本文分成兩部分，第一部分利用1-(2-methoxyphenyl)-3-(pyridin-2-yl)propane-1,3-dione (Hmppd)分別與鋅(II)及鑭系(III)金屬離子合成出一系列3d-4f三核直線型鏈狀混金屬錯合物[ZnII2LnIII(Hmppd)2(μ2-OAc)4(μ2-η1:η2-OAc)]n (Ln = (1)Gd, (2)Tb, (3)Dy, (4)Ho)，並藉由單晶X光繞射儀鑑定其結構。其錯合物金屬中心透過兩個配位基mppd-和四個醋酸根形成三核的結構，兩個三核團簇在藉由醋酸橋接形成鏈狀聚合物。交流磁化率(alternative current susceptibility, ac)來發現，1∙Gd和3∙Dy在外加磁場的情況下有磁緩現象的發生，其磁異向能(Ueff)分別為31.62 K和105.56 K。此外，1∙Gd在溫度2 K並外加7 Tesla的磁場時，擁有13.66 J mol-1K-1的磁熵變化量。
第二部分利用1-(1-ethyl-1H-pyrrol-2-yl)-3-(pyridin-2-yl)propane-1,3-dione (Heppd)分別與鋅(II)及鑭系(III)金屬離子反應合成出一系列3d-4f雙核混金屬錯合物[ZnIILnIII(L)2Cl(H2O)4][ZnCl4]∙MeCN∙xH2O (Ln = (5)Gd, (6)Tb, (7)Dy, (8)Ho, (9)Er)，並藉由單晶X光繞射儀靜定其結構。其金屬中心透過兩個配位基eppd-橋接形成雙核金屬錯合物。交流磁化率(alternative current susceptibility, ac)測量發現7∙Dy在零外加磁場的情況下，有磁緩現象的發生，其磁異向能(Ueff)為241.39 K。而9∙Er在外加800 Oe的磁場的情況下測得其磁異向能(Ueff)為12.21 K。對比相似結構的銅鑭系雙核金屬團簇的磁性表現，發現微弱的交換交互作用力(exchange coupling)會使量子穿隧效應(Quantum Tunneling Magnetization, QTM)增強，進而降低磁異向能的表現。 

There are two parts in this work. For the first part, a family of isostructural Zn-Ln-Zn chains (Ln = Gd, Tb, Dy, Ho) using a β-diketone ligand (Hmppd = 1-(2-methoxyphenyl)-3-(pyridin-2-yl)propane-1,3-dione), zinc(II) acetate, and lanthanide(III) acetate is reported. Single-crystal X-ray diffraction studies show that the chain-complexes crystallized in triclinic P 1 ̅. The Zn-Ln-Zn cores that are bridged by two mppd- ligands, three μ2-acetates, and one μ2-η 1: η 2-acetate. The trimers are connected by a μ2-acetate on the terminal Zn ions to form a 1D chain. In zero field ac susceptibility measurement, no maximum signal for complex 3∙Dy was found below 15 K, but for complexes 1∙Gd, 2∙Tb and 4∙Ho negligible χ" signal were observed. Only complexes 1∙Gd and 3∙Dy showed a slow magnetic relaxation in an applied field based on ac data. The energy barrier for complexes 1∙Gd (under 2500 Oe) and 3∙Dy (under 3000 Oe), as estimated from Arrhenius plots, were determined to be 31.62 and 105.56 K, respectively. The relatively large quantum tunneling magnetization (QTM) process of complex 3∙Dy in a zero field may due to the weak axial crystal field provided by the Hmppd ligand. In addition, the magnetic entropy change (-∆S_m) of 1∙Gd was estimated to be 13.66 J mol-1K-1 at 2 K for ∆H = 7 T.
For the second prat, the syntheses, structures and magnetic properties of a series isostructural Zn-Ln complexes [ZnIILnIII(eppd)2Cl(H2O)4][ZnCl4]∙MeCN∙xH2O (Ln = (5)Gd, (6)Tb, (7)Dy, (8)Ho, (9)Er) (Heppd = 1-(1-ethyl-1H-pyrrol-2-yl)-3-(pyridin-2-yl)propane-1,3-dione)were reported. The N2O4 pocket created by two eppd- ligands chelating the ZnII and DyIII ions and provide a better axiality for DyIII ion. In zero field ac susceptibility measurement, 7∙Dy exhibit strong magnetic relaxation up to 40 K and the energy barrier (Ueff) was estimated to be 241.39 K. Upon 1000 Oe dc field was applied, the QTM process were suppressed entirely, resulting in a thermal barrier (Ueff) of 334.26 K. Also, the 9∙Er shows a field induced magnetic relaxation under 800 Oe applied dc field. The energy barrier was estimated to be 12.21 K.

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