A 2D Mesoporous Imine‐Linked Covalent Organic Framework for High Pressure Gas Storage Applications

Rabbani, Mohammad Gulam; Sekizkardes, Ali K.; Kahveci, Zafer; Reich, Thomas E.; Ding, Ransheng; El‐Kaderi, Hani M.

doi:10.1002/chem.201203753

Cited by 402 publications

(280 citation statements)

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“…These materials showcase promising applications in the field of gas storage [2][3][4][5] , opto-electronics 6 , catalysis [7][8][9] and sensing 10 because of their crystalline and periodic structure with high surface area and thermal stability. COFs are usually synthesized as microcrystalline powders and their long-range growth is limited in the nano/micro domain due to the internal defects [11][12][13] .…”

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confidence: 99%

Self-templated chemically stable hollow spherical covalent organic framework

et al. 2015

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Covalent organic frameworks are a family of crystalline porous materials with promising applications. Although active research on the design and synthesis of covalent organic frameworks has been ongoing for almost a decade, the mechanisms of formation of covalent organic frameworks crystallites remain poorly understood. Here we report the synthesis of a hollow spherical covalent organic framework with mesoporous walls in a single-step template-free method. A detailed time-dependent study of hollow sphere formation reveals that an inside-out Ostwald ripening process is responsible for the hollow sphere formation. The synthesized covalent organic framework hollow spheres are highly porous (surface area B1,500 m 2 g À 1 ), crystalline and chemically stable, due to the presence of strong intramolecular hydrogen bonding. These mesoporous hollow sphere covalent organic frameworks are used for a trypsin immobilization study, which shows an uptake of 15.5 mmol g À 1 of trypsin.

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confidence: 99%

Self-templated chemically stable hollow spherical covalent organic framework

et al. 2015

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“…However, the polymer P(PIOH-IPI) has a sharp weight loss around 100 °C, which can be attributed to the presence of water molecules coordinated to the OH-sites in the polymer chain. This assumption was supported by the elemental analysis results, which indicated the coordination of at least two water molecules to the polymer chain [22,23].…”

Section: Results and Discussion Synthesis And Characterization And Phymentioning

confidence: 65%

Investigation of the Electronic and pH-Sensing properties of Hydroxyl-Functionalized Imine-Linked Polymers via the UV-vis Absorption Spectra and the Density Functional Theory (DFT) Calculations

Aljaafreh

Altarawneh

Alomari

et al. 2017

J. Pure App. Chem. Res.

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In this report, a synergetic computational and experimental studies were demonstrated on examples of poly-imine polymers; P(PI-IPI) and P(PIOH-IPI) to explore the role of hydroxyl substituent on their sensing and electronic properties. The polymer P(PIOH-IPI) bearing the OH-group on the ortho-position to the imine-bond, while the structure of the polymer P(PI-IPI) reveal the imine-bond only. The sensing property of the polymers was investigated via the UV-vis absorption in different solvents, acidic and basic solutions. Both polymers have shown significant sensing behavior in the acidic medium, while unpronounced behavior was noticed in the case of the polymer P(PI-IPI) in basic medium. Upon the incorporation of the OH-group, the polymer P(PIOH-IPI) has indistinguishable sensing behavior, a similar blue-shift in the acidic and basic medium, which can be attributed to the presence and the position of OH-group. The optical band gap of the polymers was determined experimentally and theoretically from the UV-vis absorption spectra and DFT calculations in the DMSO solvent. Other factors that affect the band gap values such as the structural conformation and length of conjugation were explored theoretically. In general, as the length of the optimized chain increased, the spectrum is red-shifted and the band gap decreased, which is attributed to the possible loss of chain planarity and conjugation beyond the monomer structure. Interestingly, the UV-vis spectra of the monomer-optimized structures were in a good match with the experimental UV-vis spectra. However, the band gap difference can be attributed to the method of band gap determination.Key word: Sensing, Functionalization, conformation, Length of conjugation, DFT, UV-vis INTRODUCTIONImine-linked polymers (ILPs) are organic conjugated polymers that gained significant importance due to their vital applications in the fields of catalysis, sensing, gas sorption, electronic and optoelectronic devices, sensors and other more applications [1][2][3][4][5][6][7]. The multifunctional properties of ILPs are related to their selective structural design which, exhibit an extended conjugated backbone accessible for functionalization and free nitrogen sites available for protonation and metal ion-coordination [3,8,9].As example, ILPs-based polymers such as C3v-POF and Th-POF were synthesized as Cu-and Ir-coordinated polymers and used as catalysts in the hydrogenation and cyclopropanation reactions, while other ILPs were used as Suzuki coupling catalysts [9][10][11].

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“…These organic networks are, due to their large surface areas, of interest in gas storage [6], gas separation [7] and catalysis [8–10]. For the synthesis of organic networks, many different reaction types such as condensation reactions [11–12], coupling reactions [3] and click reactions [5,13] have been reported. Herein we present the synthesis of porous, three-dimensional tetraphenylmethane-based networks by another click reaction, the thiol–yne reaction [14–19].…”

Section: Introductionmentioning

confidence: 99%