Disentangling the Photophysics of DNA-Stabilized Silver Nanocluster Emitters
Disentangling the Photophysics of DNA-Stabilized Silver Nanocluster Emitters
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DOI：
10.1021/acs.jpcc.6b05363
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发表时间：
2016-10-27
影响因子：
3.7
通讯作者：
Sanchez, Cristian G.
中科院分区：
文献类型：
--
作者：
Berdakin, Matias;Taccone, Martin;Sanchez, Cristian G.
已经确定 DNA 银荧光团呈现两个强吸收带，一个在可见光区，另一个在紫外光谱区，并且两个吸收带的激发都会产生共同的荧光信号。然而，造成这种耦合的详细机制仍然难以捉摸。在这种背景下，我们的工作通过使用时间依赖的密度函数紧束缚方法提供这些系统中光吸收时激发和发生的过程的动态图，是实现这一目标的重大飞跃。在目前的工作中，我们探索了由具有六个碱基的双链脱氧多胞嘧啶和六个银原子棒组成的簇中的电子耦合机制。
It has been already established that DNA silver fluorophores present two intense absorption bands, one in the visible and the other in the UV spectral region, and that the excitation of both bands produces a common fluorescence signal. Nevertheless, the detailed mechanism responsible for this coupling is still elusive. In this context, our work is a significant leap forward in this goal by providing a dynamic picture of the excitation and the processes that take place upon light absorption in these systems using a time-dependent density functional tight-binding approach. In the present work, we explore the electronic coupling mechanism in a cluster composed of a double string of deoxypolycytosine with six bases and a rod of six Ag atoms.