Spin transitions in Fe(II) metallogrids modulated by substituents, counteranions, and solvents.
Spin transitions in Fe(II) metallogrids modulated by substituents, counteranions, and solvents.
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DOI：
10.1021/ja312622c
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发表时间：
2013-04
影响因子：
15
通讯作者：
Yi-Tong Wang;Shu-Tao Li;Shu-Qi Wu;A. Cui;D. Shen;H. Kou
中科院分区：
文献类型：
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作者：
Yi-Tong Wang;Shu-Tao Li;Shu-Qi Wu;A. Cui;D. Shen;H. Kou
用两个双(三齿)希夫碱配体H_2L(X)构筑了三个2×2格型四核Fe(II)配合物1-3，得到了多核自旋交叉材料。磁化率测量表明，配合物的自旋态与H_2L(X)的取代基有关，自旋转变只发生在来源于大体积配体的配合物1和2中，而配合物3是抗磁性的。配合物1和2的转变温度接近室温，且与反阴离子有关。配合物1的自旋转变可以通过脱水和水合过程可逆地调节。
Two bis(tridentate) Schiff base ligands H2L(x) were used to construct three 2×2 grid-type tetranuclear Fe(II) complexes 1-3 to obtain polynuclear spin-crossover materials. Magnetic susceptibility measurements show that the spin states of the complexes are related to the substituents of H2L(x), and that spin transition occurs only in complexes 1 and 2, which are derived from a bulky ligand, whereas complex 3 is diamagnetic. The transition temperatures of complexes 1 and 2 are close to room temperature and are dependent on counteranions. The spin transition of complex 1 can be reversibly tuned by the dehydration and hydration process.