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Molecules
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Covalent Organic Frameworks and Related Porous Organic Materials
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Covalent Organic Frameworks and Related Porous Organic Materials

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Organic Chemistry".

Deadline for manuscript submissions: closed (31 May 2017) | Viewed by 40771

Special Issue Editors

Dr. Felipe Gándara

E-Mail Website
Guest Editor
Department of New Architectures in Materials Chemistry, Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), Sor Juana Inés de la Cruz 3, Cantoblanco, Madrid, Spain
Interests: synthesis and structural analysis of porous materials, such as metal-organic frameworks and covalent organic framework; use of porous materials in clean energy applications, including heterogeneous catalysis or gas storage
Dr. Praveen Thallapally

E-Mail Website
Guest Editor
Pacific Northwest National Laboratory, Physical and Computational Sciences Directorate, Richland WA, USA
Interests: design and synthesis of heirarchical porous framework materials (MOFs, COFs, PAFs and POPs) for applications in separation, catalysis and storage

Special Issue Information

Dear Colleagues,

Covalent organic frameworks (COFs) are a class of materials that exhibit crystalline, porous structures. They are built through the formation of strong covalent bonds between rigid organic building blocks, which are judiciously selected based on their geometry and chemical functionalities to produce frameworks with desired structural features. COFs might be prepared with the use of various organic condensation reactions, and they have found application in many fields of interest, such as gas storage, toxic gas capture, optoelectronics, or catalysis, among others. Furthermore, COFs have inspired the development of other porous organic materials with extended structures, which despite lacking crystallinity, they have interesting properties arising from the choice of their building components, the type of chemical bond that they form, or presence of chemical functionalities that decorate their pores. This Special Issue aims to cover different aspects of the chemistry of COFs and related porous organic materials, ranging from the study of synthetic methodologies, structural design, chemical modification, or evaluation of their properties.

Dr. Felipe Gándara
Dr. Praveen Thallapally
Guest Editors

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • porous materials
  • structural design
  • organic materials
  • gas sorption
  • optoelectronics
  • heterogeneous catalysis

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Published Papers (3 papers)

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Research

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1661 KiB  
Article
BILP-19—An Ultramicroporous Organic Network with Exceptional Carbon Dioxide Uptake
by Christoph Klumpen, Florian Radakovitsch, Andreas Jess and Jürgen Senker
Molecules 2017, 22(8), 1343; https://doi.org/10.3390/molecules22081343 - 12 Aug 2017
Cited by 13 | Viewed by 6957
Abstract
Porous benzimidazole-based polymers (BILPs) have proven to be promising for carbon dioxide capture and storage. The polarity of their chemical structure in combination with an inherent porosity allows for adsorbing large amounts of carbon dioxide in combination with high selectivities over unpolar guest [...] Read more.
Porous benzimidazole-based polymers (BILPs) have proven to be promising for carbon dioxide capture and storage. The polarity of their chemical structure in combination with an inherent porosity allows for adsorbing large amounts of carbon dioxide in combination with high selectivities over unpolar guest molecules such as methane and nitrogen. For this reason, among purely organic polymers, BILPs contain some of the most effective networks to date. Nevertheless, they are still outperformed by competitive materials such as metal-organic frameworks (MOFs) or metal doped porous polymers. Here, we report the synthesis of BILP-19 and its exceptional carbon dioxide uptake of up to 6 mmol•g−1 at 273 K, making the network comparable to state-of-the-art materials. BILP-19 precipitates in a particulate structure with a strongly anisotropic growth into platelets, indicating a sheet-like structure for the network. It exhibits only a small microporous but a remarkable ultra-microporous surface area of 144 m2•g−1 and 1325 m2•g−1, respectively. We attribute the exceptional uptake of small guest molecules such as carbon dioxide and water to the distinct ultra-microporosity. Additionally, a pronounced hysteresis for both guests is observed, which in combination with the platelet character is probably caused by an expansion of the interparticle space, creating additional accessible ultra-microporous pore volume. For nitrogen and methane, this effect does not occur which explains their low affinity. In consequence, Henry selectivities of 123 for CO2/N2 at 298 K and 12 for CO2/CH4 at 273 K were determined. The network was carefully characterized with solid-state nuclear magnetic resonance (NMR) and infrared (IR) spectroscopy, thermal gravimetry (TG) and elemental analyses as well as physisorption experiments with Ar, N2, CO2, CH4 and water. Full article
(This article belongs to the Special Issue Covalent Organic Frameworks and Related Porous Organic Materials)
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Review

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4933 KiB  
Review
Crystallization of Covalent Organic Frameworks for Gas Storage Applications
by Lijuan Zhu and Yue-Biao Zhang
Molecules 2017, 22(7), 1149; https://doi.org/10.3390/molecules22071149 - 10 Jul 2017
Cited by 139 | Viewed by 22468
Abstract
Covalent organic frameworks (COFs) have emerged as a new class of crystalline porous materials prepared by integrating organic molecular building blocks into predetermined network structures entirely through strong covalent bonds. The consequently encountered “crystallization problem” has been conquered by dynamic covalent chemistry in [...] Read more.
Covalent organic frameworks (COFs) have emerged as a new class of crystalline porous materials prepared by integrating organic molecular building blocks into predetermined network structures entirely through strong covalent bonds. The consequently encountered “crystallization problem” has been conquered by dynamic covalent chemistry in syntheses and reticular chemistry in materials design. In this contribution, we have reviewed the progress in the crystallization of COF materials and their hydrogen, methane and carbon dioxide gas storage properties for clean energy applications. Full article
(This article belongs to the Special Issue Covalent Organic Frameworks and Related Porous Organic Materials)
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Other

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1461 KiB  
Perspective
Covalent Organic Frameworks—Organic Chemistry Beyond the Molecule
by Christian S. Diercks, Markus J. Kalmutzki and Omar M. Yaghi
Molecules 2017, 22(9), 1575; https://doi.org/10.3390/molecules22091575 - 19 Sep 2017
Cited by 35 | Viewed by 10318
Abstract
The synthesis of organic molecules has at its core, purity, definitiveness of structure, and the ability to access specific atoms through chemical reactions. When considering extended organic structures, covalent organic frameworks (COFs) stand out as a true extension of molecular organic chemistry to [...] Read more.
The synthesis of organic molecules has at its core, purity, definitiveness of structure, and the ability to access specific atoms through chemical reactions. When considering extended organic structures, covalent organic frameworks (COFs) stand out as a true extension of molecular organic chemistry to the solid state, because these three fundamental attributes of molecular organic chemistry are preserved. The fact that COFs are porous provides confined space within which molecules can be further modified and controlled. Full article
(This article belongs to the Special Issue Covalent Organic Frameworks and Related Porous Organic Materials)
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