Two Mononuclear Iron(II) Spin-Crossover Complexes with a N4O2 Coordination Sphere
Two Mononuclear Iron(II) Spin-Crossover Complexes with a N4O2 Coordination Sphere
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DOI：
10.1002/ejic.201201184
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发表时间：
2013-02
影响因子：
2.3
通讯作者：
Li Zhang;Guancheng Xu;Zheming Wang;Song Gao
中科院分区：
文献类型：
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作者：
Li Zhang;Guancheng Xu;Zheming Wang;Song Gao
成功合成了两种单核自旋交叉化合物Fe(L1)2 (1)和Fe(L2)2 (2){HL1 = 2-羟基-3-甲基-N'-[1-(吡啶-2-基)亚丁基]苯甲酰肼、HL2 = 2-羟基-N'-[1-(吡啶-2-基)亚丁基]苯甲酰肼}。化合物的磁性测量揭示了不同的热磁行为。化合物1经历了逐渐完全的热自旋交叉(SCO)，T1/2/ = 243/240 K，磁滞回线为3 K。化合物2在T1/2 ≈ 330 K的可测量温度范围内表现出逐渐不完全的SCO。通过将1和2与先前报道的相关化合物的磁性和结构结果进行比较，认为配体的烷基取代会影响配体场强度和氢键互动。此外，光磁学结果显示化合物 1 具有 87% 的光转化率和 36 K 的 T(LIESST)（LIESST = 光诱导激发自旋态捕获）。这些结果丰富了有关如何控制新系统中自旋交叉行为的知识。
Two mononuclear spin-crossover compounds Fe(L1)2 (1) and Fe(L2)2 (2) {HL1 = 2-hydroxy-3-methyl-N′-[1-(pyridine-2-yl)butylidene]benzohydrazide, HL2 = 2-hydroxy-N′-[1-(pyridine-2-yl)butylidene]benzohydrazide} were successfully synthesized. The magnetic measurements of the compounds revealed different thermal magnetic behavior. Compound 1 undergoes a gradual complete thermal spin crossover (SCO) with T1/2/ = 243/240 K and a hysteresis loop of 3 K. Compound 2 shows a gradual incomplete SCO during the measurable temperature region with T1/2 ≈ 330 K. Through the comparison of the magnetic and structural results for 1 and 2 with previously reported related compounds, the alkyl substitutions of the ligand were considered to affect the ligand-field strength and hydrogen-bonding interactions. In addition, photomagnetism results showed an 87 % photoconversion and 36 K of T(LIESST) (LIESST = light-induced excited spin-state trapping) for compound 1. The results enrich the knowledge on how to control the spin-crossover behavior in the new system.