Structures and magnetic properties of several phenoxo-O bridged dinuclear lanthanide complexes: Dy derivatives displaying substituent dependent magnetic relaxation behavior.
Nine dinuclear Ln(iii) complexes, [Ln(dbm)2(L)]2 (Ln = Eu (), Tb (), Dy (), Ho (), Er ()) and [Ln(dbm)2(L')]2 (Ln = Tb (), Dy (), Ho (), Er ()) (dbm = 1,3-diphenyl-1,3-propanedione, HL = 2-[[(4-methoxy-phenyl)imino]methyl]-8-hydroxy-quinoline and HL' = 2-[[(4-ethoxyphenyl)imino]methyl]-8-hydroxyquinoline) have been synthesized, and structurally and magnetically characterized. The nine complexes are all phenoxo-O bridged binuclear complexes, in which Ln1 and Ln1a are in an eight-coordinated environment bridged by two phenoxido oxygen atoms of two 8-hydroxyquinoline Schiff base ligands. Although complexes and have very similar structures, magnetic studies reveal that they exhibit different magnetic relaxation behaviors with the effective barriers (ΔE/kB) of 34.5 K for and 67.6 K for . The dissimilar dynamic magnetic behaviors of and mostly result from the different electron-donating effect induced by the two alkoxy (-OCH3 and -OC2H5) of the 8-hydroxyquinoline Schiff base ligands. Meanwhile, for complexes , , and , there are no observed magnetic relaxation behaviors under a zero dc field. In addition, the luminescence properties of , and were studied.
Department of Chemistry, Tianjin University, Tianjin, 300072, China. cuijianzhong@tju.edu.cn and Department of Chemistry, Key Laboratory of Advanced Energy Material Chemistry, MOE, TKL of Metal and Molecule Based Material Chemistry, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, China. zhaobin@nankai.edu.cn.
Wen-Min
WM
Wang
Department of Chemistry, Key Laboratory of Advanced Energy Material Chemistry, MOE, TKL of Metal and Molecule Based Material Chemistry, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, China. zhaobin@nankai.edu.cn.
Wan-Zhen
WZ
Qiao
Department of Chemistry, Tianjin University, Tianjin, 300072, China. cuijianzhong@tju.edu.cn.
Hong-Xia
HX
Zhang
Department of Chemistry, Tianjin University, Tianjin, 300072, China. cuijianzhong@tju.edu.cn.
Shi-Yu
SY
Wang
Department of Chemistry, Tianjin University, Tianjin, 300072, China. cuijianzhong@tju.edu.cn.
Yao-Yao
YY
Nie
Department of Chemistry, Tianjin University, Tianjin, 300072, China. cuijianzhong@tju.edu.cn.
Hong-Man
HM
Chen
Department of Chemistry, Tianjin University, Tianjin, 300072, China. cuijianzhong@tju.edu.cn.
Zhen
Z
Liu
Department of Chemistry, Tianjin University, Tianjin, 300072, China. cuijianzhong@tju.edu.cn.
Hong-Ling
HL
Gao
Department of Chemistry, Tianjin University, Tianjin, 300072, China. cuijianzhong@tju.edu.cn.
Jian-Zhong
JZ
Cui
Department of Chemistry, Key Laboratory of Advanced Energy Material Chemistry, MOE, TKL of Metal and Molecule Based Material Chemistry, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, China. zhaobin@nankai.edu.cn.
Bin
B
Zhao