本文分成兩部分，第一部分是利用Hpppd (1-(pyridin-2-yl)-3-(1H-pyrrol-2-yl)propane-1,3-dione)以及鑭系(III)金屬離子合成一系列的單核鑭系金屬錯合物，利用單晶X繞射儀鑑定其主結構為一個Hpppd、五個配位水以及一個配位甲醇所形成的單核鑭系錯合物。在交流磁化率(alternative current susceptibility, ac)的研究中發現，在零場時只有3Dy有磁緩現象發生，其磁異向能(Ueff)為82.5 K，在外加場下，除了4Ho以外的結構都有磁緩現象的產生，其磁異向能分別為33.7 K (1Gd)、129.5 K(3Dy)、35.3 K(5Er)以及135.2 K(6Yb)，而2Tb在高溫以及低溫有其各自的磁緩過程，其各自的磁異向能分別為5.0 K (低溫過程)以及22.7 K (高溫過程)，交流磁化率的研究中最令人驚訝的是6Yb的磁異向能竟高達135.2 K，比任何一個在過去文獻研究的單核Yb還高，是目前單核Yb中磁異向能最高的。
第二部分是利用Heppd (1-(2-ethoxyphenyl)-3-(pyridin-2-yl)propane-1,3-dione) 以及鑭系(III)金屬離子合成一系列的雙核鑭系金屬錯化合物，利用單晶X繞射儀鑑定其主結構為三個Heppd配位，利用Heppd上的氧做為橋接來形成Ln2O3的配位環境，而雙核的錯合物的兩個鑭系金屬的配位環境是不同的，Ln1是十配位的幾何結構而Ln2是八配位的幾何結構，所形成的雙核不對稱錯合物，在過去的文獻中，雙核的不對稱錯合物不曾有十配位與八配位所構成的。在交流磁化率(alternative current susceptibility, ac)的研究中發現，只有9Dy在外加場下有磁緩的現象出現，其磁異向能為60.0 K。

There are two parts to this work. For the first part, the family of isostructural mononuclear lanthanide complexes [Ln(LH*)(H2O)5(MeOH)]Cl3·2H2O (Ln = Gd(1 Gd), Tb(2Tb), Dy(3Dy), Ho(4Ho), Er(5Er) and Yb(6Yb); LH* = a zwitterionic form of β-diketone ligand) were synthesized by using a bidentate chelating β-diketone ligand and lanthanide(III) chloride hexahydrate. The single-crystal X-ray diffraction studies show that all complexes crystallized in the triclinic P1 ̅. The local geometry of the LnIII ions in all complexes determined a square antiprism geometry (D4d). For the 3Dy, the magnetic property has been studied that it exhibits slow magnetic relaxations under zero dc field with the energy barrier (Ueff) of 82.5 K, but for 1Gd, 2Tb, 4Ho, 5Er and 6Yb negligible χ' signal were observed. Interestingly, 1Gd, 3Dy and 5Er exhibited slow relaxation of the magnetization under an applied dc field with effective energy barriers (Ueff) of 33.7 K、129.5 K and 35.3 K, respectively. Especially, 2Tb showed a two slow relaxation of the magnetization processes under the applied magnetic field of 1500 Oe, corresponding to the low temperature process and high temperature process with energy barrier (Ueff) of 5.0 K and 22.7 K, respectively. Strikingly, 6Yb exhibits the effective value of the energy barrier of 135.2 K, which is among the highest ones currently known for purely 4f single molecule magnets based on Yb(III).
For the second part, the new series of isostructural dinuclear complexes [LnIII2(eppd)3(NO3)3]·MeCN·xH2O (LnIII = Tb(8Tb), Dy(9Dy) and Ho(10Ho); x = 0.8 for 8Tb and 10Ho, x = 1 for 9Dy) were synthesized by using a bidentate chelating β-diketone ligand (Heppd) and lanthanide(III) nitrate pentahydrate. The single-crystal X-ray diffraction studies show that the dinuclear complexes are bridged by the alkoxide groups of three ligand (eppd) leading to Ln2¬O3 core. The Ln1 site presents a N2O8 and Ln2 site present a N1O7 coordination environment. Magnetic studies reveal that no maximum signal for 9Dy was found below 10 K, but for 8Tb and 10Ho negligible χ' signal were observed. Under the applied field, no maximum signal for 8Tb was found below 10 K with an energy barrier of 8.4 K and 9Dy show a slow magnetic relaxation with an energy barrier of 60.0 K.

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