Lanthanide luminescent switches: modulation of the luminescence of bis-macrocyclic based Tb(iii) conjugates in water by H+, Na+ and K+
作者:Thorfinnur Gunnlaugsson、Joseph P. Leonard
DOI:10.1039/b509230m
日期:——
cationic Tb(III) complexes, Tb·1, Tb·2, and neutral complexes Tb·3 and Tb·4 are described. The effect on the ground, singlet excited states and the Tb(III) emission, was investigated either as a function of pH or the concentration of several Group I and II cations, upon excitation at 300 nm. The ground state and singlet excited states of the Tb(III) complexes were found to be modulated by ions such as
由diaza-15-crown-5偶联制得的四种双大环共轭物 醚(1和3)和diaza-18-crown-6醚(2和4)到酰胺 或羧酸盐官能化的环素(1,4,7,10-四氮杂环十二烷)及其相应的阳离子Tb(III)配合物Tb · 1,Tb · 2和中性配合物Tb · 3和Tb · 4进行了描述。研究了对地面,单重态激发态和Tb(III)发射的影响,它是pH值的函数,还是几种I和II组浓度的函数阳离子在300 nm激发时。发现Tb(III)配合物的基态和单态激发态被诸如H +,Na +或K +等离子所调节,这表明它们被氢键识别。冠醚受体。在pH低于4的酸性介质中,Tb(III)发射对pH高度敏感,随着发光增强的大数量级逐渐增加。对于Tb · 1和Tb · 2配合物,在pH高于8的碱性介质中,Tb(III)的发射也被“打开”。在pH 7.4时,Na +或K +的识别也引起了Tb · 1和Tb ·