Fluorescence excitation and emission spectra of 1,5-dihydroxyanthraquinone-d2 in n-hexane at 10 K

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Abstract
The fluorescence excitation, between 430 and 505 nm, and emission, between 505 and 725 nm, spectra in n-hexane of 1,5-dihydroxyanthraquinone-d0 and -d2 at 10 K have been measured. Dual excitation and emission associated to excited state proton transfer were observed. Apart from the long wavelength emission, well resolved vibrational structures were obtained. A remarkable spectral shift (684 cm−1) of the origin of the high frequency transition was observed upon deuteration. The energy gaps between the transition origins both in excitation and emission as well as the isotopic shifts of the origins, were interpreted in terms of Lippincott–Schroeder asymmetric double minimum potential functions along the OH coordinate. An extra fluorescence occurs in the low frequency range, vanishing upon deuteration. It was explained as due to the ν(OH) stretching mode of the high frequency emission enhanced via vibronic coupling between the two ground states.

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