Tungsten tetrabromide (WBr4) and tungsten hexabromide (WBr6) have some differences in physical properties.
State: Tungsten tetrabromide is solid, and tungsten hexabromide is orange-yellow crystal at room temperature, but it can be transformed into gaseous state at high temperature.
Melting point: Tungsten tetrabromide has a lower melting point of about 159°C, while tungsten hexabromide has a higher melting point of about 287°C.
Density: The density of tungsten tetrabromide is relatively low, about 4.48 g/cm³, while the density of tungsten hexabromide is relatively high, about 4.83 g/cm³.
Solubility: Tungsten tetrabromide is soluble in common solvents, such as organic solvents such as dimethylsulfoxide (DMSO) and acetonitrile, but insoluble in water. Tungsten hexabromide is relatively insoluble in common solvents.
Crystal structure: The crystal structure of tungsten tetrabromide is a layered structure, while the crystal structure of tungsten hexabromide is an octahedral structure.
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