Role of Temperature on Framework Dimensionality: Supramolecular Isomers of Zn3(RCOO)8 Based Metal Organic Frameworks
journal contributionposted on 01.02.2012 by Sanjog S. Nagarkar, Abhijeet K. Chaudhari, Sujit K. Ghosh
Any type of content formally published in an academic journal, usually following a peer-review process.
Three new anionic metal organic frameworks, [Zn1.5(FDA)2(Me2NH2)]·xG (1), [Zn3(FDA)4(Me2NH2)2]·xG (2), and [Zn1.5(FDA)2(Me2NH2)]·xG (3) (FDAH2 = 2,5-furandicarboxylic acid, G = guest), were synthesized solvothermally via a temperature tuning strategy. Compound 1, synthesized at 90 °C, has a two-dimensional (2D) sheet structure, while 2 and 3, synthesized at 120 and 160 °C, respectively, have three-dimensional (3D) structures. Compound 2 has alternating hydrophobic and hydrophilic channels with pore dimensions ∼4.3 × 4.4 Å2 and ∼5.6 × 6.2 Å2, respectively. Compound 3 has only one type of pore with dimensions of ∼5.3 × 6.2 Å2. All three compounds have eight connected Zn3(RCOO)8 nodes as building units and are anionic, with dimethyl ammonium cations present inside the channels to balance charge. Compounds 1, 2, and 3 are supramolecular isomers with general formula [Zn1.5(FDA)2(Me2NH2)]n.