Tungsten tetrabromide (WBr4) and tungsten tetrachloride (WCl4) differ significantly in their oxidation states.
The tungsten atom in the tungsten tetrabromide molecule is covalently bonded to four bromine atoms, and each bromine atom provides an electron to participate in the bonding, so that the oxidation state of the tungsten atom is +4. In this case, the valence state of the tungsten atom of tungsten tetrabromide remains unchanged, i.e. the oxidation state of tungsten is +6. This stable oxidation state indicates that tungsten tetrabromide is not prone to redox reactions in chemical reactions and has certain stability.
In contrast, the molecular structure of tungsten tetrachloride (WCl4) is also covalently bonded by tungsten atoms and four chlorine atoms, and each chlorine atom provides an electron to participate in the bonding, so that the oxidation state of the tungsten atom is +4. However, unlike tungsten tetrabromide, the oxidation state of the tungsten atom of tungsten tetrachloride is relatively easy to change. In certain chemical environments, the oxidation state of the tungsten atom of tungsten tetrachloride can be reduced to +2 or +6. This property of variable oxidation states makes tungsten tetrachloride somewhat reactive and plastic in certain chemical reactions.
In practical applications, the difference in the oxidation state of tungsten tetrabromide and tungsten tetrachloride may affect their reactivity and application range in certain chemical reactions. For example, in some chemical reactions that need to maintain a specific oxidation state, we may need to choose a compound with a stable oxidation state, such as tungsten tetrabromide, in order to maintain the progress of the reaction and the stability of the product. In some chemical reactions that need to use changes in oxidation states, we may be more inclined to choose compounds with variable oxidation states, such as tungsten tetrachloride, to promote the progress of the reaction and achieve specific chemical results.
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