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Multifunctional Ni(II)-Based Metamagnetic Coordination Polymers for Electronic Device Fabrication.
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-06-10 , DOI: 10.1021/acs.inorgchem.0c00389
Pravat Ghorai 1 , Arka Dey 2, 3 , Paula Brandão 4 , Samia Benmansour 5 , Carlos J Gómez García 5 , Partha Pratim Ray 2 , Amrita Saha 1
Affiliation  

The combination of two 8-aminoquinoline-based Schiff base ligands (L1 and L2) with SCN and Ni(II) has led to the synthesis of two new one-dimensional thiocyanato-bridged coordination polymers: [Ni(L1)(NCS)2]n (1) and [Ni(L2)(NCS)2]n (2). Both compounds are isostructural and consists of regular zigzag thiocyanato-bridged chains with very weak S···S interchain interactions. The measured room-temperature conductivities of compounds 1 and 2 (7.0 × 10–5 and 2.0 × 10–5 S m–1, respectively) are indicative of semiconductor behavior which increases in the presence of photoillumination (3.5 × 10–4 and 4.9 × 10–4 S m–1, respectively). The measured IV characteristics of compound 1 and 2 based thin film metal–semiconductor (MS) junction devices under irradiation and nonirradiation conditions show a nonlinear rectifying behavior, typical of a Schottky diode (SD). The rectification ratios (Ion/Ioff) of the SDs in the dark at ±2 V (26.96 and 31.96 for 1- and 2-based devices, respectively) increase to 44.19 and 79.42, respectively, upon light irradiation. The photoinduced behavior has been analyzed by thermionic emission theory, and to determine the diode parameters, the Cheung’s method has been employed. These diode parameters indicate that compound 2 has a better performance in comparison to compound 1 and that these materials are good candidates for applications in electrochemical devices. Magnetic measurements show that both compounds present ferromagnetic Ni–Ni intrachain and weak antiferromagnetic interchain interactions. The isothermal magnetizations at 2 K show that both compounds are metamagnets with critical fields of ca. 130 mT in 1 and 90 mT in 2 at 2 K. In the ferromagnetic phase (above the critical field), both compounds exhibit a long-range ferromagnetic order with critical temperatures of around 3.5 K in 1 and 3.0 K in 2. DC and AC measurements with different applied DC fields confirm the metamagnetic behaviors and have allowed the determination of the magnetic phase diagram in both compounds.

中文翻译:

用于电子设备制造的多功能Ni(II)基超磁配位聚合物。

两种基于8-氨基喹啉的席夫碱配体(L1和L2)与SCN 和Ni(II)的结合已导致合成了两种新的一维硫氰酸根桥连的配位聚合物:[Ni(L1)(NCS)2 ] n1)和[Ni(L2)(NCS)2 ] n2)。这两种化合物都是同构的,由规则的锯齿形硫氰酸根桥连链组成,具有很弱的S··S链间相互作用。化合物12(7.0×10 –5和2.0×10 –5 S m –1的室温电导率的测量值分别表示半导体行为,这种行为在有光照明的情况下会增加(分别为3.5×10 –4和4.9×10 –4 S m –1)。所测量的- V化合物的特性12的照射和nonirradiation条件下系薄膜金属-半导体(MS)结器件表现出非线性的整流特性,典型的肖特基二极管(SD)的。在±2 V的黑暗中SD的整流比(I on / I off)(12分别为26.96和31.96基于光的设备)在光照后分别增加到44.19和79.42。通过热电子发射理论分析了光致行为,并使用Cheung方法确定了二极管参数。这些二极管参数表明,与化合物1相比,化合物2具有更好的性能,并且这些材料是电化学设备中应用的良好选择。磁性测量表明,这两种化合物均具有铁磁性的Ni-Ni链内和弱的反铁磁性的链间相互作用。在2 K时的等温磁化强度表明这两种化合物都是具有约ca临界场的超磁体。130 mT的在1和90公吨2在铁磁相中(在临界场以上),两种化合物均表现出远距离铁磁有序,其临界温度在1中约为3.5 K,在2中约为3.0K 。在不同的施加的直流磁场下进行的直流和交流测量证实了亚磁行为,并允许确定两种化合物的磁相图。
更新日期:2020-07-06
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