PMID:16075106
| Citation |
'Imaz, I, Bravic, G and Sutter, JP (2005) Structural and zeolitic features of a series of heterometallic supramolecular porous architectures based on tetrahedral {M(C2O4)4}4- primary building units. Dalton Trans ':2681-7 |
|---|---|
| Abstract |
The utilization of tetrahedral pre-formed coordination compounds {M(C2O4)4}4- (M = Zr(IV), U(IV); C2O4(2-) = oxalate) permitted the efficient construction of rare examples of heteronuclear supramolecular nano-porous architectures. A series of metal-organic coordination frameworks prepared by association of these building units with either Mn2+, Cd2+, or Mg2+ have been structurally characterized and are described. Their 3-D chemical scaffold is based on the primary tetrahedral building unit but their pore sizes and topologies could be varied through the M2+ metal ion involved in the assembling process, and the anionic tetrahedral moiety. These structures display channels with apertures up to 12 Angstrom x 8 Angstrom which are emptied of solvates at mild temperatures without affecting the chemical scaffold, the integrity of which is maintained up to 250-300 degrees C. A certain degree of flexibility of the coordination polymers upon guest release is suggested by the temperature dependence of the powder X-ray patterns and N2 sorption experiments, but reversible and selective sorption of small molecules has been observed substantiating that these open-frameworks behave like sponges. |
| Links |
PubMed Online version:10.1039/b503964a |
| Keywords |
Cadmium/chemistry; Crystallography, X-Ray; Macromolecular Substances/chemical synthesis; Macromolecular Substances/chemistry; Magnesium/chemistry; Manganese/chemistry; Models, Molecular; Organometallic Compounds/chemical synthesis; Organometallic Compounds/chemistry; Oxalates/chemistry; Porosity; Uranium/chemistry; Zeolites/chemistry; Zirconium/chemistry |
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