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11 results on '"Songna Zhang"'

1. The sharp structural switch of covalent cages mediated by subtle variation of directing groups

Author

Qiong Chen, Zhaoyong Li, Ye Lei, Yixin Chen, Hua Tang, Guangcheng Wu, Bin Sun, Yuxi Wei, Tianyu Jiao, Songna Zhang, Feihe Huang, Linjun Wang, and Hao Li

Subjects
Science
Abstract

Abstract It is considered a more formidable task to precisely control the self-assembled products containing purely covalent components, due to a lack of intrinsic templates such as transition metals to suppress entropy loss during self-assembly. Here, we attempt to tackle this challenge by using directing groups. That is, the self-assembly products of condensing a 1:2 mixture of a tetraformyl and a biamine can be precisely controlled by slightly changing the substituent groups in the aldehyde precursor. This is because different directing groups provide hydrogen bonds with different modes to the adjacent imine units, so that the building blocks are endowed with totally different conformations. Each conformation favors the formation of a specific product that is thus produced selectively, including chiral and achiral cages. These results of using a specific directing group to favor a target product pave the way for accomplishing atom economy in synthesizing purely covalent molecules without relying on toxic transition metal templates.

Published
2023
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2. Electron paramagnetic resonance studies of the chelate-based ionic liquid in different solvents

Author

Songna Zhang, Xinyu Wang, Jia Yao, and Haoran Li

Subjects
Chelate-based ionic liquid, Probe, Electron paramagnetic resonance spectra, Solvents, Renewable energy sources, TJ807-830, Ecology, QH540-549.5
Abstract

The electron paramagnetic resonance spectra of the chelate-based ionic liquid [C10mim][Cu(F6-acac)3] in different solvents have been obtained at 120 K. It was found that the values of the 63Cu hyperfine coupling constants (AIL) of [C10mim][Cu(F6-acac)3] in molecular solvents were from 116 to 180 Gauss. Moreover, the AIL values in general ionic liquids are more complicated, and two sets of peaks can often be observed in their electron paramagnetic resonance spectra. Based on the Kamlet–Taft parameters, relative permittivity, the experimental results were discussed in terms of solvation effect and coordination of the solvents.

Published
2020
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4. Structure and physicochemical properties of chelate-based ionic liquids

Author

Jia Yao, Songna Zhang, Haoran Li, and Sijie Song

Subjects
chemistry.chemical_compound, Chemistry, General Chemical Engineering, fungi, Inorganic chemistry, Ionic liquid, Materials Chemistry, food and beverages, Chelation, General Chemistry, Microstructure, Biochemistry, Quantum chemistry
Abstract

Chelate-based ionic liquids (ChILs) are a type of chelating compound which can melt at low temperature (

Published
2021

5. Special Mixing Behavior of Chelate‐based Ionic Liquid with Methanol

Author

Jia Yao, Haoran Li, Yongtao Wang, and Songna Zhang

Subjects
chemistry.chemical_compound, Chemistry, Two-dimensional correlation analysis, Small-angle X-ray scattering, Ionic liquid, Correlation analysis, Mixing (process engineering), Physical chemistry, Chelation, Methanol, Physical and Theoretical Chemistry, Atomic and Molecular Physics, and Optics, Ion
Abstract

Compared to the general ionic liquids (ILs), a significant deviation of the binary mixtures of 1-decyl-3-methylimidazolium tri(hexafluoroacetylaceto)-copper(II) ([C10 mim][Cu(hfacac)3 ]) with methanol was found, indicating the way methanol interacts with ILs might be governed by the special structure of the chelating anion. IR results showed that the v (C2-H) of 1-decyl-3-methylimidazolium hexafluoroacetylacetonate ([C10 mim][hfacac]) blue-shifted more significantly than that of [C10 mim][Cu(hfacac)3 ], meanwhile the v (C=O) red-shifted in [C10 mim][Cu(hfacac)3 ], which is contrast with that in [C10 mim][hfacac]. Two-dimensional correlation analysis of the FTIR spectra indicated that the chelating cavity has little effect on the sequence of the ILs sites that interact with methanol. Combined with small angle X-ray scattering (SAXS) results, the picture of mixing processes in these two systems were proposed. Methanol interacts directly with the anion followed by the cation in [C10 mim][hfacac], while methanol preferentially enters the chelating cavity and enhances the packing effect in the [C10 mim][Cu(hfacac)3 ] system.

Published
2021

7. Electron paramagnetic resonance studies of the chelate-based ionic liquid in different solvents

Author

Jia Yao, Xinyu Wang, Haoran Li, and Songna Zhang

Subjects
Electron paramagnetic resonance spectra, Materials science, lcsh:TJ807-830, lcsh:Renewable energy sources, Relative permittivity, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Spectral line, law.invention, chemistry.chemical_compound, Hyperfine coupling, law, lcsh:QH540-549.5, Chelation, Electron paramagnetic resonance, Renewable Energy, Sustainability and the Environment, Solvation, Chelate-based ionic liquid, 021001 nanoscience & nanotechnology, Probe, 0104 chemical sciences, chemistry, Ionic liquid, Solvents, Physical chemistry, lcsh:Ecology, 0210 nano-technology
Abstract

The electron paramagnetic resonance spectra of the chelate-based ionic liquid [C10mim][Cu(F6-acac)3] in different solvents have been obtained at 120 K. It was found that the values of the 63Cu hyperfine coupling constants (AIL) of [C10mim][Cu(F6-acac)3] in molecular solvents were from 116 to 180 Gauss. Moreover, the AIL values in general ionic liquids are more complicated, and two sets of peaks can often be observed in their electron paramagnetic resonance spectra. Based on the Kamlet-Taft parameters, relative permittivity, the experimental results were discussed in terms of solvation effect and coordination of the solvents.

Published
2020

8. Physicochemical Properties of the Binary Mixtures of CuII-Containing Chelate-Based Ionic Liquids with Linear Alcohols

Author

Songna Zhang, Jia Yao, Xinyu Wang, Haoran Li, and Yongtao Wang

Subjects
Materials science, Scattering, Small-angle X-ray scattering, Astrophysics::High Energy Astrophysical Phenomena, General Chemical Engineering, Binary number, 02 engineering and technology, General Chemistry, 021001 nanoscience & nanotechnology, Industrial and Manufacturing Engineering, chemistry.chemical_compound, 020401 chemical engineering, chemistry, Ionic liquid, Physical chemistry, Chelation, 0204 chemical engineering, 0210 nano-technology
Abstract

Systematic measurements (densities, viscosities, conductivities) combined with small-angle X-ray scattering (SAXS) experiments were performed for binary mixtures of CuII-containing chelate-based io...

Published
2019

9. The Polarity of Ionic Liquids: Relationship between Relative Permittivity and Spectroscopic Parameters of Probe

Author

Jia Yao, Songna Zhang, Haoran Li, and Xinyu Wang

Subjects
Materials science, Polarity (physics), General Chemical Engineering, Relative permittivity, 02 engineering and technology, General Chemistry, 021001 nanoscience & nanotechnology, Industrial and Manufacturing Engineering, Solvent, chemistry.chemical_compound, 020401 chemical engineering, chemistry, Chemical physics, Ionic liquid, 0204 chemical engineering, 0210 nano-technology
Abstract

Polarity is one of the most important properties of ionic liquids (ILs) and an essential requirement when choosing an IL for a specific industrial application. Up to now, several empirical solvent ...

Published
2019

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