多重掺杂的纳米结构硅酸盐溶胶-凝胶薄膜：掺杂剂的空间分离、能量转移及距离测量

Multiply doped nanostructured silicate sol-gel thin films: spatial segregation of dopants, energy transfer, and distance measurements.

作者信息

Minoofar Payam N, Dunn Bruce S, Zink Jeffrey I

机构信息

Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, USA.

出版信息

J Am Chem Soc. 2005 Mar 2;127(8):2656-65. doi: 10.1021/ja045185e.

DOI:10.1021/ja045185e

PMID:15725023

Abstract

Physical and chemical strategies that place designed molecules in spatially separated regions of surfactant-templated mesostructured silicate thin films are used to prepare films containing rhodamine 6G (R6G), lanthanide complexes, and both simultaneously. Fluorescence and photoexcitation spectra of R6G in amorphous and structured thin films show that it is located inside the surfactant micelles of structured thin films. A silylated ligand that binds lanthanides condenses to form part of the silica framework and causes the lanthanide to localize in the silica. Luminescence and photoexcitation spectra show that energy transfer from the metal complex to R6G occurs in the films. R6G quenches Tb emission in a concentration-dependent manner. Energy transfer efficiency is calculated using the Tb luminescence lifetime, and this quantity is used to calculate the distance between Tb and R6G with the aid of Forster theory.

摘要

将设计好的分子置于表面活性剂模板化介孔结构硅酸盐薄膜的空间分离区域的物理和化学策略，被用于制备包含罗丹明6G（R6G）、镧系元素配合物以及两者同时存在的薄膜。非晶态和结构化薄膜中R6G的荧光和光激发光谱表明，它位于结构化薄膜的表面活性剂胶束内部。一种与镧系元素结合的硅烷化配体缩合形成二氧化硅骨架的一部分，并使镧系元素定位于二氧化硅中。发光和光激发光谱表明，在薄膜中发生了从金属配合物到R6G的能量转移。R6G以浓度依赖的方式猝灭Tb的发射。利用Tb发光寿命计算能量转移效率，并借助福斯特理论用该量计算Tb与R6G之间的距离。