scholarly journals Two-dimensional metal-organic frameworks containing linear dicarboxylates

2006 ◽  
Vol 62 (5) ◽  
pp. 808-814 ◽  
Author(s):  
Samuel M. Hawxwell ◽  
Harry Adams ◽  
Lee Brammer
Keyword(s):  
Dicarboxylic Acid ◽  
Solvothermal Synthesis ◽  
Interplanar Spacing ◽  
Metal Organic Frameworks ◽  
Dicarboxylic Acids ◽  
Two Dimensional ◽  
Secondary Building Units ◽  
Metal Organic ◽  
Gas Molecules ◽  
Solvent Molecules

The solvothermal synthesis of four two-dimensional metal-organic frameworks containing linear dicarboxylic acids as ligands for ZnII centres is described. Zn(BDC)(DMF) [(1) where BDC = benzene-1,4-dicarboxylic acid; DMF = N,N-dimethylformamide] adopts a common paddlewheel motif leading to a 44 grid network, whereas Zn3(BDC)3(EtOH)2 (2), Zn3(BDC)3(H2O)2·4DMF (3) and Zn3(BPDC)3(DMF)2·4DMF (4) each form networks with the relatively uncommon 36 topology based upon Zn3(O2CR)6 secondary building units. All contain coordinated solvent molecules, namely DMF [(1) and (4)], ethanol (2) or H2O (3). Comparison of structures (2) and (3) illustrates a clay-like flexibility in interplanar spacing which sheds light on the ability of the Zn3(BDC)3 framework to undergo desolvation and uptake of small solvent and gas molecules.

scholarly journals Chiral porous metal-organic frameworks with dual active sites for sequential asymmetric catalysis

2012 ◽  
Vol 468 (2143) ◽  
pp. 2035-2052 ◽  
Author(s):  
Feijie Song ◽  
Teng Zhang ◽  
Cheng Wang ◽  
Wenbin Lin
Keyword(s):  
Asymmetric Catalysis ◽  
Active Sites ◽  
Metal Organic Frameworks ◽  
Porous Metal ◽  
Dicarboxylic Acids ◽  
Great Promise ◽  
Epoxide Ring ◽  
Potential Applications ◽  
Secondary Building Units ◽  
Metal Organic

Metal-organic frameworks (MOFs) are a class of organic–inorganic hybrid materials built from metal-connecting nodes and organic-bridging ligands. They have received much attention in recent years owing to the ability to tune their properties for potential applications in various areas. Properly designed MOFs with uniform, periodically aligned active sites have shown great promise in catalysing shape-, size-, chemo-, regio- and stereo-selective organic transformations. This study reports the synthesis and characterization of two chiral MOFs (CMOFs 1 and 2 ) that are constructed from Mn-salen-derived dicarboxylic acids [salen is ( R , R )- N , N ′-bis(5- tert -butylsalicylidene)-1,2-cyclohexanediamine], bis(4-vinylbenzoic acid)-salen manganese(III) chloride (H 2 L 4 ) or bis(benzoic acid)-salen manganese(III) chloride (H 2 L 3 ) and [Zn 4 (μ 4 -O)(O 2 CR) 6 ] or [Zn 5 (H 2 O) 2 (μ 3 -OH) 2 (O 2 CR) 8 ] secondary building units (SBUs), respectively. The SBUs in CMOF- 1 are connected by the linear ditopic Mn-salen-derived linkers to construct a fourfold interpenetrated isoreticular MOF (IRMOF) structure with pcu topology. In CMOF- 2 , the Mn-salen centres dimerize in a cross-linking way to form a diamondoid structure with threefold interpenetration. CMOF- 1 was examined for highly regio- and stereo-selective tandem alkene epoxidation/epoxide ring-opening reactions by using the Mn-salen andZn 4 (μ 4 -O)(carboxylate) 6 active sites, respectively. Our work demonstrated the potential utility of chiral MOFs with multiple active sites in the efficient synthesis of complex molecules with excellent regio- and stereo-controls

New two-dimensional metal–organic frameworks constructed from 1H-benzimidazole-5,6-dicarboxylic acid with luminescent studies

2012 ◽  
Vol 384 ◽  
pp. 105-110 ◽  
Author(s):  
Wei Wang ◽  
Jia-Yin Sun ◽  
Dao-Jun Zhang ◽  
Tian-You Song ◽  
Wei Song ◽  
...  
Keyword(s):  
Dicarboxylic Acid ◽  
Metal Organic Frameworks ◽  
Two Dimensional ◽  
Metal Organic

scholarly journals 2D Porphyrinic Metal-Organic Frameworks Featuring Rod-Shaped Secondary Building Units

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2955
Author(s):  
Rory Elliott ◽  
Aoife A. Ryan ◽  
Aviral Aggarwal ◽  
Nianyong Zhu ◽  
Friedrich W. Steuber ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Metal Organic Frameworks ◽  
Gas Storage ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molecular Separation ◽  
Potential Applications ◽  
Secondary Building Units ◽  
Metal Organic ◽  
Solvent Molecules

Metal-organic frameworks (MOFs) encompass a rapidly expanding class of materials with diverse potential applications including gas storage, molecular separation, sensing and catalysis. So-called ‘rod MOFs’, which comprise infinitely extended 1D secondary building units (SBUs), represent an underexplored subclass of MOF. Further, porphyrins are considered privileged ligands for MOF synthesis due to their tunable redox and photophysical properties. In this study, the CuII complex of 5,15-bis(4-carboxyphenyl)-10,20-diphenylporphyrin (H2L-CuII, where H2 refers to the ligand’s carboxyl H atoms) is used to prepare two new 2D porphyrinic rod MOFs PROD-1 and PROD-2. Single-crystal X-ray analysis reveals that these frameworks feature 1D MnII- or CoII-based rod-like SBUs that are coordinated by labile solvent molecules and photoactive porphyrin moieties. Both materials were characterised using infrared (IR) spectroscopy, powder X-ray diffraction (PXRD) spectroscopy and thermogravimetric analysis (TGA). The structural attributes of PROD-1 and PROD-2 render them promising materials for future photocatalytic investigations.

scholarly journals Metal-Organic Frameworks: Synthetic Methods and Potential Applications

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 310
Author(s):  
Catherine P. Raptopoulou
Keyword(s):  
Metal Organic Frameworks ◽  
Structural Diversity ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Synthetic Methods ◽  
High Porosity ◽  
Potential Applications ◽  
Metal Organic ◽  
Gas Molecules ◽  
Solvent Molecules

Metal-organic frameworks represent a porous class of materials that are build up from metal ions or oligonuclear metallic complexes and organic ligands. They can be considered as sub-class of coordination polymers and can be extended into one-dimension, two-dimensions, and three-dimensions. Depending on the size of the pores, MOFs are divided into nanoporous, mesoporous, and macroporous items. The latter two are usually amorphous. MOFs display high porosity, a large specific surface area, and high thermal stability due to the presence of coordination bonds. The pores can incorporate neutral molecules, such as solvent molecules, anions, and cations, depending on the overall charge of the MOF, gas molecules, and biomolecules. The structural diversity of the framework and the multifunctionality of the pores render this class of materials as candidates for a plethora of environmental and biomedical applications and also as catalysts, sensors, piezo/ferroelectric, thermoelectric, and magnetic materials. In the present review, the synthetic methods reported in the literature for preparing MOFs and their derived materials, and their potential applications in environment, energy, and biomedicine are discussed.

Flexible and rigid dicarboxylic acids enable the assembly of achiral and chiral 3D Co(ii) metal–organic frameworks

2018 ◽  
Vol 47 (20) ◽  
pp. 6917-6923 ◽  
Author(s):  
Chunhua Gong ◽  
Haiyang Guo ◽  
Xianghua Zeng ◽  
Hao Xu ◽  
Qingdao Zeng ◽  
...  
Keyword(s):  
Dicarboxylic Acid ◽  
Metal Organic Frameworks ◽  
Dicarboxylic Acids ◽  
Acid Ligand ◽  
Phenyl Rings ◽  
Metal Organic

The homochirality of the 3D Co(ii) MOFs may arise from the rotation of the two phenyl rings in the biphenyl-4,4′-dicarboxylic acid ligand.

Four cobalt(ii) coordination polymers with diverse topologies derived from flexible bis(benzimidazole) and aromatic dicarboxylic acids: syntheses, crystal structures and catalytic properties

RSC Advances ◽  
2014 ◽  
Vol 4 (106) ◽  
pp. 61281-61289 ◽  
Author(s):  
Xiao Xiao Wang ◽  
Baoyi Yu ◽  
Kristof Van Hecke ◽  
Guang Hua Cui
Keyword(s):  
Dicarboxylic Acid ◽  
Crystal Structures ◽  
Coordination Polymers ◽  
Catalytic Properties ◽  
Hydrothermal Reaction ◽  
Metal Organic Frameworks ◽  
Dicarboxylic Acids ◽  
Metal Organic ◽  
Aromatic Dicarboxylic Acids

Four metal–organic frameworks (MOFs) were obtained from the hydrothermal reaction of Co(ii) and with dicarboxylic acid and flexible bis(5,6-dimethylbenzimidazole) and characterized. The four MOFs exhibit distinct 2D or 3D structural frameworks.

scholarly journals A Metal-organic Framework with Paddle-wheel Zn2(CO2)4 Secondary Building Units and Cubane-1,4-dicarboxylic Acid Linkers

2019 ◽  
Author(s):  
Dávid Földes ◽  
Éva Kováts ◽  
Gábor Bortel ◽  
Emma Jakab ◽  
Sándor Pekker
Keyword(s):  
Crystal Structure ◽  
Dicarboxylic Acid ◽  
Metal Organic Framework ◽  
Inert Atmosphere ◽  
Square Lattice ◽  
Two Dimensional ◽  
Paddle Wheel ◽  
Underlying Network ◽  
Secondary Building Units ◽  
Solvent Molecules

A new crystal structure of catena-(bis((µ4-cubane-1,4-dicarboxylato)-(N-methyl-2-pyrrolidone)-zinc(II)) N-methyl-2-pyrrolidone solvate) (1) was prepared by solvothermal method. The crystal structure of the compound was analyzed by single-crystal X-ray diffraction. It has a P1 space group, with lattice parameters a = 10.7190(4) Å, b = 10.8245(5) Å, c = 10.8403(8) Å, α = 80.291(5)°, β = 70.0015(5)°, γ = 77.531(4)°, V = 1147.97(12) Å3. The secondary building units of 1 consist of 2 central Zn ions, coordinated by 4 carboxylate groups in a bis-monodentate way, forming a square planar configuration of Zn2(CO2)4, known as paddle-wheel units. The paddle-wheels are connected by cubane-1,4-dicarboxylic acid linkers at the edges, resulting in a two-dimensional coordination polymer with a square lattice (sql) underlying network topology. The axial sites of the zinc atoms are occupied by N-methyl-2-pyrrolidone molecules. In this new crystal structure the two-dimensional polymer planes are interstacked by weak dispersion bonds. The axial N-methyl-2-pyrrolidone solvent molecules determine the distances of planar polymer planes. The thermal properties of this new structure were studied by thermogravimetry/mass spectrometry in inert atmosphere. It was found, that the organic linkers in the framework structure do not decompose below 200 °C. The stochiometry of the activated compound is Zn2[C8H6(COO)2]2(C5H9NO)2, as determined by thermogravimetry in oxidative atmosphere.

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