A novel crown ether-acylhydrazone turn-on fluorescent chemosensor for Al3+ ion
作者:Qing Zhang、Qiyue Jiao、Qiang Zhang、Zizhong Liu
DOI:10.1016/j.saa.2018.11.040
日期:2019.3
A novelfluorescentchemosensor based on crown ether-acylhydrazone (L) was synthesized and characterized. The sensor L exhibited high selectivity and sensitive recognition towards Al3+ through a significant “turn-on” fluorescence response at 444 nm in methanol solution. While, other competitive ions had no such significant effects on the fluorescence emission. The associated spectra behavior might
基于冠醚-酰腙(A新颖荧光化学传感器大号)的合成和表征。传感器L通过在甲醇溶液中在444 nm处发生明显的“开启”荧光响应,表现出对Al 3+的高选择性和灵敏识别。同时,其他竞争离子对荧光发射没有显着影响。相关的光谱行为可能归因于2:1 L -Al 3+络合物的形成, 并且建议的L -Al 3+结合模式通过荧光滴定曲线,Job's图,ESI-MS光谱法1证明。1 H NMR滴定和IR分析。除了光信号的高再现性外,还计算出0.24μM的极低检测限。L -Al 3+络合物的缔合常数(K s)约为5.56×10 9 ±8.19×10 7 M -2。各种实验的结果表明,传感器L通过抑制C N异构化和激发态分子内质子转移(ESIPT)过程以及激活螯合增强荧光(CHEF)来遵循开启机制。还使用DFT / B3LYP方法进行了理论计算,以深入了解L的感应机理和电子结构。L可以被认为是测定Al 3+的一种有效且实用的荧光化学传感器。
Benzoaza-15-crown-5 ethers: synthesis, structure, and complex formation with metal and ethylammonium ions
作者:A. I. Vedernikov、S. N. Dmitrieva、L. G. Kuz’mina、N. A. Kurchavov、Yu. A. Strelenko、J. A. K. Howard、S. P. Gromov
DOI:10.1007/s11172-009-0127-y
日期:2009.5
Benzoaza-15-crown-5 ethers containing one or two nitrogen atoms in different positions of the macrocycle and bearing different substituents at these atoms were synthesized. The structures of azacrown ethers and their metal complexes were studied by X-ray diffraction. The stability constants of the complexes of azacrown ethers with Na+, Ca2+, Ba2+, Ag+, Pb2+, and EtNH3+ ions were determined by 1H NMR
anedione (20). A single crystal X-ray diffraction analysis of the 18-crown-6-dipyrrolylquinoxaline 1 revealed that this molecule forms a tetramer centered around a single molecule of water, with no fewer than 10 hydrogen bonds holding the supramolecular structure together. In the case of the 15-crown-5-dipyrrolylquinoxaline 2, however, X-ray diffraction analysis revealed that this species exists as
Voltammetric Studies of Through-Space and Through-Bond Electrostatic Interactions in Alkyl Linked Ferrocene and Benzoaza-15-crown-5 Receptor Molecules in Acetonitrile
作者:Shan Jin、Xianbo Jin、Dihua Wang、Gongzhen Cheng、Ling Peng、George Z. Chen
DOI:10.1021/jp044149z
日期:2005.6.1
-(CH2)2- but positively from -(CH2)2- to -(CH2)4-. This unusual variation is attributed to the combined electron donating and withdrawing influences and also the steric effect from the substituents on the ferrocene moiety. Analyses of the potentials of the molecules and their fully protonated forms suggested intramolecular electrostatic signaling through not only the space but also the alkyl chain which
Synthesis, Biological Evaluation, and Molecular Modeling of Aza-Crown Ethers
作者:Stepan S. Basok、Igor A. Schepetkin、Andrei I. Khlebnikov、Anatoliy F. Lutsyuk、Tatiana I. Kirichenko、Liliya N. Kirpotina、Victor I. Pavlovsky、Klim A. Leonov、Darya A. Vishenkova、Mark T. Quinn
DOI:10.3390/molecules26082225
日期:——
calculations were performed on five structure-related diaza-crown ethers and their complexes with Ca2+, Na+, and K+ to obtain a set of molecular electronic properties and to correlate these properties with biological activity. According to density-functional theory (DFT) modeling, Ca2+ ions were more effectively bound by these compounds versus Na+ and K+. The DFT-optimized structures of the ligand-Ca2+ complexes