利用水熱和離子熔液法合成鑭系金屬草酸化合物; The Synthesis of Lanthanide Oxalates by Using Hydrothermal and Ionothermal Methods

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/6443

Title:	利用水熱和離子熔液法合成鑭系金屬草酸化合物;The Synthesis of Lanthanide Oxalates by Using Hydrothermal and Ionothermal Methods
Authors:	彭雪芬;Hsueh-Fen Peng
Contributors:	化學研究所
Keywords:	水熱法;鑭系金屬草酸鹽;離子熱法;Hydrothermal;Lanthanide Oxalates;Ionothermal
Date:	2008-06-23
Issue Date:	2009-09-22 10:19:37 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本論文研究利用中溫水熱法和離子熱法合成兩個新穎結構的鑭系金屬草酸化合物： [CH6N][Eu(H2O)(C2O4)2]•2H2O (A) [C13H28N2][LnZn(C2O4)3.5]•H2O [ Ln = Er (B1) 和 Tm (B2) ] 以上所列之化合物均能得到單晶，利用單晶X-光繞射儀決定結構及化學式，以粉末X-光繞射分析確定產物的純度與元素分析確定化合物中C、H和N元素比例，藉由熱重分析研究化合物的熱性質和紅外線光譜進行結構組成分析，並利用超導量子干涉儀測量化合物的磁性現象。化合物A是以中溫水熱法合成，結構中只有一種配位環境的Eu3+，為九配位，由六個草酸根交替連接六個銪氧多面體形成蜂巢型的層狀結構，再經由垂直方向的草酸根同樣以雙邊雙螯的方式連接層與層，進而形成具有12圓環的三維骨架結構，有機胺陽離子和水分子座落於孔道間。 B系列的兩個化合物互為等結構化合物，以離子熱法合成。其結構由LnO8多面體以草酸單元相互連接形成鋸齒型長鏈，再由ZnO6三角錐以草酸作為架橋連接相鄰的兩條長鏈，進而形成二維層狀結構，最後由鋅離子與垂直平面方向的草酸根配位形成具有8圓環和16圓環的三維骨架，有機胺陽離子和水分子填充於隧洞中。結構中的草酸根皆是以雙邊雙螯的方式連接金屬。B系列化物除去結晶水後結構保持完整，具有良好的熱穩定性。 Three metal oxalates compounds, [CH6N][Eu(H2O)(C2O4)2]•2H2O (A) and [C13H28N2][LnZn(C2O4)3.5]•H2O [ Ln = Er (B1) 和 Tm (B2) ], were synthesized by hydrothermal and ionothermal methods and structurally characterized by single-crystal X-ray diffraction, thermogravimetric analysis, and magnetic susceptibility. In A, the linkages between the Eu3+ and oxalate units give rise to layered architecture with 12-membered (6 Eu and 6 oxalates) honeycomblike apertures wherein the amine and water molecules are located. The Eu-oxalate layers are cross-linked by another oxalate unit giving rise to a three- dimensional structure . Both B1 and B2 comprise LnO8 decahedra, ZnO6 trigonal prism and oxalate anions forming 2-D layers which connected via bisbidentate oxalate anions to form a 3-D framework, and delimit 8- and 16-membered ring channels alone a axis. B1 and B2 are thermally stable up to 300℃. The series B are the first 3D 3d-4f heterometallic oxalates under ionothermal conditions.
Appears in Collections:	[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

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