The Synthesis of Lanthanide Oxalates by Using Hydrothermal and Ionothermal Methods

• Main Authors: Hsueh-Fen Peng, 彭雪芬
• Other Authors: Kwang-Hwa Lii
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/56942342130337852648

碩士 === 國立中央大學 === 化學研究所 === 96 === 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.