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The spectroscopic properties of two uranyl crown ether complexes, [UO2(18-crown-6)]2+ and [UO2(dicyclohexano-18-crown-6)]2+, dissolved in acetonitrile and propylene carbonate were studied. UV/VIS and magnetic circular dichroism (MCD) spectra were recorded, as well as emission and excitation spectra. The inclusion complexes formed, have a distorted D3d symmetry, which is common for a crown ether ring, coordinated with a central metal ion. The electronic transitions and vibrational progressions are identified in a D∞h, D3d and D3 distortion scheme. Relaxation of the selection rules by vibronic coupling with the fundamental vibrations of uranyl is discussed.
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Houwer et al. (2003) studied this question.
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