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1,3-Adamantanedicarboxylate and 1,3-Adamantanediacetate as Uranyl Ion Linkers: Effect of Counterions, Solvents and Differences in Flexibility

Pierre Thuéry 1, * Youssef Atoini 2 Jack Harrowfield 2, *
* Corresponding author
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 : Seven homo-or heterometallic uranyl ion complexes with 1,3-adamantanedicarboxylic acid (H$_2$ADC) or 1,3-adamantanediacetic acid (H$_2$ADA) have been synthesized under solvo-hydrothermal conditions in the presence of different counterions and organic cosolvents, and characterized by their crystal structure and uranyl emission spectrum. [PPh$_3$Me][UO$_2$(ADC)(NO$_3$)] (1) crystallizes as a simple monoperiodic chain, but [PPh$_4$]$_2$[(UO$_2$)$_2$(ADC)$_3$]. 2H$_2$O (2) and [PPh$_4$]$_2$[(UO$_2$)$_2$(ADA)$_3$] (3) display trough-like monoperiodic assemblies (assembled in pairs in 3) in the cavity of which the counterions are located. A similar arrangement is found in [Ni(cyclen)(H$_2$O)][(UO$_2$)$_2$(ADC)$_3$].H$_2$O (4). Diaxial bonding of Ni II in [(UO$_2$)$_2$(ADC)$_2$Ni(R,S-Me$_6$cyclam)(HCOO)$_2$].CH$_3$CN (5) and [UO$_2$(ADA)$_2$Ni(R,S-Me$_6$cyclam)] (6) results in bridging monoperiodic uranyl-containing subunits into neutral, diperiodic networks. [UO$_2$(ADA)(DMPU)] (7), containing coordinated N,N′-dimethylpropyleneurea, is also a diperiodic assembly with the common fes topological type. Except complex 6 which is non-luminescent, all complexes give solid-state emission spectra displaying the usual vibronic fine structure, albeit with low photoluminescence quantum yields.
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Pierre Thuéry, Youssef Atoini, Jack Harrowfield. 1,3-Adamantanedicarboxylate and 1,3-Adamantanediacetate as Uranyl Ion Linkers: Effect of Counterions, Solvents and Differences in Flexibility. European Journal of Inorganic Chemistry, Wiley-VCH Verlag, 2019, 2019, pp.4440-4449. ⟨10.1002/ejic.201900957⟩. ⟨cea-02311018⟩

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