Interhalogen Compounds: Formation, Properties, and Uses
Interhalogen compounds are unique molecules formed when halogen group elements react with each other, displaying covalent and diamagnetic properties. Explore their preparation methods, physical properties, and various applications in industries such as catalysis and solvent use.
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Presentation Transcript
INTER HALOGEN COMPOUNDS BY SWAROOP
INTRODUCTION Interhalogen compounds are compounds formed when halogen group elements react with each other In other words, it is a molecule which consists of two or more different elements of group 17. There are four types of interhalogen compounds: Diatomic interhalogens (AX) Tetratomic interhalogens (AX3) Hexatomic interhalogens ( AX5) Octatomic interhalogens (AX7) A halogen with large size and high electro positivity reacts with an element of group 17 with small size and lower electro positivity. As the ratio of the radius of larger and smaller halogen increases, the number of atoms in a molecule also increases.
Preparation of Interhalogen compounds These molecules are formed due to the direct combination or by the action of a group 17 elements with a lower interhalogen compound under specific conditions. For example: At 437K, chlorine reacts with fluorine of equal volume to form ClF. This method is widely used in the production of group 17 fluorides. Cl2+F2 2ClF (473K) I2+ Cl2 2ICl Properties of Interhalogen Compounds These molecules are covalent and diamagnetic in nature. The bonds formed between these compounds are more reactive than diatomic halogen bonds. The physical properties of these molecules are transitional between their constituents. The molecular structure of AX3molecules is bent T shaped, and AX5molecule is square or pyramidal and the structure of AX7is bipyramidal or pentagonal. The bond length depends upon the size of the constituent halogens. The molecule which consists of lighter group 17 elements is fairly colourless but one which is made up of higher halogens is deeper in colour which is due to the rise in the molecular weight.
Uses of Interhalogen Compounds These are used as non-aqueous solvents. They are used as a catalyst in a few reactions. UF6which is used in the enrichment of235U is produced by using ClF3and BrF3. U (s) + 3ClF3(l) UF6(g) + 3ClF (g) These are used as fluorinating compounds.
