| 研究生: |
劉曉嬋 Liu, Hsiao-chen |
|---|---|
| 論文名稱: |
鑭系金屬配位聚合物之單晶結構、磁性行為和骨架穩定度 Crystal Structures, Magnetic Behavior and Framework Stability of Lanthanide-Based Coordination Polymers |
| 指導教授: |
許桂芳
Hsu, Kuei-fang |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 87 |
| 中文關鍵詞: | 三維 、蜂巢 、水熱 |
| 外文關鍵詞: | solvothermal, dehydrated, three-dimensional |
| 相關次數: | 點閱:106 下載:1 |
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本論文是利用水熱反應合成五個新穎化合物,合成出的化合物會先經由單晶X-光繞射儀分析定出其結構,再藉由元素分析儀、粉末X-光繞射儀、磁性和熱重量/熱差分析儀輔助鑑定之。依其結構型態可分為二個不同的系統。第一個系統包含二個三維孔洞化合物[Nd2(H2O)4(C2O4)(C4H4O4)2]•4H2O (1)和[Na2(H2O)2Nd2(C2O4)3(C4H4O4)]•2H2O (2)。化合物1由丁二酸根將釹離子連結起來,形成二維的網狀結構。再由草酸根連接各層,形成具四方形通道的三維結構。化合物2由六個釹離子與六個草酸根形成類似蜂巢狀的層狀結構,並有丁二酸支撐在其中。層跟層之間則由草酸相連,構成三維結構。由其熱重量/熱差分析圖可知化合物1在脫去了所有的水之後形成穩定的中間產物[Nd2(C2O4)(C4H4O4)2]。將其與水反應數日之後,可回復結晶性。化合物1和2的磁性測量顯示,這二個化合物的mT值隨溫度下降而降低,且值皆為負值,由此推測,這二個化合物可能具有微弱的逆磁性。
在第二個系統中則包含了NH4[Nd(H2O)(C2O4)(SO4)] (3)、NH4[Eu(H2O)(C2O4)(SO4)] (4)和NH4[Gd(H2O)(C2O4)(SO4)] (5)這三個新穎三維化合物。之前,我們實驗室曾經以鈰金屬為中心,合成具有相似的化合物。其通式可寫為NH4[Ln(H2O)(C2O4)(SO4)] , (Ln=Ce、Nd、Eu、Gd)。由於硫酸根的鍵結方式不同,造成它們三維結構不同。NH4[Ce(H2O)(C2O4)(SO4)]中,硫酸根是以μ3:η2:η1:η1的方式連結鈰離子,形成一維的無機鍊。鍊與鍊之間藉著沿[001]與[01-1]方向的草酸根相連進而形成三維的結構。化合物3的硫酸酸根硫酸根是以μ3:η2:η1:η1的方式連結釹離子,形成二維的網狀結構,再由草酸根連結各層,形成三維的骨架。其中化合物4和5為等結構。在化合物4和5中,硫酸根是以μ3:η1:η1:η1的方式連結金屬離子,形成二維的層狀結構。再以草酸根連結各層,形成三維的骨架。化合物3和5的磁性測量顯示,這二個化合物的mT值隨溫度下降而降低,且值皆為負值,由此推測,這二個化合物可能具有微弱的逆磁性。
Five new lanthanide coordination polymers have been prepared under the mild solvothermal conditions. In [Nd2(H2O)4(C2O4)(C4H4O4)2]•4H2O (1), the succinates are assembled with the Nd3+ ions to form layers, which layers are then pillared by the oxalates yielding a porous framework, possessing open channels along the multiple-directions. The dehydrated phase of “Nd2(C2O4)(C4H4O4)2” sill sustains and which framework presents flexibility upon the reversible adsorption of water molecules. In [Na2(H2O)2Nd2(C2O4)3(C4H4O4)]•2H2O (2), the formation of honeycomb-like layer is facilitated by two in-plane oxalates where the presence of dimeric neodymium units are bridged through the succinates. The third out-of-plane oxalate pillars the layer into a new open framework.
The other three compounds adopt the general chemical stoichiometry of NH4[Ln(H2O)(C2O4)(SO4)] (Ln = Nd for 3, Eu for 4 and Gd for 5), which all crystallize in three-dimensional frameworks. The SO42- ligands apply the various connective fashions of μ3:η2:η1:η1 for 3, μ3:η1:η1:η1 for 4 and 5, and μ3:η2:η1:η1 for the Ce analogue prepared in the previous work and direct the various architectures formed in these frameworks.
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