Synthesis and characterisation of a trinuclear uranyl complex: Crystal structure of (CN3H6)5[(UO2)3O(OH)2(CH3COO)(C2O4)3] |
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| Authors: | Anna V Vologzhanina Larisa B Serezhkina Viktor N Serezhkin |
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| Institution: | a Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 119991 Moscow, Russia
b Samara State university, 443011 Samara, Russia |
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| Abstract: | The reaction of uranyl oxalate trihydrate with guanidinium acetate at room temperature in water yields known uranyl complex with composition (CN3H6)2UO2(C2O4)2(H2O)]·H2O as a first phase and a novel complex (CN3H6)5(UO2)3O(OH)2(CH3COO)(C2O4)3] as a second. The second phase was investigated by means of IR spectroscopy and X-ray diffraction. The trinuclear discrete complex contains two symmetrically independent uranyl ions with a pentagonal bipyramid structure and has a nonplanar geometry. The distortion of its equatorial plane is caused by substitution of a monodentate bridge hydroxide anion by a bidentate bridge acetate-anion. The acidic ligands found in the complex are usually in competition for a place in coordination sphere of an uranyl ion, thus peculiarities of the complex formation are discussed in terms of ‘crystallochemical analysis’. |
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| Keywords: | Heteroligand uranyl complexes Crystallochemical notation |
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