Cooperative NH⋯O and CH⋯O interactions for sulfate encapsulation in a thiophene-based macrocycle
摘要:
A thiophene-based macrocycle containing four secondary and two tertiary amines has been synthesized and its binding affinity has been investigated toward sulfate anion in solution and solid states. Structural analysis of the sulfate salt suggests that the ligand in its hexaprotonated form is capable of encapsulating one sulfate within the cavity through cooperative NH center dot center dot center dot O and CH center dot center dot center dot O interactions. As investigated by (1)H NMR titrations, the ligand forms a 1:1 complex with sulfate in water at pH 2.1, showing a binding constant (K) of 3200 M(-1). The formation of the complex has been further confirmed by ESI-MS, indicating that the complex can exist in solution with considerable stability. (C) 2010 Elsevier Ltd. All rights reserved.
Fluorescent detection of phosphate anion by a highly selective chemosensor in water
作者:Musabbir A. Saeed、Douglas R. Powell、Md. Alamgir Hossain
DOI:10.1016/j.tetlet.2010.07.078
日期:2010.9
A macrocyclic dinuclear copper complex, [Cu2II(1)Br4]·2H2O has been synthesized and characterized by X-ray crystallography, in which each metalion is pentacoordinated in a square pyramidal environment and the macrocycle is folded to form a boat-shaped empty cavity. As studied by an indicator displacement assay, the dinuclear complex shows strong selectivity for phosphate over sulfate, nitrate, perchlorate
合成了一种大环双核铜配合物 [Cu 2 II ( 1 )Br 4 ]·2H 2 O,并通过 X 射线晶体学表征,其中每个金属离子在四方锥体环境中五配位,大环折叠形成一个船形的空腔。根据指示剂置换试验的研究,在生理 pH 值下,双核复合物对磷酸盐的选择性强于水中的硫酸盐、硝酸盐、高氯酸盐和卤化物。