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Chemical and Thermal Stability of Isotypic Metal–Organic Frameworks: Effect of Metal Ions
Author(s) -
Kang In Joong,
Khan Nazmul Abedin,
Haque Enamul,
Jhung Sung Hwa
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201100316
Subject(s) - thermal stability , metal , metal organic framework , chemical stability , metal ions in aqueous solution , porosity , chemistry , inorganic chemistry , chemical engineering , materials science , organic chemistry , adsorption , engineering
Chemical and thermal stabilities of isotypic metal–organic frameworks (MOFs) like Al‐BDC (Al‐benzenedicarboxylate called MIL‐53‐Al), Cr‐BDC (MIL‐53‐Cr) and V‐BDC (MIL‐47‐V), after purification to remove uncoordinated organic linkers, have been compared to understand the effect of the central metal ions on the stabilities of the porous MOF‐type materials. Chemical stability to acids, bases, and water decreases in the order of Cr‐BDC>Al‐BDC>V‐BDC, suggesting stability increases with increasing inertness of the central metal ions. However, thermal stability decreases in the order of Al‐BDC>Cr‐BDC> V‐BDC, and this tendency may be explained by the strength of the metal–oxygen bond in common oxides like Al 2 O 3 , Cr 2 O 3 , and V 2 O 5 . In order to evaluate precisely the stability of a MOF, it is necessary to remove uncoordinated organic linkers that are located in the pores of the MOF, because a filled MOF may be more stable than the same MOF after purification.