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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Goblet-shaped pentanuclear lanthanide clusters assembled with a cyclen derivative ligand exhibiting slow magnetic relaxation
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Goblet-shaped pentanuclear lanthanide clusters assembled with a cyclen derivative ligand exhibiting slow magnetic relaxation

机译:高脚杯状五核镧系元素簇与周期数衍生物配体组装在一起,表现出缓慢的磁弛豫

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摘要

Two coordination compounds with the formula Ln(5)(H2O)(OH)(4)(NO3)(3)(BZA)(4)L (Ln = Tb3+ (1), Dy3+ (2)) have been assembled in a one-pot synthesis from the tetrasubstituted cyclen derivative ligand N,N',N '',N'''-tetra-(2-hydroxy-3-methoxy-5-methylbenzyl)-1,4,7,10-tetraazacyclododecane (H4L), Ln(NO3)(3)center dot xH(2)O (Ln = Tb3+ (x = 6), Dy3+ (x = 5)) and the auxiliary ligand benzoic acid (HBZA). Single-crystal X-ray diffraction studies reveal that both compounds feature a novel homometallic appended cubane geometry. The magnetic study on 1 suggests the presence of anti-ferromagnetic interactions, whereas 2 exhibits weak ferromagnetic coupling. Under an applied dc field, 1 shows no out-of-phase alternating current (ac) signal whereas 2 shows slow-relaxation processes that correspond to an energy gap (E-a/k(B)) of 4.11 K and a pre-exponential factor (tau(0)) of 3.45 x 10(-5) s.
机译:分子式为Ln(5)(H2O)(OH)(4)(NO3)(3)(BZA)(4)L(Ln = Tb3 +(1),Dy3 +(2))的两个配位化合物由四取代的环生衍生物配体N,N',N'',N'''-四-(2-羟基-3-甲氧基-5-甲基苄基)-1,4,7,10-四氮杂环十二烷(一锅法合成) H4L),Ln(NO3)(3)中心点xH(2)O(Ln = Tb3 +(x = 6),Dy3 +(x = 5))和辅助配体苯甲酸(HBZA)。单晶X射线衍射研究表明,这两种化合物均具有新颖的均金属附加的古巴几何形状。 1的磁性研究表明存在反铁磁相互作用,而2则显示弱铁磁耦合。在施加的直流电场下,1表示没有异相交流(ac)信号,而2表示慢速松弛过程,对应于4.11 K的能隙(Ea / k(B))和一个指数前因子(tau(0))为3.45 x 10(-5)s。

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