There are some differences in physical and chemical properties between tetrabromotungsten (WBr4) and dibromotungsten (WBr2). The following are their main differences:
Phase: Tungsten tetrabromide and tungsten dibromide are both solid at room temperature.
Melting point: The melting point of tetrabromotungsten is higher, about 220-230°C, while the melting point of tungsten dibromide is lower, about 150-160°C.
Density: The density of tetrabromotungsten is higher, about 7.6-7.7 g/cm³, while the density of tungsten dibromide is lower, about 6.3-6.5 g/cm³.
Color: tetrabromotungsten is usually dark brown or reddish brown, while tungsten dibromide is grayish black.
Solubility: Tetrabromotungsten has some solubility in some organic solvents, while tungsten dibromide is relatively insoluble in common solvents.
Crystal structure: The crystal structure of tetrabromotungsten is orthorhombic, while the crystal structure of tungsten dibromide is hexagonal.
Chemical Properties: Due to their different chemical coordination numbers, tetrabromotungsten and tungsten dibromide show different properties and reaction pathways in chemical reactions.
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