Armed-azacrown ethers having dual binding sites in a side arm: Complexing abilities and crystal structure of two alkali-metal complexes
作者:Yoichi Habata、Tomomi Saeki、Sadatoshi Akabori、Xian X. Zhang、Jerald S. Bradshaw
DOI:10.1002/jhet.5570380137
日期:2001.1
New armed-monoaza-12-crown-4 and armed-monoaza-15-crown-5 ethershavingdual phenolic OH and pyridine nitrogen bindingsites in a sidearm were prepared by the Mannich reaction of N-methoxymethyl-monoazacrown ethers with 3-hydroxypyridine. Complexation studies of these new hydroxypyridine-armed ligands were carried out by liquid membrane transport, 1H nmr titration experiments, thermodynamic values
通过N-甲氧基甲基单氮杂ac烯醚与3-甲氧基甲基单氮杂az烯醚的曼尼希反应,制备了在侧臂具有双酚羟基和吡啶氮结合位点的新型武装单氮杂-12-冠-4和武装单氮杂-15-冠-5醚。羟基吡啶。通过液膜传输,1 H nmr滴定实验,热力学值(log K,ΔH和TΔS)以及两种碱金属络合物的X射线晶体学研究,对这些新的羟基吡啶武装的配体进行了络合研究。这些结果表明,在碱性和中性条件下,酚OH基团的氧原子和侧臂的吡啶氮原子分别参与络合。
Preparation of<i>N</i>-(4′,6′-difluoro-2′-hydroxybenzyl)-monoaza-15-crown-5 and x-ray crystal structure of potassium thiocyanate complex: A molecular partition wall
作者:Yoichi Habata、Sadatoshi Akabori
DOI:10.1002/jhet.5570380226
日期:2001.3
interesting, because it has two possible bindingsites (phenolic OH group and fluorine atom) in the sidearm. An X-ray crystalstructure of the potassium thiocyanate complex of ligand 2 revealed that the oxygen atom of the phenolic OH group binds to the potassium cation incorporated in the crown ether ring, and two water molecules are enclosed by two armed crown ethers with the crown ethers forming partition
Polymer-like complexes bridged by a fluorine substituent of the side arm in the 3′,5′-difluoro-4′-hydroxybenzyl-armed monoaza-15-crown-5 ether
作者:Yoichi Habata、Tomomi Saeki、Sadatoshi Akabori、Xian X. Zhang、Jerald S. Bradshaw
DOI:10.1039/b003451g
日期:——
3â²,5â²-Difluoro-4â²-hydroxybenzyl-armed
monoaza-15-crown-5 ethers which form fluorine-bridged polymer-like
complexes with MSCN in the solid state and in solution are reported.