Potassium and magnesium succinatouranilates – Synthesis and crystal structure

Crown Ethers and Their Alkali Metal Ion Complexes as Assembler Groups in Uranyl–Organic Coordination Polymers with cis-1,3-, cis-1,2-, and trans-1,2-Cyclohexanedicarboxylates

“…Atom K1 and its 18C6 ligand have inversion symmetry while K2 is disordered over two positions and bound to a very badly resolved 18C6 molecule, and K3, with half occupancy, is only bound to oxalate and water ligands. K1 and one component of K2 are bound to the uranyl oxo atoms O1 (and its symmetry equivalent) and O3, respectively, with K–O bond lengths of 2.794(8) and 2.792(12) Å, these values being in good agreement with those usual for such bonds, ,,,,− the average value for the 27 cases reported in the CSD (some of which, not cited here, involve U V instead of U VI ) being 2.76(10) Å. In the case of K1, the location of the cation within the average plane of the crown ether enables bonding on each side, and this cation thus plays an assembling role through linking adjacent sheets.…”

Structure-Directing Effects of Counterions in Uranyl Ion Complexes with Long-Chain Aliphatic α,ω-Dicarboxylates: 1D to Polycatenated 3D Species

“…The last compound in the present series, [(UO 2 ) 2 K 2 (C7) 3 (H 2 O)]·0.5H 2 O ( 9 ), contains a counterion quite different from those in complexes 1 – 8 , since it is a single alkali metal cation. Although uranyl ion complexes with C n 2– dicarboxylate ligands incorporating alkali or alkaline-earth metal cations have been reported for n = 4 (succinate) and n = 5 (glutarate), − for example (with formation of hydrogen bonded interpenetrated frameworks in one case), no example has been reported with larger n values. The asymmetric unit in 9 , which crystallizes in the Sohncke group P 2 1 2 1 2 1 , contains two uranyl cations, both chelated by three carboxylate groups [U–O­(oxido) 1.763(8)–1.774(9) Å, U–O­(carboxylate) 2.443(7)–2.508(7) Å], and two potassium cations in different environments (Figure ).…”

“…The network is binodal (dicarboxylate ligand and uranyl cations), the nickel(II) cations being simple links, and it has the point symbol {4 2 .6 3 .8}{4 2 .6} and the V2O5 topological type. Due to the tilting of the ribbons within the layers, the carboxylic groups are directed toward the interlayer space; however, those pertaining to different layers do not face exactly each other so as to form double hydrogen bonds as in 3, but each of them is bound instead to a lattice water molecule which is itself linked to one carboxylate oxygen atom and to a carboxylic group of the adjacent layer (Figure 9), thus forming a water-mediated 3D Although uranyl ion complexes with Cn 2dicarboxylate ligands incorporating alkali or alkaline-earth metal cations have been reported for n = 4 (succinate), 48 and n = 5 (glutarate), [49][50][51][52] for example (with formation of hydrogen bonded interpenetrated frameworks in one case 50 crystallizes in the same space group as 9, and with quite similar unit cell parameters. 12 These networks are very convoluted, being built of central chains running parallel to one another and surrounded on either side by two sets of chains running in the transverse direction ( Figure 11).…”