Indicated that the model proposed by Kuhn is appropriate for the two dyes with less polarizableĮnd groups, 1,1’ diethyl-4,4’-carbocyanine iodide and 1,1’-diethyl-4,4’-cyanine iodide, but required Recorded and compared to the predicted wavelength of maximum absorbance. The wavelength of maximum absorbance is analyzed. In this experiment, the suitability of a simplified model of a particle-in-a-box to predict The highly conjugated system of cyanine dyes makes these compounds good candidatesįor labeling of biomacromolecules for diagnostic purposes or for the development of more efficient Polymethine carbocyanine dyes can have applications ranging from the development of solar cells and heat absorbers to use as labels for biomacromolecules such as DNA and protein. Carbocyanine dyes contain variable length chains of methine carbons and two heterocycles that can act both as electron donors and as electron acceptors. Introduction: The highly conjugated electron system in polymethine dyes allows these compounds to absorb light in the visible region of the electromagnetic spectrum. Kuhn’s free electron model proved reasonably reliable for this system. General trends such as lower separation between the highest occupied molecular orbital and the lowest unoccupied molecular orbital were observed with increasing conjugation across the two series of dyes, while the series with the more polarizable end groups absorbed higher wavelength light than the corresponding dyes with less polarizable end groups indicating the contribution of the end group to extending the one-dimensional box. The results indicated that the model proposed by Kuhn is appropriate for the two dyes with less polarizable end groups, 1,1’ diethyl-4,4’-carbocyanine iodide and 1,1’-diethyl-4,4’-cyanine iodide, but required the adjustment of an empirical parameter α to 0.675 to provide more reliable predictions for 3,3’-diethylthiatricarbocyanine iodide, 3,3’-diethylthiacyanineiodide, 3,3’-diethylthiacarbocyanine iodide and 3,3’-diethylthiadicarbocyanine iodide. The spectrum of six cyanine dyes was recorded and compared to the predicted wavelength of maximum absorbance. In this experiment, the suitability of a simplified model of a particle-in-a-box to predict the wavelength of maximum absorbance is analyzed. Absorption Spectrum of a Conjugated Dye Abstract: The highly conjugated system of cyanine dyes makes these compounds good candidates for labeling of biomacromolecules for diagnostic purposes or for the development of more efficient solar cells.
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