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Analytical Chemistry Insights

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The Effect of Varying Short-Chain Alkyl Substitution on the Molar Absorptivity and Quantum Yield of Cyanine Dyes

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Publication Date: 23 Mar 2011

Type: Original Research

Journal: Analytical Chemistry Insights

Citation: Analytical Chemistry Insights 2011:6 29-36

doi: 10.4137/ACI.S6568

Abstract

The effect of varying short-chain alkyl substitution of the indole nitrogens on the spectroscopic properties of cyanine dyes was examined. Molar absorptivities and fluorescence quantum yields were determined for a set of pentamethine dyes and a set of heptamethine dyes for which the substitution of the indole nitrogen was varied. For both sets of dyes, increasing alkyl chain length resulted in no significant change in quantum yield or molar absorptivity. These results may be useful in designing new cyanine dyes for analytical applications and predicting their spectroscopic properties.


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