[Ni(cyclam)]²⁺ and [Ni(R,S-Me₆cyclam)]²⁺ as Linkers or Counterions In Uranyl–Organic Species with cis- and trans-1,2-Cyclohexanedicarboxylate Ligands

Abstract

contains discrete bis(µ3-oxo)-centered tetranuclear uranyl complexes, organized into columns and layers by extensive hydrogen bonding to the counterions. The discoidal shape, available axial coordination sites and hydrogen bond donor potential of these macrocyclic Ni II complexes make them efficient assembling agents in uranyl-organic coordination polymers. As often observed in the presence of d-block metal cations, uranyl luminescence is either completely or partially quenched in complexes 1 and 3, respectively.

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

“…The hydrogen bond between N1 and the formate atom O7 bound to uranyl [N ··· O 3.250(3) Å, H ··· O 2.56 Å, N–H···O 139°], which forms a ring with the descriptor R 1 1 (6), is typical of the mode of association of [M(cyclam)] 2+ and [M( R , S ‐Me 6 cyclam)] 2+ cations with uranyl carboxylate complexes. [22b], [22c], It probably contributes to the incorporation of these cations in the coordination polymer through axial coordination of the transition metal ion, and thus to the increase in periodicity through linking together uranyl‐only 1D polymeric subunits. The layers in 5 are slightly corrugated and they pack so as to define narrow channels containing the acetonitrile solvent molecules, the KPI being 0.69.…”

Uranyl Coordination Compounds with Alkaline Earth Metals and Crotonate Ligands

“…Most commonly uranium atoms exist in solutions in the oxidation state +6 in the form of uranyl ions UO 2 2+ . Such uranyl ions originate many coordination compounds with diverse organic and inorganic ligands (See for example, refs …”

“…Such uranyl ions originate many coordination compounds with diverse organic and inorganic ligands (See for example, refs. [4][5][6][7][8][9][10][11][12][13] ). Acetate complexes of uranyl ions are used in stages of nuclear fuel reprocessing, [14,15] for staining in microcomputed tomography, [16] in gravimetric and colorimetric analysis [17] and are being widely explored, including in the sense of radioactivity and toxicity (See for example, refs.…”

“…[Mg(H 2 O) 6 4 (crtH) 2 [UO 2 (crt) 3 ] 4 }⋅3H 2 O (4) was published earlier in the paper in ref., [28] which also features the full systematics of all known to date heteronuclear clusters under discussion. Unfortunately, Be containing compound forms clusters of crystals under thermal evaporation of solutions and we were not able to grow an X-ray quality single crystal yet, although we have evidence of its existence in the solid state.…”

Complex Uranyl Dichromates Templated by Aza-Crowns

“…Macrocycles including crown ethers and particularly their aza derivatives seem to be the most proper candidates due to their applications in actinide partitioning [28,29], given their high selectivity for uranium [30] and neptunium [31,32]. Recently, crown ether complexes with alkali metals [33] and aza-crown ether complexes with Ni [34] were used as assemblers and linkers in uranyl-organic coordination polymers. In addition to metal-organic compounds, a number of works were devoted to the preparation of uranyl oxysalts templated by crown ethers [35][36][37][38].…”