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New fluorescent polarization method to evaluate the orientation of adsorbed molecules in uniaxial 2D layered materials

Paper ID Volume ID Publish Year Pages File Format Full-Text
29113 44122 2006 6 PDF Available
Title
New fluorescent polarization method to evaluate the orientation of adsorbed molecules in uniaxial 2D layered materials
Abstract

A new fluorescence polarization method is developed as a powerful tool to evaluate the preferential orientation of Rhodamine 6G (R6G) molecules adsorbed in the two-dimensional (2D) interlayer space of Laponite (Lap) clay films. The fluorescence anisotropy of a very low R6G loading film, around the 0.1% of the total cation exchange capacity (% CEC) of Lap, reveals that the dye is adsorbed as monomeric units with a preferential orientation angle of 62° with respect to the normal to the clay layers. This tilted angle agrees with that previously obtained by absorption spectroscopy with linearly polarized light [V. Martínez Martínez, F. López Arbeloa, J. Bañuelos Prieto, I. López Arbeloa, Chem. Mater. 17 (2005) 4134–4141], justifying the validity of the present emission technique. The fluorescent method can be applied to evaluate the orientation of any fluorescent molecules preferentially adsorbed along the normal of the plane of any rigid 2D host arrays.

Keywords
Dye adsorption; Clay thin; Anisotropy; Fluorescent polarization
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New fluorescent polarization method to evaluate the orientation of adsorbed molecules in uniaxial 2D layered materials
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 181, Issue 1, 5 July 2006, Pages 44–49
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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