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220 results on '"Lin, Qipu"'

27. Crystalline microporous small molecule semiconductors based on porphyrin for high-performance chemiresistive gas sensing.

Author

Deng, Wei-Hua, He, Liang, Chen, Er-Xia, Wang, Guan-E., Ye, Xiao-Liang, Fu, Zhi-Hua, Lin, Qipu, and Xu, Gang

Abstract

Organic small molecule semiconductor (OSMS) microporous crystals with strong π–π interactions are rare but have great potential in applications requiring both excellent mass and charge transport. To obtain such a microporous structure, effective molecule design and control over the packing of the OSMS are necessary but still challenging. Herein, we report three meso-tetrakis (4-carboxyphenyl) porphyrin (TCPP) based porous OSMS materials, 1, 2 and 3, whose porosity and π–π interactions among TCPPs were modulated by varying the H-bonding linkage nodes. The relationship among the hydrogen bonding structure, packing mode and sensing performances has been carefully studied. With the largest overlap between porphyrin rings and strongest face-to-face π–π interactions in the prepared compound, 1 showed the best performances. Moreover, it also represents the first RT NO2 chemiresistive sensing material that simultaneously achieved an experimental limit of detection as low as 20 ppb and a time of recovery as short as 0.6 min. This work revealed the key role of H-bonding linkage node in constructing a microporous OSMS and provides a new type of high-performance rt chemiresistive gas sensing material. [ABSTRACT FROM AUTHOR]

Published
2022
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34. Energy Band Alignment and Redox‐Active Sites in Metalloporphyrin‐Spaced Metal‐Catechol Frameworks for Enhanced CO2 Photoreduction.

Author

Chen, Er‐Xia, Qiu, Mei, Zhang, Yong‐Fan, He, Liang, Sun, Ya‐Yong, Zheng, Hui‐Li, Wu, Xin, Zhang, Jian, and Lin, Qipu

Subjects
ENERGY bands, ARTIFICIAL photosynthesis, PHOTOREDUCTION, PHOTOCATALYSTS, HYDROXYL group, METALLOPORPHYRINS, FORMIC acid
Abstract

Two new chemically stable metalloporphyrin‐bridged metal‐catechol frameworks, InTCP‐Co and FeTCP‐Co, were constructed to achieve artificial photosynthesis without additional sacrificial agents and photosensitizers. The CO2 photoreduction rate over FeTCP‐Co considerably exceeds that obtained over InTCP‐Co, and the incorporation of uncoordinated hydroxyl groups, associated with catechol, into the network further promotes the photocatalytic activity. The iron‐oxo coordination chain assists energy band alignment and provides a redox‐active site, and the uncoordinated hydroxyl group contributes to the visible‐light absorptance, charge‐carrier transfer, and CO2‐scaffold affinity. With a formic acid selectivity of 97.8 %, FeTCP‐OH‐Co affords CO2 photoconversion with a reaction rate 4.3 and 15.7 times higher than those of FeTCP‐ Co and InTCP‐Co, respectively. These findings are also consistent with the spectroscopic study and DFT calculation. [ABSTRACT FROM AUTHOR]

Published
2022
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40. Photochemical In Situ Exfoliation of Metal–Organic Frameworks for Enhanced Visible‐Light‐Driven CO2 Reduction.

Author

Zheng, Hui‐Li, Huang, Shan‐Lin, Luo, Ming‐Bu, Wei, Qin, Chen, Er‐Xia, He, Liang, and Lin, Qipu

Subjects
METAL-organic frameworks, PHOTOCATALYSTS, COEVOLUTION, CATALYTIC activity, CARBON dioxide, CATALYSIS
Abstract

Two novel two‐dimensional metal–organic frameworks (2D MOFs), 2D‐M2TCPE (M=Co or Ni, TCPE=1,1,2,2‐tetra(4‐carboxylphenyl)ethylene), which are composed of staggered (4,4)‐grid layers based on paddlewheel‐shaped dimers, serve as heterogeneous photocatalysts for efficient reduction of CO2 to CO. During the visible‐light‐driven catalysis, these structures undergo in situ exfoliation to form nanosheets, which exhibit excellent stability and improved catalytic activity. The exfoliated 2D‐M2TCPE nanosheets display a high CO evolution rate of 4174 μmol g−1 h−1 and high selectivity of 97.3 % for M=Co and Ni, and thus are superior to most reported MOFs. The performance differences and photocatalytic mechanisms have been studied with theoretical calculations and photoelectric experiments. This study provides new insight for the controllable synthesis of effective crystalline photocatalysts based on structural and morphological coregulation. [ABSTRACT FROM AUTHOR]

Published
2020
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48. A wide pH-range stable crystalline framework based on the largest tin-oxysulfide cluster [Sn20O10S34].

Author

Huang, Shan-Lin, He, Liang, Chen, Er-Xia, Lai, Heng-Dong, Zhang, Jian, and Lin, Qipu

Subjects
COMPLEX ions, TIN, AQUEOUS solutions, FLUORESCENCE
Abstract

We report, herein, a diamond-like oxysulfide framework, 3D-T4-SnOS, based on the largest supertetrahedral cluster of Sn4+ ions, i.e. [Sn20O10S34]. The framework remains intact in aqueous solution over a pH range between 1 and 14, and has a narrower optical bandgap, red-shifted fluorescence emission, and an enhanced photoelectric response compared to that of the smaller version, 2D-T3-SnOS, which has a building unit of supertetrahedral [Sn10O4S20]. [ABSTRACT FROM AUTHOR]

Published
2019
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49. Robust multivariate metal–porphyrin frameworks for efficient ambient fixation of CO2 to cyclic carbonates.

Author

He, Liang, Nath, Jayanta Kumar, and Lin, Qipu

Subjects
METAL-organic frameworks, METALLOPORPHYRINS
Abstract

A family of multivariate metal–organic frameworks (MOFs) with three-kinds of orderly distributed metals were designed and successfully synthesized by combining metalloporphyrin sheets and pentafluoride (NbOF5)2− pillars. Benefiting from the cooperative nature of open-metal-sites (OMSs) within porphyrins, specific pore-sizes, coupled with fluorine-rich electrostatic environments, the fabricated materials demonstrated high affinity toward CO2, and good catalytic performance, structural robustness, and good recyclability for the conversion of epoxides and CO2 to cyclic carbonates at room temperature and 1 atm pressure. [ABSTRACT FROM AUTHOR]

Published
2019
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