当前位置：
X-MOL 学术
›
Dalton Trans.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Crystal structures and magnetic properties of two series of phenoxo-O bridged dinuclear Ln2 (Ln = Gd, Tb, Dy) complexes
Dalton Transactions ( IF 3.5 ) Pub Date : 2017-11-01 00:00:00 , DOI: 10.1039/c7dt03441e Marek Machata 1, 2, 3, 4, 5 , Radovan Herchel 1, 2, 3, 4, 5 , Ivan Nemec 1, 2, 3, 4, 5 , Zdeněk Trávníček 1, 2, 3, 4, 5
Dalton Transactions ( IF 3.5 ) Pub Date : 2017-11-01 00:00:00 , DOI: 10.1039/c7dt03441e Marek Machata 1, 2, 3, 4, 5 , Radovan Herchel 1, 2, 3, 4, 5 , Ivan Nemec 1, 2, 3, 4, 5 , Zdeněk Trávníček 1, 2, 3, 4, 5
Affiliation
|
Six dinuclear lanthanide compounds of the formulae [Ln2(3m-L4)2(L2)2(MeOH)2]·6MeOH (Ln = Gd – 1a, Tb – 1b, and Dy – 1c) and [Ln2(3m-L4)2(L2)2(DMF)2] (Ln = Gd – 2a, Tb – 2b, and Dy – 2c; DMF = N,N-dimethylformamide, H23m-L4 = (2-[(E)-(3-metoxysalicylidene)amino]phenol), and HL2 = 1,3-diphenyl-1,3-diketopropane) were prepared and characterized by elemental analysis, FTIR spectroscopy, thermogravimetric measurements, single-crystal X-ray structural analysis, and magnetometry, and Gd2 and Dy2 compounds by ab initio methods as well. The structural analysis revealed the isostructurallity of the compounds within the series of 1a–c and 2a–c. The analysis of the variable temperature magnetic data showed the presence of a weak antiferromagnetic coupling in the Gd2 compounds (J/cm−1 = –0.13 for 1a and J/cm−1 = –0.17 for 2a). The magnetocaloric effect was studied on compound 2a with the maximum value of −ΔSM = 22.9 J kg−1 K−1 at T = 2.0 K and B = 9 T, which is the highest value among the Gd2 double phenoxo-bridged compounds observed up to now. Both the Dy2 compounds (1c and 2c) exhibit slow-relaxation of magnetization in zero external static magnetic field. Magnetic anisotropy, intradimer magnetic coupling and magnetization blocking barriers were also studied by ab initio methods for 1c and 2c.
中文翻译：
两种苯氧-O桥连双核Ln 2（Ln = Gd，Tb，Dy）配合物的晶体结构和磁性
六个分子式为[Ln 2（3m-L4）2（L2）2（MeOH）2 ]·6MeOH（Ln = Gd – 1a，Tb – 1b和Dy – 1c）和[Ln 2（3m- L4）2（L2）2（DMF）2 ]（Ln = Gd – 2a，Tb – 2b和Dy – 2c ; DMF = N，N-二甲基甲酰胺，H 2 3m-L4 =（2-[（E）-（（3-甲氧基水杨基亚胺基）氨基]酚）和HL2 = 1,3-二苯基-1,3-二酮丙烷）的制备并通过元素分析，FTIR光谱，热重测量，单晶X射线结构分析，以及从头算方法获得的Gd 2和Dy 2化合物。结构分析表明，化合物在1a–c和2a–c系列中的同构性。对可变温度磁数据的分析表明，Gd 2化合物中存在弱的反铁磁耦合（对于1a和J / cm，J / cm -1 = –0.13-1 = –0.17（对于2a）。磁热效应进行了研究关于化合物2A与-Δ的最大值小号中号= 22.9Ĵ千克-1 ķ -1在Ť = 2.0 K和乙= 9 T，其是其中的Gd的最高值2双phenoxo桥接到目前为止观察到的化合物。两种Dy 2化合物（ 1c和2c）在零外部静磁场中均表现出缓慢的磁化弛豫。还通过从头算方法研究了1c的磁各向异性，二聚物内磁耦合和磁化阻挡层和2c。
更新日期：2017-11-15
中文翻译：
两种苯氧-O桥连双核Ln 2（Ln = Gd，Tb，Dy）配合物的晶体结构和磁性
六个分子式为[Ln 2（3m-L4）2（L2）2（MeOH）2 ]·6MeOH（Ln = Gd – 1a，Tb – 1b和Dy – 1c）和[Ln 2（3m- L4）2（L2）2（DMF）2 ]（Ln = Gd – 2a，Tb – 2b和Dy – 2c ; DMF = N，N-二甲基甲酰胺，H 2 3m-L4 =（2-[（E）-（（3-甲氧基水杨基亚胺基）氨基]酚）和HL2 = 1,3-二苯基-1,3-二酮丙烷）的制备并通过元素分析，FTIR光谱，热重测量，单晶X射线结构分析，以及从头算方法获得的Gd 2和Dy 2化合物。结构分析表明，化合物在1a–c和2a–c系列中的同构性。对可变温度磁数据的分析表明，Gd 2化合物中存在弱的反铁磁耦合（对于1a和J / cm，J / cm -1 = –0.13-1 = –0.17（对于2a）。磁热效应进行了研究关于化合物2A与-Δ的最大值小号中号= 22.9Ĵ千克-1 ķ -1在Ť = 2.0 K和乙= 9 T，其是其中的Gd的最高值2双phenoxo桥接到目前为止观察到的化合物。两种Dy 2化合物（ 1c和2c）在零外部静磁场中均表现出缓慢的磁化弛豫。还通过从头算方法研究了1c的磁各向异性，二聚物内磁耦合和磁化阻挡层和2c。
京公网安备 11010802027423号