The synthesis and complexation of novel azosubstituted calix[4]arenes and thiacalix[4]arenes

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• 作者：Kamil Lang ; Petra Proš ; ková ; Jan Kroupa ; Ji&#x159 ; í ; Morá ; vek ; Ivan Stibor ; Michaela Pojarová ; ; Pavel Lhotá ; k
• 关键词：Calix[4]arene ; Thiacalix[4]arene ; Alkylation ; Cation complexation ; UV– ; vis titration
• 刊名：Dyes and Pigments
• 出版年：2008
• 期刊代码：31_01437208
• 类别：ms
• 出版时间：2008
• 卷：77
• 期：3
• 页码：646-652
• 文件大小：438 K

摘要

Novel calix[4]arene/thiacalix[4]arene derivatives bearing arylazo moieties were prepared via a diazo-coupling reaction. Subsequent alkylation with ethyl bromoacetate via the template effect of alkali metal carbonates resulted in arylazo substituted calix[4]arene/thiacalix[4]arene tetraacetates. UV–vis spectroscopy revealed that in terms of their binding affinity towards alkali metal cations, the tetraacetate derivative displayed considerable selectivity for sodium cations (ration:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TFY-4PR3GBR-1&_mathId=mml1&_user=10&_cdi=5239&_rdoc=23&_acct=C000050221&_version=1&_userid=10&md5=ed334f57b53f8727132b86a5d9d7c1b6" title="Click to view the MathML source">K_Na⁺/K_K⁺>100, ration:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TFY-4PR3GBR-1&_mathId=mml2&_user=10&_cdi=5239&_rdoc=23&_acct=C000050221&_version=1&_userid=10&md5=c606b301f041a53df5323be88f363546" title="Click to view the MathML source">K_Na⁺/K_Li⁺>175).