R<scp>AMAN</scp>‐spektroskopische Untersuchungen an Chlorouranaten(V) und Chloroniobaten

Stumpp, E.; Piltz, G.

doi:10.1002/zaac.19744090107

Cited by 14 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, it cannot be ruled out that the slightly contaminated or allegedly pure samples [17,18] contained some K[NbCl 6 ] Á NbCl 5 . The molecular geometry of the centrosymmetric edgesharing bioctahedra of Nb 2 Cl 10 is very similar in both compounds (see Tables 2 and 4) and agrees nicely with the dimers found in the two well-characterized solid phases of niobium pentachloride [19,20], although the packing mode differs.…”

Section: Discussionmentioning

confidence: 97%

The crystal structures of K[NbCl₆] · NbCl₅ and NO[NbCl₆] · NbCl₅

Henke¹,

Mayer

2010

Zeitschrift Für Kristallographie - Crystalline Materials

View full text Add to dashboard Cite

Nitrosonium / Hexachlorido niobates / Disorder / Twinning / Group-subgroup relations / Bärnighausen trees / Single-crystal structure analysis / X-ray diffraction Abstract. The NbCl 5 adducts of M[NbCl 6 ] Á NbCl 5 with M ¼ K or NO are structurally related via their common supergroup Fmmm. K[NbCl 6 ] Á NbCl 5 crystallizes in the triclinic space group C 1 1 with a ¼ 9.898 (1) (1) and Z ¼ 4 at room temperature. For the monoclinic nitrosonium compound with space group C2/c X-ray diffraction data have been recorded at 173 K giving a ¼ 9.530(1), b ¼ 9.412(1), c ¼ 33.38(1) A, b = 92.68(1) and Z ¼ 8. Layers of NbCl 5 dimers alternate with cation-centred double layers of the NbCl 6 À ions, oriented parallel to the a-b plane. Compared to the cubic perovskite SrTiO 3 , the NbCl 6 À 'octahedra' of the K þ salt are uniformly rotated by 5 around the stacking axis. On the contrary, the NO þ salt shows 'antiferrorotative' ordering by AE12 in alternate layers. Crystal symmetry and twinning laws reflect the structural differences, but the similarity between both structures prevails.

show abstract

Section: Discussionmentioning

confidence: 97%

The crystal structures of K[NbCl₆] · NbCl₅ and NO[NbCl₆] · NbCl₅

Henke¹,

Mayer

2010

Zeitschrift Für Kristallographie - Crystalline Materials

View full text Add to dashboard Cite

show abstract

“…Furthermore, UC16-is a well-known species in a number of nonaqueous solvents. For example, solutions of UC18in thionyl chloride are readily obtained by dissolving uranium trioxide in the refluxing solvent (14,15); these solutions are quite stable toward hydrolysis and/or disproportionation (16) and a number of hexachloro-uranates (V), MUC16, can be obtained from these solutions (15,17). Since the spectrum of UC16is well-known (18), spectroscopic measurements would be helpful to confirm the existence of the uranium (V) species postulated in this paper.…”

Section: Uciz(4 -X)+ + E---> U 8+ Q-xcl-[3]mentioning

confidence: 99%

Electrochemistry of Uranium (IV) in Acidic AlCl3 ‐ NaCl Melts at 175°C

Meuris

Heerman

D'Olieslager

1980

J. Electrochem. Soc.

View full text Add to dashboard Cite

Solutions of uranium (IV) in acidic AlCl3‐normalNaCl melts false(52–70 normalmole percent AlCl3false) at 175°C were prepared by dissolving uranium (IV) oxide or chloride. The electrochemistry of uranium (IV) in these melts, investigated by pulse polarography and cyclic voltammetry, corresponds to two reversible one‐electron reactions. For the U(IV)/U(III) redox couple, the reaction is given byUClx)(4−x++e−→U3++xCl−where 3≥x≥1 , the lower values of x being found for the most acidic melts. Thus, uranium (IV) exists in solution as UCl3+ , UCl22+ , and UCl3+ . For the U(V)/U(IV) redox couple, the reaction is written asUCly)(5−y++e−→UClx)(4−x++)(y−xCl−where false(y−xfalse)=3 over almost the entire pCl range covered in this work. Therefore, the uranium (V) species in solution are formulated as UCl6− , UCl5 , and UCl4+ . However, since some oxide impurities are probably always present in molten chloroaluminates, the existence of a UOClyfalse(3−yfalse)+ species cannot be totally excluded.

show abstract