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433 results on '"Wu, Songgu"'

28. A Widespread Radical-Mediated Glycolysis Pathway.

Author

Ma, Kailiang, Xue, Bo, Chu, Ruoxing, Zheng, Yuchun, Sharma, Shishir, Jiang, Li, Hu, Min, Xie, Yiren, Hu, Yiling, Tao, Tiantian, Zhou, Yan, Liu, Dazhi, Li, Zhi, Yang, Qiaoyu, Chen, Yiwei, Wu, Songgu, Tong, Yang, Robinson, Robert C., Yew, Wen Shan, and Jin, Xinghua

Published
2024
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38. Biocompatible Nano-Cocrystal Engineering for Targeted Herbicide Delivery: Enhancing Efficacy through Stimuli-Responsive Release and Reduced Environmental Losses

Author

Xiao, Yuntian, Wu, Chuanhua, Liu, Yongkang, Zhou, Ling, Wu, Songgu, and Yin, Qiuxiang

Abstract

In addressing the critical challenges posed by the misuse and inefficiency of traditional pesticides, we introduce a Nano-Cocrystal material composed of the herbicide clopyralid and coformer phenazine. Developed through synergistic supramolecular self-assembly and mechanochemical nanotechnology, this Nano-Cocrystal significantly enhances pesticide performance. It exhibits a marked improvement in stability, with reductions in hygroscopicity and volatility by approximately 38%. Moreover, it intelligently modulates release according to environmental factors, such as temperature, pH, and soil inorganic salts, demonstrating decreased solubility by up to four times and improved wettability and adhesion on leaf surfaces. Importantly, the herbicidal activity surpasses that of pure clopyralid, increasing suppression rates of Medicago sativaL. and Oxalis corniculataL. by up to 27% at the highest dosage. This Nano-Cocrystal also shows enhanced crop safety and reduced genotoxicity compared to conventional formulations. Offering a blend of simplicity, cost-effectiveness, and robust stability, our findings contribute a sustainable solution to agricultural practices, favoring the safety of nontarget organisms.

Published
2024
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39. Distinct Mechanical Properties and Photomechanical Response from Isostructural, yet Chemically Different Molecular Crystal Actuators

Author

Lin, Jiawei, Zhou, Jianmin, Li, Liang, Tahir, Ibrahim, Wu, Songgu, Naumov, Panče, and Gong, Junbo

Abstract

Deciphering the effect of small changes in crystal packing and intermolecular interactions on the type and magnitude of mechanical motion is central to the manipulation of the macrodynamic behavior of dynamic crystals as smart materials. Here, we describe a peculiar example where both the mechanical flexibility and the photomechanical motion in molecular crystals can be altered by a single small chemical substitution. Specifically, we demonstrate that the mechanical flexibility of an organic crystal switches from plastic bending to elastic/plastic bending by changing a single functional group of a thiophene ring from methyl (crystal 1) to ethyl (crystal 2), but they have an almost identical crystal structure. The different molecular packing also determines the rate of the [2 + 2] photocycloaddition reaction, which further reflects on the type of photomechanical effect: while upon UV radiation, crystals 1undergo bending or coiling, depending on the crystal thickness, crystals 2do not display macroscopic photomechanical response. The bending of crystals 1can be repeated up to 30 times, and this deformation can be applied to move objects that are 103–104times the mass of the crystals with an output force density of 107–108N/m3and output work density of 102–103J/m3, surpassing a variety of traditional actuators.

Published
2024
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41. Synthesis, Characterization, and Analysis of Probenecid and Pyridine Compound Salts.

Author

Zhang, Menglong, Hou, Xinyu, Yu, Fuhai, Zhang, Liang, Hou, Baohong, Zhou, Lina, Xie, Chuang, Wu, Songgu, and Chen, Wei

Subjects
MELTING points, MOLECULAR conformation, ELECTRIC potential, INTERMOLECULAR interactions, SURFACE potential, DRUG solubility
Abstract

This study aimed to address the issue of the low solubility in the model drug probenecid (PRO) and its impact on bioavailability. Two salts of probenecid (PRO), 4-aminopyridine (4AMP), and 4-dimethylaminopyridine (4DAP) were synthesized and characterized by PXRD, DSC, TGA, FTIR, and SEM. The crystal structures of the two salts were determined by SCXRD, demonstrating that the two salts exhibited different hydrogen bond networks, stacking modes, and molecular conformations of PRO. The solubility of PRO and its salts in a phosphate-buffered solution (pH = 6.8) at 37 °C was determined, the results showed that the solubility of PRO salts increased to 142.83 and 7.75 times of the raw drug, respectively. Accelerated stability experiments (40 °C, 75% RH) showed that the salts had good phase stability over 8 weeks. Subsequently, Hirshfeld surface (HS), atom in molecules (AIM), and independent gradient model (IGM) were employed for the assessment of intermolecular interactions. The analyses of salt-forming sites and principles were conducted using molecular electrostatic potential surfaces (MEPs) and pKa rules. The lattice energy (EL) and hydration-free energy (EHF) of PRO and its salts were calculated, and the relationships between these parameters and melting points and the solubility changes were analyzed. [ABSTRACT FROM AUTHOR]

Published
2024
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42. Influence of the substituent in the benzene ring on the structure and properties of two isostructural crystals.

Author

Li, Zhonghua, Jia, Shengzhe, Wu, Songgu, and Gong, Junbo

Subjects
CRYSTALS, SINGLE crystals, PERMUTATION groups, BLUE light, CRYSTAL structure, SUBLIMATION (Chemistry)
Abstract

Isostructural crystals are crucial for the development of high-performance functional materials and precise control over physicochemical properties, whereas the design of isostructural crystals is extremely challenging. In this work single-component isostructural crystals were obtained with the substitution of side-chain groups. High-quality single crystals of isostructural crystals methyl 2-amino-5-methylbenzoate (MAMB) and methyl 2-amino-5-methoxybenzoate (MAMOB) were harvested through sublimation crystallization. Their crystal structures were determined by single-crystal X-ray diffraction (SCXRD). Similar intermolecular interactions and packing modes suggested that MAMB and MAMOB are 3D isostructural, and the quantitative similarity parameters were calculated via the XPac program. Furthermore, these two obtained isostructural crystals exhibited similar blue light emission behaviors and solvation effects. [ABSTRACT FROM AUTHOR]

Published
2024
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43. Modulation of luminescence properties of cocrystals composed of amino substituted dimethyl phthalates and 1,2,4,5-tetracyanobenzene by crystal engineering.

Author

Zhang, Xiaokai, Li, Zhonghua, Han, Rui, Lin, Jiawei, Li, Maolin, Zhou, Jianmin, Wu, Songgu, and Gong, Junbo

Subjects
LUMINESCENCE, FOURIER transform infrared spectroscopy, PHTHALATE esters, CHARGE transfer, FRONTIER orbitals, LUMINESCENCE measurement, FUSED silica
Abstract

The preparation of a cocrystal is one of the effective strategies to tune the luminescence properties of organic crystals. In this work, four charge transfer cocrystals were constructed with isomeric substances of amino substituted dimethyl phthalates as the donors and 1,2,4,5-tetracyanobenzene as the acceptor. The emission range of the individual electron donors is from 400 nm to 505 nm, while all cocrystals have their emission redshift exceeding 100 nm. The tunable emission range of the charge transfer cocrystals is from 573 nm to 640 nm. All the obtained four cocrystals contain π–π stacking structures with the presence of π–π and C–H⋯π interactions. Fourier transform infrared spectroscopy and UV-vis spectroscopy demonstrated the presence of charge transfer interactions in the cocrystals. The tuning of the luminescence properties of the cocrystals was explained by the analysis of the crystal packing structure and the intermolecular interaction, and the distribution of frontier orbitals was obtained by DFT calculation. We believe our work is helpful to understand the relationship between the crystal structure and luminescence properties in the charge transfer cocrystals and provide guidance for the modulation of the luminescence properties. [ABSTRACT FROM AUTHOR]

Published
2024
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