The method of claim 19, wherein the ligand L 'used is a di-, tri- or tetracarboxylic acid selected from the group consisting of: C 2 H 2 (CO 2 H) 2 (fumaric acid), C 2 H 4 (CO 2 H) 2 (succinic acid), C 3 H 6 (CO 2 H) 2 (glutaric acid), C 4 H 4 (CO 2 H) 2 (muconic acid), C 4 H 8 (CO 2 H) 2 (adipic acid), C 7 H 14 (CO 2 H) 2 (azelaic acid), C 5 H 3 S (CO 2 H) 2 (2,5-thiophenedicarboxylic acid), C 6 H 4 (CO 2 H) 2 (terephthalic acid), C 6 H 2 N 2 (CO 2 H) 2 (2,5-pyrazine dicarboxylic acid), C 10 H 6 (CO 2 H) 2 (naphthalene-2,6-dicarboxylic acid) , C 12 H 8 (CO 2 H) 2 (biphenyl-4,4'-dicarboxylic acid), C 12 H 8 N 2 (CO 2 H) 2 (azobenzenedicarboxylic acid), C 6 H 3 (CO 2 H) 3 (benzene-1,2,4-tricarboxylic acid), C 6 H 3 (CO 2 H) 3 (benzene-1,3,5-tricarboxylate), C 24 H 15 (CO 2 H) 3 (benzene 1,3,5-tribenzoic acid), C 6 H 2 (CO 2 H) 4 (benzene-1,2,4,5-tetracarboxylic acid, C 10 H 4 (CO 2 H) 4 (naphthalene-2,3,6,7-tetracarboxylic acid), C 10 H 4 (CO 2 H) 4 (naphthalene-1,4,5,8-tetracarboxylic acid), C 12 H 6 (CO 2 H) 4 0 C 220 0 C
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