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- Title
Three-Dimensional Co- and Mn-MOFs Containing a C<sub>2 h</sub>-Symmetric Terphenyl-3,3′-dicarboxylate Linker and Their Magnetic Properties.
- Authors
Kim, Hyun‐Chul; Gu, Ja‐Min; Kim, Youngmee; Lee, Do Nam; Huh, Seong
- Abstract
We report herein two new isostructural, three-dimensional (3D) MOFs with the general formula [M(3,3′-tpdc)(dmf)] [M = CoII ( I), MnII ( II)] resulting from the assembly of a metal ion and the C2 h-symmetric ditopic bridging ligand terphenyl-3,3′-dicarboxylate (3,3′-tpdc). Both isostructural MOFs crystallize in the monoclinic space group C2/ c. The metal ion is coordinated by four Ocarboxylate (η1:η1:µ2) and two µ2-Odmf atoms in a distorted octahedral geometry. The metal centers are interconnected through bridging 3,3′-tpdc and dmf ligands to form a 1D chain. The resulting 1D metal chains are further interconnected by 3,3′-tpdc ligands to form 3D frameworks without porosity. The thermolabile dmf bridging ligands were easily removed by heating at 180 °C under vacuum for 5 h. The activated MOFs I and II exhibited very low gas uptake of N2, CO2, and H2 after removal of the dmf bridging ligands. The encapsulation of iodine guest molecules by the activated I and II was also investigated. The crystal structure of iodine-encapsulated II was also elucidated. The coordination environment of the MnII atom in II changed as a result of the loss of dmf bridging ligands. The as-prepared MOFs I and II exhibit weak antiferromagnetic interactions in their 1D metal chains; these magnetic interactions should mainly occur between the metal ions bridged by the short carboxylate-based ligand and dmf oxygen atoms. Thermal removal of the bridging dmf molecules led to a change in the Mn ···Mn distances in the 1D chains of II that also affected its magnetic properties.
- Subjects
TERPHENYL; BRIDGING ligands; OCTAHEDRAL molecules; IODINATION; ANTIFERROMAGNETIC resonance
- Publication
European Journal of Inorganic Chemistry, 2016, Vol 2016, Issue 30, p4891
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201600645