Structure of bis(2-pyridylthio-2-pyridinium) tetrachlorodioxouranate(VI)

Abstract

The intensity of a monitor reflexion measured after 20 reflexions showed that the crystal did not suffer any deterioration during data collection. The data were corrected for Lorentz and polarization factors, but not for absorption, because the irregular shape of the crystal did not allow accurate measurement of its dimensions [/~(Mo Ka) = 86.7 cm-q. The structure was solved by use of the heavy-atom method and refined isotropically to R = 11.4%. Further refinement cycles following introduction of anisotropic temperature factors for all non-hydrogen atoms and the inclusion of the H atoms bonded to C, in calculated positions (assuming C-H 0.95 A, and C--C-H 120 °) with assigned temperature factors of 5 A 2, reduced R to

Structural and Vibrational Properties of U(VI)O2Cl42- and Pu(VI)O2Cl42- Complexes

“…For the three uranium compounds presented herein ( U-Rb , U-Cs , and U-Me 4 N ), the average bond distances for the UO and UCl bonds are 1.77(1) and 2.67(1) Å, respectively (Table ). These bond lengths are consistent with previously reported uranyl tetrachloride compounds such as [Et 4 N] 2 UO 2 Cl 4 (UO, 1.76(2) and 1.77(3) Å; UCl, 2.65(1)–2.68(1) Å), [(NH 4 )(5-crown-5) 2 ] 2 UO 2 Cl 4 ·2MeCN (UO, 1.763(5) Å; UCl, 2.645(2) and 2.682(2) Å), and [SN 2 C 10 H 9 ] 2 UO 2 Cl 4 (UO, 1.77(1) Å; UCl, 2.662(5) and 2.665(5) Å) . Upon moving across the actinide series to plutonium (compounds Pu-Rb , Pu-Cs , and Pu-Me 4 N ), the average metal AnO bond length decreases 0.02 Å to 1.75(1) Å, while the AnCl bond contracts 0.01 Å to 2.66(1) Å (Table ).…”

Lattice Solvent and Crystal Phase Effects on the Vibrational Spectra of UO2Cl42–

“…In each case, the composition of the anion is identical, consisting of a linear uranyl moiety with four chloride ligands bound in the equatorial plane, forming a pseudo-octahedral geometry (Figure ). The average lengths of the UO and UCl bonds for complexes 1 – 6 are 1.773(4) and 2.670(8) Å, respectively (Table ), which are consistent with previously reported uranyl tetrachloride compounds containing cations such as Rb, Cs, Me 4 N, Et 4 N, [(NH 4 )(5-crown-5) 2 ], and SN 2 C 10 H 9 (UO: 1.751(9)–1.776(6) Å; U–Cl: 2.644(3)–2.682(2) Å). ,,,− …”

The uranyl tetrachloride anion as a tecton in the assembly of U(VI) hybrid materials

“…The crystal structures of seven compounds containing uranyl tetrachloride have been determined. While there are several previous papers that describe the structural chemistry of the [UO 2 Cl 4 ] 2À unit with various cationic species, including Group 1 and 2 metals, 18 crown ether complexs, 13,15,[19][20][21] organic ammonium, 22 imidazolium, 23,24 and phosphonium 25 cations, and others, [26][27][28] this moiety has not been exploited from a crystal engineering perspective. This work includes seven examples of organic cations, seen in Scheme 2, which can be divided into ''linear'' (1-4) and ''non-linear'' (5-7) sub-types based on the relative position of their cationic nitrogen centers with respect to one another.…”