Covalent organic frameworks with triazine units for iodine capture <i>via</i> weak molecular interactions

Niu, Qianyuan; Cui, Qingxue; Meng, Xutong; Zhang, Pei; Zhou, Yining; Hao, Fang; Ma, Buyong; Qin, Na; Zhai, Lipeng

doi:10.1039/d3nj00197k

“…55–60 Uncontrolled release of iodine, due to its volatility, toxicity and durability, could be a threat to the human metabolism and it may cause thyroid cancer, leukemia, and other diseases. 61–63 There are several feasible adsorbents, such as zeolites, 64–66 microporous polymers, 67–69 porous aromatic frameworks, 70–72 covalent organic frameworks (COFs), 73,74 hydrogen-bonded organic frameworks (HOFs), 75,76 chalcogenide aerogels, 77 metal–organic frameworks (MOFs) 78–84 and porous coordination polymers (PCPs) 85–87 which were used for the removal of I 2 . However, iodine capture studies by nonporous coordination polymers are still rare and require further investigation in more detail.…”

Section: Introductionmentioning

confidence: 99%

Reversible anion-dependent iodine uptake in nonporous pseudopolymorphic coordination polymers

Khorshidi,

Notash,

Kubicki

2024

CrystEngComm

2

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Eine Alkin‐verbrückte kovalent organische Gerüstverbindung mit interaktiven Bindungstaschen für das Einfangen von Brom

De,

Haldar,

Schmidt

et al. 2024

Angewandte Chemie

0

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The high degree of corrosivity and reactivity of bromine, which is released from various sources poses a serious threat to the environment. Moreover, its coexistence with iodine forming an equilibrium compound, iodine monobromide (IBr) necessitates the selective capture of bromine from halogen mixtures. The electrophilicity of halogens to π‐electron rich structures enabled us to strategically design a covalent organic framework for halogen capture, featuring a defined pore environment with localized sorption sites. The higher capture capacity of bromine (4.6 g g‐1) over iodine by ~41 % shows its potential in selective capture. Spectroscopic results uncovering the preferential interaction sites are supported by theoretical investigations. The alkyne bridge is a core functionality promoting the selectivity in capture by synergistic physisorption, rationalized by the higher orbital overlap of bromine due to its smaller atomic size as well as reversible chemical interactions. The slip stacking in the structure has further promoted this phenomenon by creating clusters of molecular interaction sites with bromine intercalated between the layers. The inclusion of unsaturated moieties, i.e. triple bonds and the complementary pore geometry offer a promising design strategy for the construction of porous materials for halogen capture.

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An Alkyne‐Bridged Covalent Organic Framework Featuring Interactive Pockets for Bromine Capture

De,

Haldar,

Schmidt

et al. 2024

Angew Chem Int Ed

4

0

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The high degree of corrosivity and reactivity of bromine, which is released from various sources poses a serious threat to the environment. Moreover, its coexistence with iodine forming an equilibrium compound, iodine monobromide (IBr) necessitates the selective capture of bromine from halogen mixtures. The electrophilicity of halogens to π‐electron rich structures enabled us to strategically design a covalent organic framework for halogen capture, featuring a defined pore environment with localized sorption sites. The higher capture capacity of bromine (4.6 g g‐1) over iodine by ~41 % shows its potential in selective capture. Spectroscopic results uncovering the preferential interaction sites are supported by theoretical investigations. The alkyne bridge is a core functionality promoting the selectivity in capture by synergistic physisorption, rationalized by the higher orbital overlap of bromine due to its smaller atomic size as well as reversible chemical interactions. The slip stacking in the structure has further promoted this phenomenon by creating clusters of molecular interaction sites with bromine intercalated between the layers. The inclusion of unsaturated moieties, i.e. triple bonds and the complementary pore geometry offer a promising design strategy for the construction of porous materials for halogen capture.

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Covalent organic frameworks with triazine units for iodine capture via weak molecular interactions

Abstract: The radioactive iodine in nuclear waste has become a unignorable problem of environmental pollution. In this work, two covalent organic frameworks (T-COF-1 and T-COF-2) with triazine units were synthesized for...

Cited by 8 publications

References 42 publications

Reversible anion-dependent iodine uptake in nonporous pseudopolymorphic coordination polymers

Reversible anion-dependent iodine uptake in nonporous pseudopolymorphic coordination polymers

Eine Alkin‐verbrückte kovalent organische Gerüstverbindung mit interaktiven Bindungstaschen für das Einfangen von Brom

An Alkyne‐Bridged Covalent Organic Framework Featuring Interactive Pockets for Bromine Capture

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