3967-54-2Relevant articles and documents
A water-stable metal-organic framework: serving as a chemical sensor of PO4 3– and a catalyst for CO2 conversion
Zhai, Bin,Xu, Hang,Li, Zhong-Yi,Cao, Chun-Shuai,Zhao, Bin
, p. 1328 - 1333 (2017)
A new 2D Eu-BTB framework (1) with stratified gridding structure of about 14.6 ?×16.9 ? was synthesized and characterized. Compound 1 displays excellent water stability with the pH 2–12. The luminescent investigations suggest that 1 could represent a chemical sensor of PO4 3- with high sensitivity and selectivity. Importantly, 1 as a sensor of PO4 3- can be reused at least five times. On the other hand, the catalytic investigations of 1 were carried out, indicating that 1 could be demonstrated as a recyclable catalyst for CO2 conversion with epoxides.
A Bifunctional Europium-Organic Framework with Chemical Fixation of CO2 and Luminescent Detection of Al3+
Xu, Hang,Zhai, Bin,Cao, Chun-Shuai,Zhao, Bin
, p. 9671 - 9676 (2016)
A novel three-dimensional lanthanide-organic framework {[Eu(BTB)(phen)]·4.5DMF·2H2O}n (1) has been synthesized. Structural characterization suggests that framework 1 possesses one-dimensional channels with potential pore volume, and the large channels in the framework can capture CO2. Interestingly, investigations on the cycloaddition reaction of CO2 and epoxides reveal that compound 1 can be considered as an efficient catalyst for CO2 fixation with epoxides under 1 atm pressure. Importantly, 1 can be reused at least five times without any obvious loss in catalytic activity. Furthermore, the luminescent explorations of 1 reveal that 1 can act as a recyclable sensor of Al3+, and the corresponding detection limit can reach 5 × 10-8 M (1.35 ppb), which is obviously lower than the United States Environmental Protection Agency's recommended level of Al3+ in drinking water (200 ppb). These results show that 1 has a level of sensitivity higher than that of other reported MOF-based sensors of Al3+.
Nanochannel-based heterometallic {ZnIIHoIII}-organic framework with high catalytic activity for the chemical fixation of CO2
Zhang, Tao,Chen, Hongtai,Lv, Hongxiao,Li, Qiaoling,Zhang, Xiutang
, p. 9731 - 9739 (2021)
The exquisite combination of ZnIIand HoIIIgenerated the highly robust [ZnHo(CO2)6(OH2)]-based heterometallic framework of {[ZnHo(TDP)(H2O)]·5H2O·3DMF}n(NUC-30, H6TDP = 2,4,6-tri(2′,4′-dicarboxyphenyl)pyridine), which featured outstanding physicochemical properties, including honeycomb nanochannels, high porosity, large specific surface area, the coexistence of highly open Lewis acid-base sites, good thermal and chemical stability, and resistance to most organic solvents. Due to its extremely unsaturated metal tetra-coordinated Zn(ii) ions, hepta-coordinated Ho(iii) and high faveolate void volume (61.3%), the conversion rate of styrene oxide and CO2into cyclic carbonates in the presence of 2 mol% activatedNUC-30and 5 mol%n-Bu4NBr reached 99% under the mild conditions of 1.0 MPa and 60 °C. Furthermore, the luminescence sensing experiments proved thatNUC-30could be used as a fast, sensitive and highly efficiency sensor for the detection of Fe3+in aqueous solution. Therefore, these results prove that nanoporous MOFs assembled from pyridine-containing polycarboxylate ligands have wide applications, such as catalysis and as luminescent materials.
Interpenetrating Metal-Metalloporphyrin Framework for Selective CO2 Uptake and Chemical Transformation of CO2
Gao, Wen-Yang,Tsai, Chen-Yen,Wojtas, Lukasz,Thiounn, Timmy,Lin, Chu-Chieh,Ma, Shengqian
, p. 7291 - 7294 (2016)
Herein we report a robust primitive cubic (pcu)-topology metal-metalloporphyrin framework (MMPF), MMPF-18, which was constructed from a ubiquitous secondary building unit of a tetranuclear zinc cluster, Zn4(μ4-O)(-COO)6, and a linear organic linker of 5,15-bis(4-carboxyphenyl)porphyrin (H2bcpp). The strong π-π stacking from porphyrins and the lengthy H2bcpp ligand affords a 4-fold-interpenetrating network along with reduced void spaces and confined narrow channels. Thereby, MMPF-18 presents segmented pores and high-density metalloporphyrin centers for selective CO2 uptake over CH4 and size-selective chemical transformation of CO2 with epoxides forming cyclic carbonates under ambient conditions.
A robust indium-porphyrin framework for CO2 capture and chemical transformation
Xu, Lei,Zhai, Meng-Ke,Lu, Xin-Chao,Du, Hong-Bin
, p. 18730 - 18736 (2016)
An indium based metal-porphyrinic framework, denoted NUPF-3, was prepared based on a new amido-decorated porphyrin ligand. NUPF-3 possesses a rarely seen 4-fold interpenetrated pts framework with segmented pores and dense metalloporphyrin central sites. The structure can retain its crystallinity in commonly used solvents, as well as acidic/alkaline solutions with pH ranging from 1 to 12 for 48 h, exhibiting high chemical stability. Meanwhile, thermal analysis reveals that NUPF-3 possesses relatively high thermal stability. Owing to the presence of amido groups, structural interpenetration and a charged framework, NUPF-3 exhibits relatively high CO2 uptake. Moreover, NUPF-3 could be used as a good heterogeneous catalyst for cycloaddition of CO2 and epoxides, under relatively mild conditions, with good recyclability.
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Newman,Addor
, p. 1263 (1953)
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Efficient cycloaddition of epoxides and carbon dioxide over novel organic-inorganic hybrid zeolite catalysts
Li, Chen-Geng,Xu, Le,Wu, Peng,Wu, Haihong,He, Mingyuan
, p. 15764 - 15767 (2014)
Organic-inorganic hybrid zeolites with the MFI-type lamellar structure serve as efficient solid Lewis base catalysts for solvent-free synthesis of a variety of cyclic carbonates from corresponding epoxides and carbon dioxide. The ion-exchange with iodide, in particular, renders these materials an excellent catalytic activity and good recyclability.
One Robust Microporous TmIII-Organic Framework for Highly Catalytic Activity on Chemical CO2Fixation and Knoevenagel Condensation
Chen, Hongtai,Hu, Tuoping,Fan, Liming,Zhang, Xiutang
, p. 1028 - 1036 (2021/02/05)
In terms of documented references, multifunctional MOFs with high catalytic performance could be constructed from the combination of metal cations and polycarboxyl-pyridine ligands, which could efficiently endow crystallized porous frameworks with the coexisting Lewis acid-base properties. Thus, by employing a ligand-directed synthetic strategy, the exquisite combination of wave-like inorganic chains of [Tm(CO2)3(OH2)]n and mononuclear units of [Tm(CO2)4(OH2)2] with the aid of the specially designed ligand of 2,6-bis(2,4-dicarboxylphenyl)-4-(4-carboxylphenyl)pyridine (H5BDCP) generates one highly robust microporous framework of {(Me2NH2)[Tm3(BDCP)2)(H2O)3]·4DMF·H2O}n (simplified as NUC-25), which contains near-rectangular nanochannels and large solvent-residing voids. Furthermore, the activated state of NUC-25 with the removal of associated water molecules is a rarely reported bifunctional heterogeneous catalyst due to the coexistence of Lewis acid-base sites including 6-coordinated Tm3+ ions, uncoordinated carboxyl oxygen atoms, and Npyridine atoms. Just as expected, NUC-25 exhibits greatly high catalytic activity for the cycloaddition reaction of epoxides with CO2 into alkyl cyclic carbonates under bland solvent-free conditions, which should be ascribed to the polarity of nitrogen-containing pyridine heterocycles as Lewis base sites on the inner surface of nano-caged voids except for recognized Lewis acid sites of rare earth cations. Moreover, the excellent pore-size-dependent catalytic property for Knoevenagel condensation reactions confirms that NUC-25 can be viewed as a recyclable bifunctional heterogeneous catalyst. Therefore, these results strongly demonstrate that microporous MOFs assembled from pre-designed polycarboxyl-heterocyclic ligands display better catalytic performance not only for chemical CO2 fixation but also for Knoevenagel condensation reactions.