Investigation of UV-vis spectra of azobenzene containing carboxyl groups

Zhao, Jianqiang; Zhang, Yue; Yan, Xin; Gan, Lihua; Wang, Guan-Lei

doi:10.1007/s00894-021-04702-7

Cited by 2 publications

(3 citation statements)

References 21 publications

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“…Despite the increasing chain length of monomers 2 , 3 , and 4 , it is noteworthy that, even though the carbonyl group in these monomers is positioned relatively far from the benzene ring, this extended carbon chain length does not exert a significant influence on the maximum absorption wavelength corresponding to the π–π* electron transition of the trans isomers. This observation aligns with findings reported in the literature by Zhao et al − Similarly, the characteristic peak variation trend of the n –π* transition is the same as the π–π* electron transition.…”

Section: Resultssupporting

confidence: 92%

Synthesis and Characteristics of Smart Coating Materials for Reversible Double Stimulus-Responsive Oil–Water Separation

Zhang,

Wang,

Qiu

et al. 2024

ACS Appl. Polym. Mater.

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The developed smart coating for water−oil separation, characterized by its mild separation conditions, ease of control, and absence of secondary pollution, holds promising potential for applications in controlled liquid transmission, oil−water separation, smart textiles, and biosensing films. This work focused on synthesizing copolymers that respond to both photon and pH stimuli. Initially, 4-trifluoromethoxy-4′-methacryloxyazobenzene (FMAB) and similar monomers, serving as photon-responsive units with varying carbon chain lengths, were synthesized using different synthetic routes. Such a design approach also aimed to enhance the hydrophobic characteristics of the photoresponsive segments to a certain degree. Theoretically, the impact of the carbonyl position on nucleophilic substitution reactions was investigated through density functional theory (DFT) calculations. These monomers were subsequently copolymerized individually with dimethylaminoethyl methacrylate (DMAEMA), which acts as a pH-responsive unit, using the reversible addition−fragmentation chain transfer (RAFT) technique in a one-step copolymerization process. The polymers were subsequently coated onto glass slides to form films, the contact angles of which could be modulated in response to both light and pH stimuli. To be highlighted, the maximum contact angle change can reach 131°under double stimulation. To ultimately showcase its oil−water separation capabilities, the polymer was combined with a nonwoven fabric to create a membrane. This membrane is capable of reversibly transitioning between hydrophilic−lipophobic and hydrophobic− lipophilic states, demonstrating substantial potential for future advancements in efficient water−oil separation.

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Section: Resultssupporting

confidence: 92%

Synthesis and Characteristics of Smart Coating Materials for Reversible Double Stimulus-Responsive Oil–Water Separation

Zhang,

Wang,

Qiu

et al. 2024

ACS Appl. Polym. Mater.

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“…However, since ESI‐FT‐ICR‐MS only provided the mass‐to‐charge ratio of molecular clusters derived from isobarically resolved ions, the molecules obtained from Reaxys might not reflect the real chemical composition in the atmosphere. Functional groups, as the composed unit of molecular absorption (Higashiguchi et al., 2005; Zhao et al., 2021), could be used to reflect the composition of light‐absorbing chromophores. In this research, 18 functional groups that have been reported in previous atmospheric studies, such as C‐N bound (mainly from vehicles) and ‐CO‐NH‐ (primarily from biomass burnings, Table S5 in Supporting Information ) were considered in the RF Mol model (Table S5 in Supporting Information ) (Cheng et al., 2006).…”

Section: Resultsmentioning

confidence: 99%

“…In this research, 18 functional groups that have been reported in previous atmospheric studies, such as C‐N bound (mainly from vehicles) and ‐CO‐NH‐ (primarily from biomass burnings, Table S5 in Supporting Information ) were considered in the RF Mol model (Table S5 in Supporting Information ) (Cheng et al., 2006). Except for the kind and position of the functional group (Higashiguchi et al., 2005; Zhao et al., 2021), some previous research reported that the molecular absorption spectra could also be affected by the properties and pH value of solutions (Phillips et al., 2017), the water‐soluble metallic ions (e.g., Fe(III)) (Li et al., 2022), as well as the interaction of chromophores inside the mixture components in solution (Boyle et al., 2009; Yakimov et al., 2022).…”

Section: Resultsmentioning

confidence: 99%

Nitrogen‐Containing Functional Groups Dominate the Molecular Absorption of Water‐Soluble Humic‐Like Substances in Air From Nanjing, China Revealed by the Machine Learning Combined FT‐ICR‐MS Technique

Hong,

Zhang,

Bao

et al. 2023

JGR Atmospheres

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The light absorption capacity of water‐soluble humic‐like substances (HULISWS) at the molecular level is crucial for reducing the uncertainties in modeling the radiative forcing. This study proposed a machine learning approach to allocate the light absorption coefficient at 365 nm (Abs365) of HULISWS into 8084 Fourier transform‐ion cyclotron resonance mass spectrometry (FT‐ICR‐MS) detached molecular markers and their potential functional groups. The ML model showed an acceptable uncertainty (<5%) to the whole Abs365 value based on the prediction errors. The results showed that five critical light‐absorbing molecules (C4H6O4NS, C8H6O4NS, C11H15O3N2, C12H15O3N2, and C19H21O6) could explain 74% (±3%) of the variation of Abs365 in the winter, whereas no crucial light‐absorbing molecules were found in the summer. Besides, the nitrogen‐containing functional groups were found to dominate (61% ± 8%) the molecular absorption near the 365 nm of the spectrum. This work illustrated how functional groups affect the absorption of HULISWS, providing critical information for future research of HULISWS on the molecular level.

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Investigation of UV-vis spectra of azobenzene containing carboxyl groups

Cited by 2 publications

References 21 publications

Synthesis and Characteristics of Smart Coating Materials for Reversible Double Stimulus-Responsive Oil–Water Separation

Synthesis and Characteristics of Smart Coating Materials for Reversible Double Stimulus-Responsive Oil–Water Separation

Nitrogen‐Containing Functional Groups Dominate the Molecular Absorption of Water‐Soluble Humic‐Like Substances in Air From Nanjing, China Revealed by the Machine Learning Combined FT‐ICR‐MS Technique

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