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包含在三（对苯二氧基）环三磷腈（TPP）中的双环[1.1.1]戊烷/托兰基分子棒的时间分辨荧光各向异性

Time-Resolved Fluorescence Anisotropy of Bicyclo[1.1.1]pentane/Tolane-Based Molecular Rods Included in Tris(-phenylenedioxy)cyclotriphosphazene (TPP).

作者信息

Cipolloni Marco, Kaleta Jiří, Mašát Milan, Dron Paul I, Shen Yongqiang, Zhao Ke, Rogers Charles T, Shoemaker Richard K, Michl Josef

机构信息

Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic , Flemingovo nám. 2, 16610 Prague, Czech Republic.

Department of Chemistry and Biochemistry and Department of Physics, University of Colorado , Boulder, Colorado 80309, United States.

出版信息

J Phys Chem C Nanomater Interfaces. 2015 Apr 23;119(16):8805-8820. doi: 10.1021/acs.jpcc.5b01960. Epub 2015 Mar 19.

DOI:10.1021/acs.jpcc.5b01960
PMID:25937858
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4415047/
Abstract

We examine the fluorescence anisotropy of rod-shaped guests held inside the channels of tris(-phenylenedioxy)cyclotriphosphazene (TPP) host nanocrystals, characterized by powder X-ray diffraction and solid state NMR spectroscopy. We address two issues: (i) are light polarization measurements on an aqueous colloidal solution of TPP nanocrystals meaningful, or is depolarization by scattering excessive? (ii) Can measurements of the rotational mobility of the included guests be performed at low enough loading levels to suppress depolarization by intercrystallite energy transfer? We find that meaningful measurements are possible and demonstrate that the long axis of molecular rods included in TPP channels performs negligible vibrational motion.

摘要

我们研究了包裹在三（对苯二氧基）环三磷腈（TPP）主体纳米晶体通道内的棒状客体的荧光各向异性，通过粉末X射线衍射和固态核磁共振光谱对其进行了表征。我们探讨了两个问题：（i）对TPP纳米晶体的水性胶体溶液进行光偏振测量是否有意义，或者散射引起的去极化是否过大？（ii）能否在足够低的负载水平下测量所包含客体的旋转迁移率，以抑制微晶间能量转移引起的去极化？我们发现有意义的测量是可行的，并证明TPP通道中包含的分子棒的长轴振动运动可忽略不计。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2f6a/4415047/82c1d3f52b1b/jp-2015-019605_0002.jpg
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