Binding induced destruction of an excimer in anthracene-linked benzimidazole diamide: a case toward the selective detection of organic sulfonic acids and metal ions
作者:Kumaresh Ghosh、Tanushree Sen、Amarendra Patra
DOI:10.1039/b9nj00789j
日期:——
A simple anthracene-linked benzimidazole diamide, 1, has been designed and synthesized. 1 was found to undergo a subtle change in conformation, followed by destruction of the inherently present excimer in the presence of organic sulfonic acids and selective metal ions. Destruction of the excimer did not take place in the presence of carboxylic acids and even stronger trifluroacetic acid. This finding was taken as a possible tool for distinguishing organic sulfonic acids from carboxylic acids. A similar situation arose in the presence of Cu2+, Co2+ and Ni2+, among the other metal ions studied, and the cleft was selective for Cu2+. The binding interaction was followed using 1H NMR, UV-vis and fluorescence spectroscopic methods.
我们设计并合成了一种简单的蒽连苯并咪唑二酰胺 1。研究发现,在有机磺酸和选择性金属离子存在的情况下,1 的构象会发生微妙的变化,随后固有的准分子会被破坏。在羧酸和更强的三氟乙酸存在时,准分子不会被破坏。这一发现被认为是区分有机磺酸和羧酸的可能工具。在研究的其他金属离子中,Cu2+、Co2+ 和 Ni2+ 存在时也会出现类似情况,裂隙对 Cu2+ 具有选择性。使用 1H NMR、UV-vis 和荧光光谱方法跟踪了这种结合相互作用。