The crystal structures of hexahalouranates. I. Bis(triphenylethylphosphonium) hexachlorouranate(IV) and bis(triphenylethylphosphonium) hexabromouranate(IV)

Abstract

The crystal structures of the bis(triphenylethylphosphonium) hexahalouranates(IV), [P(C 6H5)3 C 2H5 ] 2[U X 6] IX = (I) chlorine, (II) bromine], have been determined from three-dimensional X-ray diffraction data collected on an automatic Philips PW 1100 four-circle diffractometer using 2894 (I) and 1448 (II) structure amplitudes from independent reflexions. The compounds crystallize in the (I) triclinic P i, and (II) mono-

Synthesis and crystal structure of triethylammonium hexabromidouranate(IV) dichloromethane monosolvate

“…The Br-U-Br angles in the octahedron-like polyhedron range from 86.519 (13) to 94.879 14and show a quite significant distortion from the ideal angle of 90 . These atomic distances and angles are in good agreement with the compounds reported previously (Bohrer et al, 1988;Caira et al, 1978). The atomic distances of the two symmetry-independent triethylammonium cations are in good agreement with each other, as well as with the literature, for example in bis(triethylammonium) tetrachloridodioxidouranium(VI) (Gatto et al, 2003;Serezhkina et al, 2010;Bois et al, 1976).…”

“…All these compounds have a slightly distorted octahedron-shaped [UCl 6 ] 2coordination polyhedron in common with Cl-U-Cl angles close to 90 and some of them, like [BuMeIm] 2 [UCl 6 ], feature hydrogenbonding networks or weak hydrogen interactions (Nikitenko et al, 2007). Examples of hexabromidouranates(IV) with organic cations are (PPh 4 ) 2 [UBr 6 ]Á4CH 3 CN (Bohrer et al, 1988), [P(C 6 H 5 ) 3 C 2 H 5 ] 2 [UBr 6 ] (Caira et al, 1978) or (Ph 3 Et-P) 2 [UBr 6 ] (Caira et al, 1978). As in the case of the hexachloridouranates(IV), the [UBr 6 ] 2octahedra show a slight distortion and the compounds feature an extended network of hydrogen bonds.…”

“…The C-HÁ Á ÁBr hydrogen bonds in (Ph 3 EtP) 2 [UBr 6 ](Caira et al, 1978) range from 2.782 (1) to 3.504 (2) Å . An example for N-HÁ Á ÁBr hydrogen bonds is (C 6 H 8 NS 3 ) 2 [UBr 6 ](Conradi et al, 1986), with lengths of 2.81 (9) Å for the interactions.…”

Structure and stereochemistry in f-block complexes of high co-ordination number. Part 1. The [M(unidentate ligand X)(unidentate ligand Y)7] system : crystal structure of bis[chloroheptakis(dimethylformamide)uranium(IV)] tris[tetrachlorodioxouranate(VI)]

“…U-CI 2.813(4) 8, in the seven-co-ordinate [UIv-C1(OPMe3),l3+ and 2.70(2) 8, in eight-co-ordinate [UIV-C12(OSMe2),J2 + ,' although the distance is common enough in six-co-ordinate uranium(rv). 8 The mean U-0 distance of 2.35…”

Ethyltriphenylphosphonium perrhenate and (iodomethyl)triphenylphosphonium perrhenate

“…In published structures containing ethyltriphenylphosphonium cations (Broder et al, 2002;Caira et al, 1978;Be  langer & Beauchamp, 1993;Fedin et al, 1990;Janickis et al, 2002;Ansari et al, 1990), two possible cation geometries have been observed. The criterion is the deviation of the ethyl group from the plane de®ned by the phenyl ring trans to the methyl group.…”