Synthesis, Structure, and Spectral Properties of Mixed Uranyl Hydroxonitrate Complexes [(CH_3)_4N]_2[(UO_2)_2(NO_3)_4(OH)_2] and (HMeIm)_2[(UO_2)_2(NO_3)_4(OH)_2] (MeIm = 1-Methylimidazole)

摘要

The structure and spectroscopic properties of two mixed-ligand uranyl complexes, [(CH_3)_4N]_2· [(UO_2)_2(NO_3)_4(OH)_2] and [(UO_2)_2(NO_3)_4(H_2O)_2]·2Im (Im = imidazole), were studied by single crystal X-ray diffraction and by vibrational and photoluminescence spectroscopy. The previously made assumption that the latter compound contains electrically neutral complexes [(UO_2)_2(NO_3)_4(H_2O)_2] was found to be erroneous; actually both compounds contain dimeric anions [(UO_2)_2(NO_3)_4(OH)_2]~(2-).