Misplaced Pages

Protactinium(V) bromide

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
(Redirected from Protactinium pentabromide)
Protactinium(V) bromide
Names
IUPAC name Protactinium(V) bromide
Identifiers
CAS Number
3D model (JSmol)
SMILES
  • (Br)(Br)(Br)(Br)Br
Properties
Chemical formula PaBr5
Molar mass 630.556 g mol
Appearance red solid
Density 4.98 g/cm
Structure
Crystal structure monoclinic
Space group P21/c , No. 14
Related compounds
Other anions Protactinium(V) fluoride
Protactinium(V) chloride
Protactinium(V) iodide
Other cations Praseodymium(III) bromide
Thorium(IV) bromide
Uranium(IV) bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references
Chemical compound

Protactinium(V) bromide is an inorganic compound. It is a halide of protactinium, consisting of protactinium and bromine. It is radioactive and has a chemical formula of PaBr5, which is a red crystal of the monoclinic crystal system.

Preparation

Protactinium(V) bromide can be obtained by reacting protactinium(V) chloride with boron tribromide at 500 to 550 °C.

3PaCl5 + 5BBr3 → 3PaBr5 + 5BCl3

It can also be obtained by reacting protactinium(V) oxide with aluminum bromide at 400 °C.

Physical properties

Protactinium(V) bromide is an orange-red, crystalline, extremely moisture-sensitive solid that reacts violently with water and ammonia, but is persistent in absolutely dry air. It is insoluble in isopentane, dichloromethane and benzene, and in anhydrous acetonitrile is dissolves to form PaBr5•4CH3CN. It comes in several modifications. Below 400 °C as an α-modification and above 400 °C as a β-modification. The α-form has a monoclinic crystal structure of the space group P21/c (No. 14) and lattice parameters a = 1296 pm, b = 1282 pm, c = 992 pm, β = 108° and the β-form also has monoclinic crystal structure with space group P21/n (No. 14, position 2) and lattice parameters a = 838.5 pm, b = 1120.5 pm, c = 895.0 pm, β = 91.1°. The β form exists as a dimer. At 400 °C in a vacuum, protactinium(V) bromide sublimes. A γ-form, which has a β-uranium(V) chloride-type crystal structure, has also been detected.

References

  1. ^ Brown, D.; Petcher, T. J.; Smith, A. J. (1968). "Crystal Structures of some Protactinium Bromides". Nature. 217 (5130): 737. Bibcode:1968Natur.217..737B. doi:10.1038/217737a0. S2CID 4264482.
  2. ^ Brown, D.; Petcher, T. J.; Smith, A. J. (1969). "The crystal structure of β-protactinium pentabromide". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 25 (2): 178. Bibcode:1969AcCrB..25..178B. doi:10.1107/S0567740869007357.
  3. ^ Georg Brauer (Hrsg.), unter Mitarbeit von Marianne Baudler u. a.: Handbuch der Präparativen Anorganischen Chemie. 3., umgearbeitete Auflage. Band I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6, S. 1177.
  4. Advances in Inorganic Chemistry and Radiochemistry (in German), Academic Press, 1970, p. 31
  5. D. Brown, T. J. Petcher, A. J. Smith: The crystal structure of β-protactinium pentabromide. In: Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 25, S. 178–182, doi:10.1107/S0567740869007357.
  6. D. Brown: The polymorphism of protactinium pentabromide. In: Inorganic and Nuclear Chemistry Letters. 15, 1979, S. 219–223, doi:10.1016/0020-1650(79)80132-4.
Protactinium compounds
Pa(II)
Pa(III)
Pa(IV)
Pa(V)
Salts and covalent derivatives of the bromide ion
HBr He
LiBr BeBr2 BBr3
+BO3
CBr4
+C
NBr3
BrN3
NH4Br
NOBr
+N
Br2O
BrO2
Br2O3
Br2O5
BrF
BrF3
BrF5
Ne
NaBr MgBr2 AlBr
AlBr3
SiBr4 PBr3
PBr5
PBr7
+P
S2Br2
SBr2
BrCl Ar
KBr CaBr2
ScBr3 TiBr2
TiBr3
TiBr4
VBr2
VBr3
CrBr2
CrBr3
CrBr4
MnBr2 FeBr2
FeBr3
CoBr2 NiBr2
NiBr4
CuBr
CuBr2
ZnBr2 GaBr3 GeBr2
GeBr4
AsBr3
+As
+AsO3
SeBr2
SeBr4
Br2 Kr
RbBr SrBr2 YBr3 ZrBr2
ZrBr3
ZrBr4
NbBr5 MoBr2
MoBr3
MoBr4
TcBr3
TcBr4
RuBr3 RhBr3 PdBr2 AgBr CdBr2 InBr
InBr3
SnBr2
SnBr4
SbBr3
+Sb
-Sb
Te2Br
TeBr4
+Te
IBr
IBr3
XeBr2
CsBr BaBr2 * LuBr3 HfBr4 TaBr5 WBr5
WBr6
ReBr3 OsBr3
OsBr4
IrBr3
IrBr
4
PtBr2
PtBr4
AuBr
AuBr3
Hg2Br2
HgBr2
TlBr PbBr2 BiBr3 PoBr2
PoBr4
AtBr Rn
FrBr RaBr2 ** Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
 
* LaBr3 CeBr3 PrBr3 NdBr2
NdBr3
PmBr3 SmBr2
SmBr3
EuBr2
EuBr3
GdBr3 TbBr3 DyBr3 HoBr3 ErBr3 TmBr2
TmBr3
YbBr2
YbBr3
** AcBr3 ThBr4 PaBr4
PaBr5
UBr4
UBr5
NpBr3
NpBr4
PuBr3 AmBr2
AmBr3
CmBr3 BkBr3 CfBr3 EsBr2
EsBr3
Fm Md No
Halides of actinides
Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm
+6 UF6
UCl6
NpF6 PuF6 AmF6 EsF6
+5 PaF5
PaCl5
PaBr5
PaI5
UF5
UCl5
UBr5
NpF5 PuF5
+4 ThF4
ThCl4
ThBr4
ThI4
PaF4
PaCl4
PaBr4
PaI4
UF4
UCl4
UBr4
UI4
NpF4
NpCl4
NpBr4
PuF4 AmF4 CmF4 BkF4 CfF4 EsF4
+3 AcF3
AcCl3
AcBr3
AcI3
ThF3
ThCl3
ThI3
UF3
UCl3
UBr3
UI3
NpF3
NpCl3
NpBr3
NpI3
PuF3
PuCl3
PuBr3
PuI3
AmF3
AmCl3
AmBr3
AmI3
CmF3
CmCl3
CmBr3
CmI3
BkF3
BkCl3
BkBr3
BkI3
CfF3
CfCl3
CfBr3
CfI3
EsF3
EsCl3
EsBr3
EsI3
FmCl3
+2 ThI2
ThCl2
AmF2
AmCl2
AmBr2
AmI2
CfI2
CfCl2
EsCl2
EsBr2
EsI2
FmCl2
Categories:
Ad.

Before you begin

Get Life Coaching Tips
Or continue to this article
X