Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, India.
Inorg Chem. 2009 Dec 7;48(23):11032-7. doi: 10.1021/ic901205c.
The present manuscript reports the synthesis, characterization, and analysis of electronic properties of water-soluble guanosine 5'-monophosphate (GMP)-mediated CdS quantum dots (Q-dots). The morphology, size, and size distribution of these particles have been analyzed by transmission electron microscopy. These particles display the onset of absorption at 2.7 eV and emission at 2.2 eV. In comparison to other monophosphates of RNA (AMP, UMP, and CMP), GMP-mediated CdS exhibits enhanced electronic properties. The participation of different functional groups of GMP in the stabilization of CdS nanoparticles has been analyzed by FTIR and (1)H and (31)P NMR spectroscopic techniques. Two types of binding sites involving phosphorus centers are indicated by IR and (31)P NMR studies. The conversion of CdS Q-dots to nanorods has been monitored by using electron microscopy, steady-state optical and fluorescence measurements, and a fluorescence lifetime system coupled with anisotropy accessories. The observed change in the morphology and electronic behavior of GMP- and RNA-mediated CdS nanostructures is discussed on the basis of their structural difference.
本手稿报告了水溶性鸟苷 5'-单磷酸（GMP）介导的硫化镉量子点（Q-dots）的合成、表征和电子性质分析。通过透射电子显微镜分析了这些颗粒的形态、大小和尺寸分布。这些颗粒在 2.7eV 处显示出吸收起始，在 2.2eV 处显示出发射。与 RNA 的其他单磷酸盐（AMP、UMP 和 CMP）相比，GMP 介导的 CdS 表现出增强的电子性质。通过傅里叶变换红外光谱（FTIR）和（1）H 和（31）P 核磁共振波谱技术分析了 GMP 中不同官能团在稳定 CdS 纳米粒子中的作用。IR 和（31）P NMR 研究表明存在两种涉及磷中心的结合位点。通过电子显微镜、稳态光学和荧光测量以及与各向异性附件耦合的荧光寿命系统监测了 CdS Q-dots 向纳米棒的转化。根据它们的结构差异，讨论了 GMP 和 RNA 介导的 CdS 纳米结构的形貌和电子行为的变化。
