Fluorescent non-linear chiral polymer chemosensor bonded alternatively with 1,4-diethynyl-2,5-dioctyloxybenzene and (R,R)-salen for Zn²⁺recognition

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• 作者：Sekarpandi Sakthivel ; Suribabu Jammi ; Tharmalingam Punniyamurthy ; ^{tpunni@iitg.ernet.in}
• 刊名：Tetrahedron ; Asymmetry
• 出版年：2012
• 期刊代码：108_09574166
• 类别：ch
• 出版时间：31 January, 2012
• 卷：23
• 期：2
• 页码：101-107
• 文件大小：918 K

摘要

Stereoregular non-linear chiral main chain polymers 1a-b bonded alternatively with (R,R)-salen and 1,4-diethynyl-2,5-dioctyloxybenzene moieties have been synthesized using palladium catalyzed C-C cross-coupling and Schiff base formation reactions as the key steps. These polymers are soluble in common organic solvents, and act as an effective chemosensor for the detection of Zn²⁺ with respect to other metal ions with enhanced fluorescence. The CD spectra observed for the polymers 1a-b could be attributed to the helical secondary structure with a low degree of inter-strand interactions. This reduced inter-strand interaction has been ascertained from the titration of pyridine to the Zn(II)-polymer 1b complex, which results in minor changes in the fluorescence emission.