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Donor–π–acceptor (D–π–A) dyad for ratiometric detection of Hg2+ and PPi†
New Journal of Chemistry ( IF 3.3 ) Pub Date : 2018-06-21 00:00:00 , DOI: 10.1039/c8nj00741a
Richa Rani 1, 2, 3, 4 , Gulshan Kumar 1, 2, 3, 4 , Kamaldeep Paul 1, 2, 3, 4 , Vijay Luxami 1, 2, 3, 4
Affiliation  

A donor–π–acceptor (D–π–A) dyad 1 has been successfully synthesized by linking phenanthrenequinone as an electron donor unit and anthraquinone as an electron acceptor unit through a phenyl ring. Dyad 1 exhibits intramolecular charge transfer and this is a key factor for the detection of Hg2+ and of the pyrophosphate ion (P2O74−, PPi) in a semi-aqueous medium. Dyad 1 exhibits absorption peaks at 430, 370, and 337 nm and an emission peak at 530 nm (λex = 430 nm). Dyad 1 exhibits a new absorption peak at 390 nm ratiometrically along with emission quenching in the presence of Hg2+ ions while the presence of PPi results in drastic ratiometric changes in the absorption and emission spectra with new peaks at 495 nm and 620 nm, respectively. The quantum yield of dyad 1 on complexation with PPi was also increased from 0.1 (free dyad) to 0.69 (dyad 1·PPi). The lowest detection limits for Hg2+ and PPi were found to be 31 nM and 46.5 nM, respectively. DFT calculations have been performed to develop a mechanism for PPi and Hg2+ ion binding with dyad 1.

中文翻译:

供体–π–受体(D–π–A)二元组,用于比例检测Hg 2+和PPi

通过苯基环连接作为电子供体单元的菲醌和作为电子受体单元的蒽醌,已成功合成了供体-π-受体(D-π-A)二元化合物1。Dyad 1表现出分子内电荷转移,这是检测半水介质中Hg 2+和焦磷酸根离子(P 2 O 7 4-,PPi)的关键因素。成对层1分在430,370和337nm处显示出吸收峰和在530nm的发射峰(λ EX = 430纳米)。在存在Hg 2+的情况下,二元组1在390 nm处按比例显示出新的吸收峰以及发射猝灭离子,而PPi的存在会导致吸收光谱和发射光谱发生剧烈的比率变化,分别在495 nm和620 nm处出现新的峰。与PPi络合时,二元组1的量子产率也从0.1(游离二元组)增加到0.69(二元组1 ·PPi)。发现Hg 2+和PPi的最低检测限分别为31 nM和46.5 nM。已进行DFT计算,以开发PPi和Hg 2+离子与dyad 1结合的机制。
更新日期:2018-06-21
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