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Four new 3D metal–organic frameworks constructed by the asymmetrical pentacarboxylate: gas sorption behaviour and magnetic properties.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 10/21/2016, Vol. 45 Issue 39, p15473-15480, 8p
- Publication Year :
- 2016
-
Abstract
- By using an asymmetrical rigid pentacarboxylic acid ligand, 2,4-di(3′,5′-dicarboxylphenyl)benzoic acid (H<subscript>5</subscript>L), four new three-dimensional (3D) metal–organic frameworks (MOFs), namely {[Cu<subscript>2</subscript>(HL)(H<subscript>2</subscript>O)<subscript>2</subscript>]·2DMF·2H<subscript>2</subscript>O}<subscript>n</subscript> (1), {[Co<subscript>2</subscript>(L)(DMA)]·H<subscript>2</subscript>N(Me)<subscript>2</subscript>}<subscript>n</subscript> (2), {[Co<subscript>2</subscript>(L)(H<subscript>2</subscript>O)]·H<subscript>2</subscript>N(Me)<subscript>2</subscript>}<subscript>n</subscript> (3), {[Mn<subscript>2</subscript>(L)(DMF)(H<subscript>2</subscript>O)]·H<subscript>2</subscript>N(Me)<subscript>2</subscript>}<subscript>n</subscript> (4), were solvothermally synthesized. H<subscript>5</subscript>L in 1–4 shows different coordination modes and can easily form various metal clusters (secondary building units, SBUs) in the final structures. 1 is a 3D porous framework with a (4,4)-connected pts topology based on the [Cu<subscript>2</subscript>(COO)<subscript>4</subscript>] paddlewheel SBU, wherein six SBUs are connected by twelve HL<superscript>4−</superscript> to get an unprecedented Cu<subscript>12</subscript> hendecahedron nanocage. 2–4 possess similar dinuclear [M<subscript>2</subscript>(COO)<subscript>5</subscript>] SBUs (M = Co, Mn), which are further extended by L<superscript>5−</superscript> to give rise to 3D frameworks with the uncommon (5,5)-connected nia-5,5-P2<subscript>1</subscript>/c and bnn topologies. In addition, the desolvated framework of 1 contains polar channels decorated with uncoordinated carboxylate groups, leading to selective adsorption for CO<subscript>2</subscript> over CH<subscript>4</subscript> at 195, 273 and 298 K. Moreover, the magnetic properties of 1–4 show that there exist antiferromagnetic interactions between metal ions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 45
- Issue :
- 39
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 118537846
- Full Text :
- https://doi.org/10.1039/c6dt02846b