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Polarized Normal-Incidence Cavity Ring-Down Spectroscopy: Probing Spiropyran Photochromism in Thin PMMA Films and Toluene

Polarized Normal-Incidence Cavity Ring-Down Spectroscopy: Probing Spiropyran Photochromism in Thin PMMA Films and Toluene

Jordan H Mantha, Ali I Ismail, Joseph I Cline

J Phys Chem A. 2011 Feb 3;115(4):410-8.

PMID: 21210692

Abstract:

A normal-incidence geometry, polarization-resolved cavity ring-down spectroscopy technique (polarized NICRDS) is described to probe the polarized absorbance of surface-adsorbed thin films and short-path length liquid samples. The technique is demonstrated by a kinetic study of the photochromic behavior of the spiropyran dye 6,8-dibromo-1', 3'-dihydro-1', 3', 3'-trimethylspiro[2H-1-benzopyran-2, 2'-(2H)-indole]. The technique is shown potentially to have monolayer coverage sensitivity and can measure the angular orientation distribution of analyte molecules. The photochromic kinetics of 6,8-dibromoBIPS in toluene solution were qualitatively consistent with a previous study of this molecule using conventional absorption spectroscopy. The absorption polarizations and slow ring-closing kinetics measured in a thin poly(methyl methacrylate) film are consistent with a strong interaction of the spiropyran and merocyanine forms with the polymer matrix.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1498880	1′,3′-Dihydro-1′,3′,3′-trimethyl-6-nitrospiro[2H-1-benzopyran-2,2′-(2H)-indole]		1498-88-0	Price

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