Protactinium(V) chloride

Protactinium(V) chloride is the chemical compound composed of protactinium and chlorine with the formula PaCl₅. It forms yellow monoclinic crystals and has a unique structure composed of chains of 7 coordinate pentagonal bipyramids which share their edges.^[3]

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Protactinium(V) chloride

Names
IUPAC name Protactinium(V) chloride
Other names Protactinium pentachloride, Protactinium chloride
Identifiers
CAS Number	13760-41-3
3D model (JSmol)	Interactive image
ChemSpider	9222996
PubChem CID	11047828
CompTox Dashboard (EPA)	DTXSID401045196
InChI InChI=1S/5ClH.Pa/h5*1H;/q;;;;;+5/p-5 Key: QRPCDPJECLHYKR-UHFFFAOYSA-I
SMILES Cl[Pa](Cl)(Cl)(Cl)Cl
Properties
Chemical formula	PaCl5
Molar mass	408.301 g/mol
Appearance	yellow monoclinic crystals[1]
Density	3.74 g/cm3[1]
Melting point	306 °C (583 °F; 579 K)[1]
Boiling point	420 °C (788 °F; 693 K)[2]
Structure
Crystal structure	monoclinic, mS24
Space group	c12/c1, #15
Coordination geometry	Pa, 7, pentagonal bipyramidal Cl, 1 and 2
Related compounds
Other anions	Protactinium(V) fluoride Protactinium(V) bromide Protactinium(V) iodide
Other cations	Praseodymium(III) chloride Uranium(IV) chloride Thorium(IV) chloride
Related compounds	Protactinium(IV) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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Protactinium(V) chloride can react with boron tribromide at high temperatures to form protactinium(V) bromide.^[4] It also reacts with fluorine to form protactinium(V) fluoride at high temperatures.^[4]