Structure of a tetranuclear uranium(IV) compound: hemiaquatetrakis(trifluoroacetato)uranium(IV)–4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane (4/2)

Solvothermal Synthesis of Tetravalent Uranium with Isophthalate or Pyromellitate Ligands

“…These led to the production of approximately twenty new structures that were isolated by using various organic ligands (formate, [13] acetate, [14][15][16] glycolate, [17] dipicolinate, [18][19][20] malonate, [21] fumarate, [22] benzoate, [23][24][25] terephthalate, [26,27] 4,4Ј-biphenyldicarboxylate, [26] 2,6-naphthalenedicarboxylate, [26] trimesate [28] ). The structural diversity of tetravalent uranium chemistry was also highlighted by the isolation of different nuclearities of inorganic building units, such as monomers, trimers, [28,[17][18][19][20][21] tetramers, [14][15][16]22] hexamers, [13,22,25,26] decamers, [24] hexadecamers, [24] chains [29] or, more recently, the U 38 poly-oxo cluster. [23] In the present contribution, we extended this systematic study to the use of two new carboxylate ligands, such as isophthalic acid (noted 1,3-H 2 bdc) or pyromellitic acid (or 1,2,4,5-benzentetracarboxylic, noted H 4 btec).…”

{Np38} clusters: the missing link in the largest poly-oxo cluster series of tetravalent actinides

“…8 However, to the best of our knowledge, no {An 14 } complexes have been characterised for An(IV) thus far, indicating that the {An 14 } motif is probably not stable at least as a discrete species. In contrast, several discrete {An } complexes have been characterised for Th(IV) 35 and U(IV), [36][37][38][39][40][41][42][43] seven of which exhibit a planar tetranuclear arrangement that is structurally comparable with the {An 4 } subunits in the {An 38 } clusters (Section 4 in the ESI †). A striking difference between the {An 4 } subunits and the discrete tetranuclear An(IV) complexes is, however, the presence/ absence of m 4 -bridging groups.…”

Complexation of the uranyl ion (UO2)2+ with a tetraphenylimidodiphosphinate ligand: the first trinuclear uranyl complex comprising a double μ2-oxo (UO2) bridge

“…The central and outer UO 2 groups are also bridged by means of four eight-membered rings containing the ancillary ligand. The overall morphology of this compound may be regarded as a linear U 3 O 2 core engaging two different types of environments for the uranium atoms.Uranium complexes exhibit substantial structural diversity, existing as mono-, di-, tri-and multi-nuclear complexes in their solid-state framework [1][2][3][4][5]. Many of these compounds exhibit bridging by means of oxygen containing units, such as carboxylates, water molecules or hydroxy groups.…”

“…Uranium complexes exhibit substantial structural diversity, existing as mono-, di-, tri-and multi-nuclear complexes in their solid-state framework [1][2][3][4][5]. Many of these compounds exhibit bridging by means of oxygen containing units, such as carboxylates, water molecules or hydroxy groups.…”