Temperature-controlled polymorphism of chiral Cu(II)-Ln(III) dinuclear complexes exhibiting slow magnetic relaxation.
Temperature-controlled polymorphism of chiral Cu(II)-Ln(III) dinuclear complexes exhibiting slow magnetic relaxation.
复制标题
手性 Cu(II)-Ln(III) 双核配合物的温控多晶型表现出慢磁弛豫。
DOI:
10.1039/c5dt00789e
复制
发表时间:
2015-06
期刊:
影响因子:
--
通讯作者:
Tang Yun-Zhi
中科院分区:
文献类型:
--
作者:
Wen He-Rui;Bao Jun;Liu Sui-Jun;Liu Cai-Ming;Zhang Cai-Wei;Tang Yun-Zhi
A new family of 3d-4f dinuclear complexes derived from a chiral Schiff-base ligand, (R,R)-N,N'-bis(3-methoxysalicylidene)cyclohexane-1,2-diamine (H2L), has been synthesized and structurally characterized, namely, [Cu(L)Ln(NO3)3(H2O)] (Ln = Ce (1) and Nd (2)), [Cu(L)Sm(NO3)3]·2CH3CN (3) and [Cu(L)Ln(NO3)3] (Ln = Eu (4), Gd (5 and 5'), Tb (6 and 6'), Dy (7 and 7'), Ho (8), Er (9) and Yb (10)). Structural determination revealed that these complexes are composed of two diphenoxo-bridged Cu(II)-Ln(III) dinuclear clusters with slight structural differences. Complexes 1, 2 and 4-7 crystallize in the chiral space group P1, and the space group of 3 is P2₁, while the other six complexes (5'-7' and 8-10) are isomorphous and each of them contains two slightly different Cu(II)-Ln(III) dinuclear clusters in the asymmetric unit with the chiral space group P2₁. Magnetic investigations showed that ferromagnetic couplings between the Cu(II) and Ln(III) ions exist in 5-7 and 5'-7'. Moreover, the alternating current (ac) magnetic susceptibilities of 6, 6', 7 and 7' showed that both the in-phase (χ') and out-of-phase (χ'') are frequency- and temperature-dependent with a series of frequency-dependent peaks for the χ'', which being typical features of field-induced slow magnetic relaxation phenomena. For 8, a frequency dependent χ' with peaks but χ'' without peaks appeared; however, the compound displays field-induced slow magnetic relaxation behavior. Furthermore, no obvious frequency-dependent ac signal was observed in 9 owing to the absence of the easy-axis anisotropy. More significantly, we observed the temperature-controlled reversible conversion from one chiral single-crystal (5-7) to another chiral single-crystal (5'-7') exhibiting slow magnetic relaxation.
登录
查看更多内容
DOI:
10.1021/cg2009368
发表时间:
2011-10
期刊:
Crystal Growth & Design
影响因子:
--
作者:
Da-Peng Dong;Lei Liu;Zhen-Gang Sun;Cheng-Qi Jiao;Zhong-Min Liu;Chao Li;Yan-Yu Zhu;Kai Chen;Cheng-Lin Wang
通讯作者:
Cheng-Lin Wang
DOI:
10.1007/s11426-012-4590-1
发表时间:
2012-05
期刊:
Science China Chemistry
影响因子:
--
作者:
Liu, Sui-Jun;Song, Wei-Chao;Xue, Li;Han, Song-De;Zeng, Yong-Fei;Wang, Li-Fu;Bu, Xian-He
通讯作者:
Bu, Xian-He
影响因子:
4.3
作者:
Coronado, E;Galán-Mascarós, JR;Murcia-Martínez, A
通讯作者:
Murcia-Martínez, A
影响因子:
4.6
作者:
M. Kahn;C. Mathonière;O. Kahn
通讯作者:
M. Kahn;C. Mathonière;O. Kahn
影响因子:
4.6
作者:
Zhao Lang;Wu Jianfeng;Ke Hongshan;Tang Jinkui
通讯作者:
Tang Jinkui