There are some differences in the optical properties of tungsten tetrabromide (WBr4) and tungsten dibromide (WBr2):
Tungsten tetrabromide (WBr4): Due to its higher number of bromine atoms and larger molecular structure, tetrabromotungsten may absorb and scatter light in the visible range, resulting in a dark or opaque appearance. As a result, it is less optically transparent, often showing lower transmittance and higher absorbance.
Tungsten dibromide (WBr2): Compared to tetrabromotungsten, tungsten dibromide has fewer bromine atoms and a smaller molecular structure. As a result, it may have a higher transmittance to visible light, presenting a lighter color or transparent appearance. Tungsten dibromide may exhibit some optical activity in certain wavelength ranges, such as spinning properties for polarized light.
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