[no1]

uranium (IV) bromide
• Formula as commonly written: UBr4
• Hill system formula: Br4U1
• CAS registry number: [13470-20-7]
• Formula weight: 557.645
• Class: bromide
Synonyms
• uranium (IV) bromide
• uranium bromide
• uranium tetrabromide
Physical properties
• Colour: brown
• Appearance: crystalline solid
• Melting point: 519°C
• Boiling point: 791°C
• Density: 5190 kg m-3
Element analysis and oxidation numbers
For each compound, and where possible, a formal oxidation number for each element is given, but the usefulness of this number is limited, especially so for p-block elements in particular. Based upon that oxidation number, an electronic configuration is also given but note that for more exotic compounds you should view this as a guide only.
Element % Formal oxidation state Formal electronic configuration
Br 57.32 -1 [Ar].3d10.4s2.4p6
U 42.68 4 [Rn].5f2
Synthesis
Not available
Solid state structure
• Geometry of uranium: 7 coordinate: pentagonal bipyramidal
• Prototypical structure:



Isotope pattern
What follows is the calculated isotope pattern for the UBr4 unit with the most intense ion set to 100%.
Formula: U1Br4
mass %
550 0.0
551 0.1
552 0.0
553 0.5
554 17.6
555 0.7
556 68.5
557 0.5
558 100.0
559 0.1
560 64.8
561 0.0
562 15.8