正方形反棱镜
磁化
化学
结晶学
钆
镝
镧系元素
放松(心理学)
分子
三斜晶系
顺磁性
离子
磁化率
无机化学
晶体结构
磁场
凝聚态物理
物理
社会心理学
心理学
有机化学
量子力学
作者
Marta Orts-Arroyo,Adrián Sanchis-Perucho,Nicolás Moliner,Isabel Castro,Francesc Lloret,José Martı́nez-Lillo
出处
期刊:Inorganics (Basel)
[Multidisciplinary Digital Publishing Institute]
日期:2022-03-03
卷期号:10 (3): 32-32
被引量:9
标识
DOI:10.3390/inorganics10030032
摘要
Gadolinium (III) complexes exhibiting slow relaxation of magnetization are uncommon and have been much less studied than other compounds based on anisotropic lanthanide (III) ions. We prepared two one-dimensional gadolinium (III) complexes based on α-glycine (gly) and β-alanine (β-ala) amino acids, with the formula {[Gd2(gly)6(H2O)4](ClO4)6·5H2O}n (1) and {[Gd2(β-ala)6(H2O)4](ClO4)6·H2O}n (2), which were magneto-structurally characterized. Compounds 1 and 2 crystallize in the triclinic system (space group Pī). In complex 1, two Gd (III) ions are eight-coordinate and bound to six oxygen atoms from six gly ligands and two oxygen atoms from two water molecules, the metal ions showing different geometries (bicapped trigonal prism and square antiprism). In complex 2, two Gd (III) ions are nine-coordinate and bound to seven oxygen atoms from six β-ala ligands and two oxygen atoms from two water molecules in the same geometry (capped square antiprism). Variable-temperature dc magnetic susceptibility measurements performed on microcrystalline samples of 1 and 2 show similar magnetic behavior for both compounds, with antiferromagnetic coupling between the Gd (III) ions connected through carboxylate groups. Ac magnetic susceptibility measurements reveal slow relaxation of magnetization in the presence of an external dc field in both compounds, hence indicating the occurrence of the field-induced single-molecule magnet (SMM) phenomenon in both 1 and 2.
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