Protactinium (IV) fluoride

Crystal structure
__  Pa 4+      __  F -
General
Surname	Protactinium (IV) fluoride
other names	Protactinium tetrafluoride
Ratio formula	PaF 4
Brief description	dark red-brown solid
External identifiers / databases
CAS number 13842-89-2 Wikidata Q4493225
properties
Molar mass	307.09 g mol −1
Physical state	firmly
Hazard and safety information
Radioactive
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Protactinium (IV) fluoride is a chemical compound of protactinium from the group of fluorides .

presentation

Protactinium (IV) fluoride can be prepared by fluorination of protactinium (IV) oxide with a hydrogen fluoride - hydrogen are obtained mixture at 600 ° C.

${\displaystyle {\ce {PaO2 + 4 HF -> PaF4 + 2 H2O}}}$

The preparation by reducing fluorination of protactinium (V) oxide with a hydrogen fluoride-hydrogen mixture at 500 ° C. is also possible.

${\displaystyle {\ce {P2O5 + 8 HF + H2 -> 2 PaF4 + 5 H2O}}}$

properties

Protactinium (IV) fluoride is a dark red-brown, non-volatile solid that is insoluble in hydrofluoric acid , ammonium hydrogen difluoride , nitric acid and hydrochloric acid , but can be broken down by alkalis. It has a monoclinic crystal structure of uranium tetrafluoride type with I 2 / c (No. 15, position 6) and the lattice parameters a = 1270 pm, b = 1070 pm, c = 842 pm, β = 126.3 °.

Individual evidence

1. ↑ ^{a b c d e} Georg Brauer (Ed.), With the collaboration of Marianne Baudler u. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 1171.
2. ↑ The hazards emanating from radioactivity do not belong to the properties to be classified according to the GHS labeling. With regard to other hazards, this substance has either not yet been classified or a reliable and citable source has not yet been found.