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565 results on '"Zhang, Xiang-Yu"'

48. Copper Oxygen Cluster-Based Metal–Organic Framework for Logical Fe3+and Cr3+Sensing and Chemical Fixation of CO2

Author

Shen, Simin, Zhang, Yuanhang, Liang, Lijuan, Zhang, Xiang-Yu, Huang, Kun, and Qin, Da-Bin

Abstract

Metal–organic frameworks (MOFs) exhibit attractive performance in fields such as luminescence sensors and catalysis. We here developed a new MOF ({Cu2(DPQ)2(OBPBI)}n), briefly named Cu-MOF, which has been facilely obtained through the self-assembly of 4, 4′-(quinoxaline-2, 3-diyl)dibenzoic acid (H2DPQ), 1, 1′-[oxybis(4, 1-phenylene)]bis(1H-imidazole) (OBPBI), and CuCl2·2H2O under solvothermal conditions. Cu-MOF contains a paddle-wheel and binuclear copper oxygen cluster unit and forms a 2, 2, 6-connected two-dimensional (2D) net with the point symbol of {42·88·125}{4}2{8}. Luminescence investigations indicate that Cu-MOF has a selective fluorescent response to Fe3+and Cr3+ions in water, with detection limits low to 10–8M, at least three times reusability, and a wide pH applicable scope. A combined logic gate INHIBIT has been built based on the different signal inputs of Fe3+and Cr3+ions and emission intensity signal outputs, providing great potential for distinguishing Fe3+and Cr3+ions. Moreover, Cu-MOF has been successfully applied for the catalytical conversion of CO2to cyclic carbonates under solvent-free and mild conditions (0.1 mol % Cu-MOF, 3 mol % TBAB, 1 atm of CO2, 15 h, 85 °C), with up to 98% yield, 99% selectivity, and three times reusability.

Published
2024
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49. Root Endophyte-Manipulated Alteration in Rhizodeposits Stimulates Claroideoglomusin the Rhizosphere to Enhance Drought Resistance in Peanut

Author

Wu, Xiao-Han, Ma, Chen-Yu, Jiang, Hui-Jun, Zhang, Xiang-Yu, Wang, Hao-Ming, Li, Hao-Ran, Zhao, Zi-Han, Sun, Kai, Zhang, Wei, and Dai, Chuan-Chao

Abstract

Drought dramatically affects plant growth and yield. A previous study indicated that endophytic fungus Phomopsis liquidambariscan improve the drought resistance of peanuts, which is related with the root arbuscular mycorrhizal fungi (AMF) community; however, how root endophytes mediate AMF assembly to affect plant drought resistance remains unclear. Here, we explored the mechanism by which endophytic fungus recruits AMF symbiotic partners via rhizodeposits to improve host drought resistance. The results showed that Ph. liquidambarisenhanced peanut drought resistance by enriching the AMF genus Claroideoglomusof the rhizosphere. Furthermore, metabolomic analysis indicated that Ph. liquidambarissignificantly promoted isoformononetin and salicylic acid (SA) synthesis in rhizodeposits, which were correlated with the increase in Claroideoglomusabundance following Ph. liquidambarisinoculation. Coinoculation experiments confirmed that isoformononetin and SA could enrich Claroideoglomus etunicatumin the rhizosphere, thereby improving the drought resistance. This study highlights the crucial role of fungal consortia in plant stress resistance.

Published
2024
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50. Cu(II)–Organic Framework for Carboxylative Cyclization of Propargylic Amines with CO2

Author

Zheng, Zhi-Wei, Zhou, Jun-Jie, Liu, Hua, Zhang, Xiang-Yu, Zhao, Jian, Zheng, Da-Sheng, Huang, Kun, and Qin, Da-Bin

Abstract

Effective CO2transformations hold essential significance for carbon neutrality and sustainable energy development. Carboxylative cyclization of propargylic amines with CO2serves as an atom-economic reaction to afford oxazolidinones, showing broad applications in organic synthesis and pharmaceutical fields. However, most catalysts involved noble metals, exhibited low efficiency, or required large amounts of base. Hence, it is imperative to explore alternative noble-metal-free catalysts in order to achieve efficient conversion while minimizing the use of additives. Herein, a novel nanopore-based Cu(II)–organic framework (1) based on a new imidazole carboxylic ligand was successfully constructed and exhibited excellent stability. Catalytic investigations revealed that the combination of 1with 1,4-diaza[2.2.2]bicyclooctane (DABCO) efficiently catalyzed the carboxylative cyclization of propargylic amines with CO2, achieving turnover numbers of 142 based on the catalyst and 7.1 based on DABCO. 1as a heterogeneous catalyst maintained high catalytic performance even after being reused at least 5 cycles, with its structure remaining stable. The strong activation of Cu(II) cluster nodes of catalyst 1toward −NH– groups within organic substrates, as demonstrated by mechanism experiments, along with excellent CO2adsorption performance and the presence of regular 1D channels, synergistically facilitates the reaction rate. This research presents the first instance of a Cu(II)–organic framework achieving this cyclization reaction, offering wide prospects for novel catalyst design and CO2utilization.

Published
2024
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