Tungsten tetrabromide (WBr4) and tungsten tetrachloride (WCl4) are highly reactive inorganic compounds. However, tungsten tetrabromide is more reactive due to the electronegativity and larger atomic radius of the bromine atom. In chemical reactions, bromine atom can be used as a good leaving group to participate in various types of reactions, such as nucleophilic substitution reactions, electrophilic addition reactions, etc. At the same time, due to the high stability of bromide ions, the solubility of tungsten tetrabromide in some solvents is relatively large.
In contrast, the chemical properties of tungsten tetrachloride (WCl4) are relatively stable. The electronegativity and atomic radius of chlorine atoms are small, making tungsten tetrachloride relatively low in reactivity. In some reactions, chlorine atom can be used as a good nucleophile to participate in nucleophilic substitution reactions and so on. However, due to the low stability of chloride ion, the solubility of tungsten tetrachloride in some solvents is relatively low.
Tungsten tetrabromide and tungsten tetrachloride also behave differently in redox reactions. Due to the high electronegativity of the bromine atom, tungsten tetrabromide has a strong reducing property and is easily oxidized to a higher valence tungsten compound. In contrast, tungsten tetrachloride has relatively weak reducing property and is not easily oxidized. This makes tungsten tetrabromide more reactive in certain reduction reactions.
In the coordination reaction, there are also differences in the coordination abilities of tungsten tetrabromide and tungsten tetrachloride. Due to the larger radius and higher electronegativity of the bromine atom, tungsten tetrabromide can be used as a good ligand to form stable complexes with transition metal ions. In contrast, the coordination ability of tungsten tetrachloride is relatively weak, and the stability of the formed complex is also low. This makes tungsten tetrabromide have higher application value in some coordination reactions and synthesis.
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