Oregon Health & Science University Quantum Chemistry Lab Report

By measuring fluorescence intensity as a function of quencher concentration, [Q],at fixed surfactant concentration, [S], we can find the average number of
molecules of S per micelle if we know the critical micelle concentration (which is
independently measured in solution of S). The Table gives data for 3.8 um
pyrene in a micellar solution with a total concentration of sodium dodecyl sulfate
[S] = 20.8 mm.
Calculate the average number of sodium dodecyl sulfate, N, if the critical
micelle concentration is 8.1 mm.
a) Using particle in a box model, calculate the wavelength light required to induce
a transition from the ground state to the first excited state for butadiene molecule.
To calculate the length of the box, assume that the molecule is linear and use
154 pm and 135 pm for C-C and C = C bond lengths respectively.
b) From the absorption spectrum of conjugated dye investigated, the wavelength
of maximum absorption increases with increasing conjugation. Explain this using
the equation of particle in a box model.

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