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A three-dimensional metal-organic framework with cation-cation interactions, UO(2)(NO(2)TA)(2)(H(2)O) (1), was synthesized hydrothermally and characterized via single-crystal X-ray diffraction, powder X-ray diffraction, UV-vis spectroscopy, and fluorescence spectroscopy (NO(2)TA = 2-nitroterephthalic acid). 1 crystallizes in the monoclinic space group P2(1)/n [a = 11.6970(7) Å, b = 15.1449(9) Å, c = 12.2564(8) Å, and β = 109.193(1)°] and contains U(2)O(13) dimers. The UV-vis spectrum of 1 contains peaks attributable to both the ligand and the uranium cation. Furthermore, the ligand and the uranium cation of 1 can be independently excited, giving rise to two different luminescent spectra.

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