Wellm Carsten, Majcher-Fitas Anna M, Rams Michał, Näther Christian
Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, 24118 Kiel, Germany.
Dalton Trans. 2020 Dec 8;49(46):16707-16714. doi: 10.1039/d0dt03428b.
Reaction of Co(NCS)2 and Ni(NCS)2 with 4-tert-butylpyridine in ethyl acetate leads to the formation of mixed crystals of a layered compound with the composition [CoxNi1-x(NCS)2(4-tert-butylpyridine]n. The mixed crystal formation was investigated by a combination of atomic absorption spectroscopy, X-ray powder diffraction and IR spectroscopy. Magnetic and specific heat measurements prove dominating ferromagnetic exchange interactions within the layers and a ferromagnetic transition. Depending on the synthetic method, inhomogeneous samples were obtained, for which predominantly the large difference in the solubility of the homometallic compounds might be responsible. Very long reaction time leads to much better samples for which a distinct critical temperature is observed that increases smoothly with increasing Ni content.
Co(NCS)₂ 和 Ni(NCS)₂ 与 4-叔丁基吡啶在乙酸乙酯中反应，生成了组成为 [CoxNi1-x(NCS)₂(4-叔丁基吡啶)]n 的层状化合物混合晶体。通过原子吸收光谱、X 射线粉末衍射和红外光谱相结合的方法研究了混合晶体的形成。磁性和比热测量证明层内存在主导的铁磁交换相互作用以及铁磁转变。根据合成方法的不同，得到了不均匀的样品，这可能主要是由于同金属化合物溶解度的巨大差异所致。非常长的反应时间会得到更好的样品，观察到明显的临界温度，该温度随着 Ni 含量的增加而平滑升高。
