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Anionic uranyl ion complexes with pyrazinetetracarboxylate: Influence of structure-directing cations

Pierre Thuéry 1 Jack Harrowfield 2 
1 LCMCE - Laboratoire de Chimie Moléculaire et de Catalyse pour l'Energie (ex LCCEF)
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : Pyrazine-2,3,5,6-tetracarboxylic acid (H4PZTC) has been used to synthesize three uranyl ion complexes under solvo-hydrothermal conditions and in the presence of additional cations as structure-directing agents. The complex [C(NH2)3]2[UO2(PZTC)]⋅2H2O (1) displays double ONO-chelation of uranyl, resulting in the formation of a monoperiodic coordination polymer, further association being provided by guanidinium and water hydrogen bonding. The PZTC4– ligand in [Co(en)3][UO2(PZTC)](NO3)⋅H2O (2) is bound to three uranyl cations, one of them ONO-chelated and the others bound to monodentate carboxylate donors, and the polymer formed is triperiodic with the ths topology. The ONO sites in the heterometallic complex [UO2Ag2(PZTC)] (3) are occupied by Ag+ cations, further carboxylate bonding to uranyl and Ag+ cations, as well as oxo bonding of uranyl to Ag+, resulting in the formation of an intricate triperiodic framework in which uranyl cations and PZTC4– alone give a triperiodic polymer with the lvt topology displaying double interpenetration, the Ag+ cations connecting the two networks into a single assembly.
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Submitted on : Monday, October 17, 2022 - 5:07:27 PM
Last modification on : Wednesday, October 19, 2022 - 3:55:38 AM



Pierre Thuéry, Jack Harrowfield. Anionic uranyl ion complexes with pyrazinetetracarboxylate: Influence of structure-directing cations. Polyhedron, 2022, 227, pp.116118. ⟨10.1016/j.poly.2022.116118⟩. ⟨cea-03818244⟩



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