- DMPY）（2）]（CO-2D），由ThermoGrimetry表示和X射线粉末衍射。在进一步加热上，中间体CO-2D输掉了接下来的2,6- DMPY配体，并转化为[CO（NCS）（2）（2,6- DMPY）]（N）（CO-3D）。使用粉末X-Tay衍射数据解决和改进CO-2D和CO-3D的晶体结构。 CO-2D的晶体结构由八面体协调的CO阳离子组成，该CO阳离子通过对阴离子配体对连接成二聚体，其通过单一硫氰酸酯阴离子进一步连接到层中。在CO-3D中，存在八面体和四面体协调的共阳离子，其通过MU-1,3-桥接单硫氰酸盐阴离子连接到新的三维网络中。 CO-0D的磁性测量显示了由于单一：离子磁体行为引起的施加场中磁化的顺磁性行为和慢速放松。对于CO-2D，防熔锥体交换相互作用导致6.0克的敏感度最大，但在2.2K的情况下观察到远程排序。相反，在3.75k的CO-3D中观察到铁磁性阶数。相位过渡。通过特定的热测量终止。

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  • 来源
    《Crystal growth & design》 |2017年第7期|共9页
  • 作者

    Suckert Stefan; Rams Michal; Germann Luzia S.; Cegielka Daria M.; Dinnebier Robert E.; Naether Christian;

  • 作者单位

    Christian Albrechts Univ Kiel Inst Anorgan Chem Max Eyth Str 2 D-24118 Kiel Germany;

    Jagiellonian Univ Inst Phys Lojasiewicza 11 PL-30348 Krakow Poland;

    Max Planck Inst Solid State Res Heisenbergstr 1 D-70569 Stuttgart Germany;

    Jagiellonian Univ Inst Phys Lojasiewicza 11 PL-30348 Krakow Poland;

    Max Planck Inst Solid State Res Heisenbergstr 1 D-70569 Stuttgart Germany;

    Christian Albrechts Univ Kiel Inst Anorgan Chem Max Eyth Str 2 D-24118 Kiel Germany;

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