Selenacalix[3]triazines: Anion Versus Proton Association
作者:Wim Van Rossom、Joice Thomas、Tatyana G. Terentyeva、Wouter Maes、Wim Dehaen
DOI:10.1002/ejoc.201201548
日期:2013.4
preorganization of three electrondeficient triazine rings allows for anions to bind through anion-π interactions, and alignment of the central nitrogen lone pairs and the well-defined size of the macroring enable association with a single proton. Extended UV/Vis titration studies indicated a clear difference in complexation behavior depending on the outer-rim substitutionpattern. The host–guest properties
Selenacalix[3]triazines 是一种在杂芳基成分之间具有直接 Se 键的环三聚元环芳烃,被证明与各种客体物种相关联。三个缺电子三嗪环的预组织允许阴离子通过阴离子-π 相互作用结合,并且中心氮孤对的排列和大环的明确定义的大小能够与单个质子结合。扩展的 UV/Vis 滴定研究表明,根据外缘替代模式,络合行为存在明显差异。发现类似的硒和硫杯[3]三嗪的主客体特性明显不同。
Synthetic Protocols towards Selenacalix[3]triazines
作者:Wim Dehaen、Joice Thomas、Wim Van Rossom、Kristof Van Hecke、Luc Van Meervelt、Mario Smet
DOI:10.1055/s-0032-1318265
日期:——
Selenium-bridged heteracalixarenes were synthesized by convenient one-pot SNAr reactions starting from variously 2-substituted 4,6-dichloro-1,3,5-triazine building blocks. Reactions of these precursors with sodium hydroselenide afforded the selenacalix[3]triazines as the only macrocyclic products. Yields of the cyclotrimers were significantly increased by optimization of the macrocyclization conditions, the optimum parameters being dependent on the triazine functionalization pattern. X-ray diffraction studies allowed unambiguous identification of the structures and comparison with the solid-state features of analogous heteracalixarenes.
Selenacalix[3]triazines: synthesis and host–guest chemistry
作者:Joice Thomas、Wim Van Rossom、Kristof Van Hecke、Luc Van Meervelt、Mario Smet、Wouter Maes、Wim Dehaen
DOI:10.1039/c1cc15473g
日期:——
The heteracalixarene series (N/O/S) has been expanded with Se-bridged cyclotrimeric macrocycles. Selenacalix[3]triazines were synthesized by convenient one-pot nucleophilic aromatic substitution reactions and they showed peculiar supramolecular features. The N tridentate binding pocket was capable of coordinating both copper ions and anions.