报告题目：Phase Transition Materials of Dipyridylamide-Based Coordination Frameworks

　　报告人：Biing-Chiau Tzeng (曾炳墝) 教授 台湾国立中正大学

　　报告时间：2014年4月2日（星期三）9:30

　　报告地点：生物医药与先进材料研究中心大报告厅

　　报告内容：
　　A 1-D double-zigzag (DZ) framework, {[Zn(paps)2(H2O)2](ClO4)2}n (1) (paps = N,N'-bis(pyridylcarbonyl)-4,4'-diaminodiphenyl thioether), was synthesized by the reaction of Zn(ClO4)2 with paps. However, a similar reaction, except that dry solvents were used instead, led to the formation of a novel 2-D polyrotaxane (PR) framework, [Zn(paps)2(ClO4)2]n (2). The above difference relies on the fact that water coordinates to the Zn(II) ion in 1, but ClO4- anion coordination is found in 2. Notably, both structures can be interconverted by heating and grinding in the presence of moisture, and such structural transformation can also be proven experimentally by powder and single-crystal X-ray diffraction studies. Significantly, the bright emission for the DZ framework of 1 and the weak one for the PR framework of 2 can also show interesting mechanochromic luminescence. The related papo (papo = N,N'-bis(pyridylcarbonyl)-4,4'- diaminodiphenyl ether) and papc (papc = N,N'-(methylenedi-p-phenylene)-bispyridine-4- carboxamide) ligands were used to react with Zn(ClO4)2 as well and their results were compared with those of paps. In addition, hybrid-ligand, anion, and metal effects have also been examined for such interesting behavior.

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曾炳墝.doc