N-（4-氨基-7-硝基苯并恶唑-1,3-二氮杂环戊二烯）取代的氮杂冠醚：与碱金属、碱土金属离子及铵离子的络合作用
N-(4-amino-7-nitrobenzaoxa-1,3-diazole)-substituted aza crown ethers: complexation with alkali, alkaline earth metal ions and ammonium.
作者信息
Mateeva Nelly N, Deiab Shihab D, Archibong Edikan E, Jackson Mercedes, Mochona Bereket, Gangapuram Madhavi, Redda Kinfe K
机构信息
Department of Chemistry, Florida A&M University, 1530 M.L.King, Jr. Blvd, 219 Jones Hall, Tallahassee, FL 32307, USA.
出版信息
J Incl Phenom Macrocycl Chem. 2010 May 7;68(3-4):305-312. doi: 10.1007/s10847-010-9788-2.
Three novel aza-crown ether derivatives incorporating 4-amino-7-nitrobenzaoxa-1,3-diazole (NBD) chromophore were synthesized and their structure confirmed by (1)H-NMR, IR and elemental analysis. The influence of the solvent polarity and protonation on the photophysical properties of NBD-15-crown-5 was studied by UV/Vis and fluorescence methods. The influence of the investigated cations on the absorption spectra of the ligands was negligible, however emission was strongly affected. Complexation and binding stability of NBD-aza-15-crown-5 and NBD-aza-18-crown-6 were studied using fluorescence spectroscopy. NBD-aza-18-crown-6 exhibits strong selectivity toward Ca(2+) and Sr(2+) ions with formation constants about 10(3) times higher than the formation constants with the other ions included in the study.
合成了三种新型的含4-氨基-7-硝基苯并恶唑-1,3-二唑（NBD）发色团的氮杂冠醚衍生物，并通过¹H-NMR、红外光谱和元素分析对其结构进行了确证。采用紫外/可见光谱和荧光光谱方法研究了溶剂极性和质子化对NBD-15-冠-5光物理性质的影响。所研究的阳离子对配体吸收光谱的影响可忽略不计，但对发射光谱有强烈影响。利用荧光光谱研究了NBD-氮杂-15-冠-5和NBD-氮杂-18-冠-6的络合作用和结合稳定性。NBD-氮杂-18-冠-6对Ca²⁺和Sr²⁺离子表现出很强的选择性，其形成常数比研究中包含的其他离子的形成常数高约10³倍。
Zotero 插件