40 Questions
What is the topology of the MOF structure with an octahedral node?
α-polonium
Which type of ligand can form 2D, 3D homo and bimetallic networks?
Oxalate
What is the dimensionality of MOFs based on benzene 1,4-dicarboxylate?
1D to 3D
What is the name of the MOF synthesized by Yaghi et al. in 2003?
MOF-5
What is the name of the acid commonly used in MOFs with polynuclear building nodes?
Benzene tricarboxylic acid
What is the term used to describe metal ions aggregated into clusters in MOFs?
Secondary Building Units
What is the name of the process introduced by Yaghi and co-workers to synthesize MOFs?
Reticular chemistry
What is the name of the SBU unit with a square paddle wheel structure?
Square paddle wheel [M2(COO)4]
What was the first report of gas sorption in MOFs in 1997?
[M2(bpy)3(NO3)4].xH2O (M=Co, Ni, Zn) for CH4, N2, O2 gases
What is the criterion for improvement in MOFs for gas sorption?
Interaction with the gas, interpenetration, doping, unsaturated metal sites and functionalization of ligands
What is the structure of ZIF (zeolitic imidazolate framework)?
Truncated octahedron connected in a cubic manner over six membered ring
What property is exhibited by MOF cationic framework with anions in the pores?
Anion exchange properties
What is the application of MOFs in separation?
Separation of linear and branched alkenes
Which MOF is used in cyanosilylation of aldehydes?
MIL-101 (Cr)
What is the application of MOFs in catalysis?
Oxidation of hydrocarbons
Who published a paper on asymmetric hydrogenation in MOFs in 2010?
Wenbin Lin
In Wells notation for uniform nets, what does the (n, p) notation represent?
n is the size of the smallest circuit and p is the connectivity of nodes
What is the Schläfli symbol of a dodecahedron?
{5,3}
Which one of these topologies is most common in 3D Metal-Organic Frameworks (MOFs)?
diamond and primitive cubic (alpha-Po)
Which compound represents a 2D sheet structure in MOFs with polypyridyl ligands?
[Zn(4,4’-bipyridine)2(H2O)2·SiF6]n
What is the key feature of reticular chemistry?
Linking of molecular building blocks using strong bonds
What is the connectivity of nodes in a honeycomb topology according to Wells notation?
3
Which molecular structure is described by MOF-2?
Layers of square topology connected by dinuclear Cu2+ paddle wheel SBUs
Which type of MOFs are connected by bridging nitrito in a layer-pillared 3D framework?
[M(pyz)2(NO2)]ClO4
What is the topology of the MOF-5 framework?
Primitive cubic (pcu) topology
What is the composition of the SBUs in MOF-5?
Octahedral Zn4O(—COO)6
What topology is exhibited by [Cu(bpy)2]PF6 in 3D MOFs?
Diamondoid
What is the main characteristic of the (6,3) honeycomb topology?
6 is the number of nodes in the shortest circuit and 3 is the connectivity
What can be used to expand the pore size in isoreticular MOFs?
Biphenyl, tetrahydropyrene, pyrene, and terphenyl
What are the different connectors mentioned in HKUST-1?
M3O and M4O Nodes
Which SBUs form the MOF: (MIL-88)?
M3O = V, Zn, Fe, Cr, and Cu
What describes the topology of high nuclearity building nodes in the provided text?
Hexanuclear prismatic nickel cluster SBUs
What type of polymeric nets are the most common interpenetrating 3D structures?
Diamondoid and alpha-polonium nets
Which type of porous structure is known for reversible loss and absorption of guest molecules without phase change?
2nd Generation
What is the best strategy to avoid interpenetration in porous structures?
Designing frameworks where interpenetration is forbidden
Which type of interpenetration is observed in MOF-5?
Two-fold interpenetration
Which of the following applications are relevant for porous CPs?
Gas storage and sensors
Which of the following describes a porous structure that can change in response to external stimuli?
3rd Generation
What type of porous structure has discrete cavities where guest molecules cannot pass out?
Dots (0D cavities)
Which of the following is an example of a structure with 3D intersecting channels?
MOF-5
Study Notes
MOFs with Carboxylate Ligands
- Oxalate ligands can form 2D and 3D homo and bimetallic networks depending on the choice of counter ions
- When the counterion is NR4+, 2D layers of hexagonal honeycomb are formed
MOFs with Benzene 1,4-Dicarboxylate
- Dimensionality: 1-3
- Form 1D to 3D porous networks
MOFs with Benzene Tricarboxylic Acids
- BTC, Benzene tricarboxylic acid, trimesic acid, e.g., HKUST-1
- Form porous multidimensional networks
- Flexible tripodal benzene-1,3,5-triacetic acid
MOFs with Polynuclear Building Nodes
- Introduction of metal clusters into MOFs leads to new functional solid-state materials
- Carboxylic acid ligands provide a wide range of rigid network due to their ability to aggregate metal ions into clusters termed as secondary building units (SBU)
- Common SBUs: square paddle wheel [M2(COO)4], octahedral basic zinc acetate cluster, trigonal prismatic oxo-centered trimers, trigonal planar
Dinuclear Building Nodes
- Square paddle wheel [Cu2(COO)4] SBUs are connected by ditopic BDC linkers to form layers of square topology
MOF-5
- Composed of octahedral Zn4O(—COO)6 SBUs, consisting of four tetrahedral ZnO4 units sharing a common vertex, joined by ditopic BDC linkers to give a 3D framework structure of primitive cubic (pcu) topology
- Open porous structure, with large cavities making up 61% of the unit cell volume and are filled with solvent molecules
Isoreticular MOFs
- Pore size can be expanded with the use of long linkers, such as biphenyl, tetrahydropyrene, pyrene, and terphenyl
MOF with Two Different Connectors
- Example: MOF with two different connectors, such as BTC and BDC
M3O and M4O Nodes (SBU)
- M3O nodes: trigonal prism joint, example: [Fe3O(COO)6]
- M4O nodes: octahedral joint, example: MOF-5, alpha-Po, stable up to 400°C and highly porous
High Nuclearity Building Nodes
- High nuclearity clusters can form MOF SBUs, example: [Ni6(OH)6(1,4-cdc)3(H2O)6], 2D structure, hexanuclear prismatic nickel cluster SBU
Function of Porous MOFs
- Gas sorption or storage, such as H2, CH4, and CO2
- Criteria for improvement: interaction with the gas, interpenetration, doping, unsaturated metal sites, and functionalization of ligands
Zeolitic Imidazolate Framework (ZIF)
- Sod: truncated octahedron, zinc(II) nitrate, and imidazolate-2-carboxyaldehyde (ICA)
- Aperture of 3.5 Å and a pore size of 11.2 Å
MOFs in Catalysis
- Catalysis, such as cyanosilylation of aldehydes, oxidation of hydrocarbons, oxidation of sulfides, and cycloaddition of CO2 and epoxides
MOF-5 and MIL-100
- MOF-5: alpha-Po, stable up to 400°C and highly porous
- MIL-100: Fe-based, catalytically active, and porous
MOF-101 (Cr)
- Cyanosilylation of aldehydes, oxidation of hydrocarbons, oxidation of sulfides, and cycloaddition of CO2 and epoxides
Activation of CO2
- MOFs can be used for the activation of CO2
Wells Notation
- Honeycomb: (6,3) topology
- Uniform net: (n,p) notation, where n is the size of the smallest circuit and p is the connectivity of nodes
Topology of Interpenetration
- Interpenetrating: two or more networks penetrate without connecting each other
3D MOFs
- Topologies: diamond, primitive cubic (alpha-Po), PtS, CdSO4, CaB6, NbO, and rutile
- Examples: MOF-2, MOF-5, and HKUST-1
This quiz covers the concepts of Wells notation, Schlafli symbol, and uniform/non-uniform nets in geometry, with a focus on polyhedra and their topology.
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