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The present invention is related to a method for preparing an amorphous metal fluoride of the formula MX+FX-δ comprising the steps of a) providing a precursor, whereby the precursor comprises a structure having a formula of Mx+F(x-δ)-yBy; and b) reacting the precursor with a fluorinating

The present invention is related to a method for preparing an amorphous metal fluoride of the formula MX+FX-δ comprising the steps of a) providing a precursor, whereby the precursor comprises a structure having a formula of Mx+F(x-δ)-yBy; and b) reacting the precursor with a fluorinating agent generating the amorphous metal flouride having a formula of Mx+Fx-δ, whereby M is selected from the group comprising metals of the second, third and fourth main group and any subgroup of the periodic table, B is a coordinately bound group; x is any integer of 2 or 3; y is any integer between 1 and 3; δ is 0 to 0.1; and x-δ>y.

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The invention claimed is: 1. A method for preparing an amorphous metal fluoride of the formula Mx+Fx-δ comprising the steps of a) providing a precursor, whereby the precursor comprises a structure having a formula of Mx+F(x-δ)-yBy; and b) reacting the precursor with a fluorinating agent g

The invention claimed is: 1. A method for preparing an amorphous metal fluoride of the formula Mx+Fx-δ comprising the steps of a) providing a precursor, whereby the precursor comprises a structure having a formula of Mx+F(x-δ)-yBy; and b) reacting the precursor with a fluorinating agent generating the amorphous metal fluoride having a formula of Mx+Fx-δ, wherein M is selected from the group consisting of metals of the second, third and fourth main group and any subgroup of the periodic table, B is a coordinately bound group; x is any integer of 2 or 3; y is any integer of 1, 2 or 3; δ is 0 to 0.1; and x-δ>y. 2. The method according to claim 1, wherein B is selected from the group consisting of alkoxides, enolates and salts of carboxylic acids. 3. The method according to claim 2 wherein said alkoxides, enolates and salts of carboxylic acids have a length of 1 to 5 C atoms. 4. The method according to claim 1, wherein the precursor, the starting material for the precursor or the fluorinating agent is present in or introduced into an anhydrous organic solvent. 5. The method according to claim 4 wherein said anhydrous organic solvent is selected from the group consisting of alcohols, ethers, ketones, alkanes, formic acid, acetic acid and propionic acid. 6. The method according to claim 1, wherein the precursor contains or is made from a compound of the formula Mx+F(x-δ)ByLd wherein M, F, x, y, δ and B are defined as in claim 1; L is a solvent, and d is ≦1. 7. The method according to claim 1, wherein step b is carried out at a temperature below the crystallisation point of the amorphous metal fluoride. 8. The method according to claim 1, wherein the precursor is prepared by providing the metal component of the precursor as an anhydrous metal compound, and reacting said metal component with anhydrous hydrogen fluoride. 9. The method according to claim 8, wherein said anhydrous compound is Mx+Bx, wherein M is selected from the group consisting of metals of the second, third and fourth main group and any sub group of the periodic table, B is a coordinately bound group, and x is any integer of 2 or 3. 10. The method according to claim 1, wherein the fluorinating agent is CHgClhF4-g-h with the sum of g+h being equivalent to 1 to 3. 11. The method according to claim 1, wherein the fluorinating agent is HF. 12. The method according to claim 1, wherein the amorphous metal fluoride is a catalyst. 13. A catalyst produced by a method according to claim 12. 14. An industrially producible catalyst according to claim 13, containing amorphous metal fluoride of the formula Mx+Fx-δ, wherein M is selected from the group consisting of metals of the second, third and fourth main group and any subgroup of the periodic table, x is any integer of 2 or 3, and δ is 0 to 0.1, which is catalytically active and has an active surface of about 100-300 m2/g. 15. The catalyst according to claim 14 which has an active surface of 180-280 m2/g. 16. A moisture resistant catalyst according to claim 13, containing amorphous metal fluoride of the formula Mx+Fx-δ, wherein M is selected from the group consisting of metals of the second, third and fourth main group and any subgroup of the periodic table, x is any integer of 2 or 3, and δ is 0 to 0.1. 17. The catalyst according to claim 13, wherein M is selected from the group consisting of Zn, Sn, Cu, Fe, Cr, V, Mg and Al. 18. The catalyst according to claim 17 wherein M has a charge of +2 or +3. 19. The catalyst according to claim 13, wherein M is a guest component of the catalyst. 20. The catalyst according to claim 13 wherein M is a host component of the catalyst. 21. The method according to claim 12 wherein said catalyst is a heterogeneous catalyst. 22. A method for the manufacture of a catalyst comprising amorphous metal fluoride of the formula Mx+Fx-δ, wherein M is selected from the group consisting of metals of the second, third and fourth main group and any subgroup of the periodic table, x is any integer of 2 or 3; and δ is 0 to 0.1, comprising the steps of the method according to claim 1, wherein the amorphous metal fluoride is the catalyst. 23. An amorphous metal fluoride produced by a method according to claim 1. 24. A catalyst comprising amorphous metal fluoride of the formula Mx+Fx-δ, wherein M is selected from the group consisting of metals of the second, third and fourth main group and any subgroup of the periodic table, x is any integer of 2 or 3; and δ is 0 to 0.1, which is catalytically active and has an active surface of about 100-300 m2/g. 25. A catalyst according to claim 24 containing a metal fluoride of the formula Mx+Fx-δ, wherein M is selected from the group consisting of metals of the second, third and fourth main group and any subgroup of the periodic table, x is any integer of 2 or 3; and δ is 0 to 0.1, which catalyst is essentially free of Cl. 26. The catalyst according to claim 24 which has an active surface of 180-280 m2/g.