[0001] The invention relates to novel Metal Organic Frameworks (MOFs) comprising a modified UiO-66-NH<2>, which consist of a N-cycloalkyl functionalized UiO-66-NH<2>. The invention also relates to the procedure to prepare them and the use thereof as a photocatalysts.
1. A metal-organic framework (MOF) comprising N-cycloalkyl functionalized UiO-66-NH<2> wherein the cycloalkyl substituent is selected from cyclopentyl and cyclohexyl. 2. A metal-organic framework, according to claim 1, comprising N-cyclopentyl functionalized UiO-66-NH<2> 3. A metal-organic framework, according to claim 1 or 2, comprising a micropore volume from 35 to 60 % wherein the micropores have a diameter size between 1.0-1.5 nm. 4. A metal-organic framework, according to any of claims 1 to 3, having a BET surface area from 300 to 700 m<2>·g<-1>. 5. Procedure to prepare the metal-organic framework described in any of previous claims, that comprises the next steps: a) synthesis of N-cycloalkyl-2-aminoterephthalate dimethyl ester by contacting 2-aminoterephthalate dimethyl ester with the corresponding cyclic ketone: cyclopentanone or cyclohexanone, in presence of trimethylsilyl chloride (TMSCI), adding NaBH<4> at 0 ºC to the mixture of reaction and , after 2 to 10 min of the addition of NaBH<4>, warming up said mixture to room temperature and maintaining the mixture at said temperature for 2 to 4 h, b) synthesis of N-cycloalkyl-2-aminoterephthalic acid by treating the N-cycloalkyl-2-aminoterephthalate dimethyl ester obtained in step a) with NaOH at a temperature between 60 and 80 ºC for 6-10 h; the mixture was concentrated to remove the solvent, the resulting mixture is acidified, and the precipitate formed, which contains the N-cycloalkyl-2-aminoterephthalic acid, is collected, c) synthesis of the N-cycloalkyl-amino functionalized UiO-66-NH<2> by contacting the N-cycloalkyl-2-aminoterephthalic acid obtained in step b) with ZrOCl<2>·8 H<2>O in presence of acetic acid and HCI in a vessel hermetically closed and heated at a temperature between 130 and 150 ºC for 14-20 h. 6. Procedure, according to claim 5, wherein, DMF is used as a solvent in step a) and/or in step b). 7. Procedure, according to claim 5 or 6, wherein the step b) is carried out at 70 °C and/or for 8 h. 8. Procedure, according to any of previous claims 5 to 7, wherein, in step b), the mixture is acidified until pH 3. 9. Procedure, according to any of previous claims 5 to 8, wherein the precipitate in step b) is isolated by filtration, washed with water, and dried. 10. Procedure according to any of previous claims 5 to 9, wherein step c) is carried out at 140 ºC and/or for 16 h. 11. Procedure according to any of previous claims 5 to 10, wherein for each mmol of 2-aminoterephthalate dimethyl ester used in step a), between 1 and 2mmol of cyclic ketone and/or between 2 and 3 mmol of trimethylsilyl chloride (TMSCI) and/or between 1 and 1.5 mmol of NaBH<4> are used. 12. Use of the metal-organic framework described in any of claims 1 to 4, as a photocatalyst. 13. Use according to claim 12 in the degradation of organic contaminants in water. 14. Use according to claim 13 wherein the degradation is carried out in presence of solar light as an energy source. 15. Use according to claim 13 or 14 wherein the organic contaminant is acetaminophen.