Tungsten tetrabromide (WBr4) has a higher molecular weight and a larger molecular volume due to the larger atomic radius and stronger electronegativity of the bromine atom. Its physical parameters such as melting point, boiling point and vapor pressure are therefore relatively high. Tungsten tetrabromide is a highly reactive compound that is easily decomposed at room temperature, so its stability is relatively low. In addition, due to the high electronegativity and solubility of bromine atoms, the solubility of tungsten tetrabromide in some solvents is relatively large.
Let’s look at tungsten tetrachloride (WCl4). In contrast, tungsten tetrachloride has a smaller molecular weight and molecular volume because of the smaller atomic radius and lower electronegativity of chlorine atoms. This leads to relatively low physical parameters such as melting point, boiling point and vapor pressure of tungsten tetrachloride. However, the stability of tungsten tetrachloride is relatively high, and it is not easy to decompose at room temperature. In addition, due to the low electronegativity and low solubility of chlorine atoms, the solubility of tungsten tetrachloride in some solvents is relatively low.
Tungsten tetrabromide and tungsten tetrachloride also behave differently in terms of optical properties. Due to the differences in the absorption spectra of bromine atoms and chlorine atoms in the ultraviolet and visible light regions, the absorption spectra and refractive indices of tungsten tetrabromide and tungsten tetrachloride are also different. The absorption spectrum of tungsten tetrabromide is mainly in the near-infrared and visible light regions, while the absorption spectrum of tungsten tetrachloride is mainly in the ultraviolet and near-ultraviolet regions. In addition, their refractive index is also different, the refractive index of tungsten tetrabromide is relatively large, while the refractive index of tungsten tetrachloride is relatively small.
In terms of thermal properties, the thermal stability of tungsten tetrabromide and tungsten tetrachloride is also different. Tungsten tetrabromide has relatively low thermal stability and is easy to decompose at high temperature. However, tungsten tetrachloride has relatively high thermal stability and can remain stable at higher temperatures. This gives tungsten tetrachloride better performance in certain high temperature applications.
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