IMAGING SCIENCE AND PHOTOCHEMISTRY

2019, 37(2): 0-0.

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Synthesis of Aryl-substituted Pyrrole Derivatives with Tunable Emissive Behaviors

GAO Yu, LIU Guogang, SHI Jianbing, DONG Yuping

2019, 37(2): 93-106. DOI: 10.7517/issn.1674-0475.190101

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A new class of pyrrole derivatives containing methyl benzoate groups, MB3PE2 and MB3, were synthesized using the Sonogashira coupling reaction, and were used to develop typical donor (D, pyrrole)-acceptor (A, -PhCOOCH₃) fluorophores that exhibited tunable fluorescent properties. Moreover, their emission properties and fluorescence dynamics were systematically investigated to elucidate their structure-property relationships. The results revealed that the π-conjugation and/or D-A geometry of these compounds has a significant effect on their emissive behaviors. MB3PE2 has π-T-shaped D-A structure while MB3 has T-shaped D-A structure. Both of them emit blue light with apparent solvatochromic effects but had different quantum yields in different states such as solution and aggregates states, which are more 2.6 times quantum yield of π-T-shaped D-A MB3PE2 than that of T-shaped MB3.The result provides a guidance for designing new D-A dyes with high quantum yield in solution.

Niobium Nitride Catalyst for Electrocatalytic Reduction of CO₂

LI Wenting, HOU Pengfei, KANG Peng

2019, 37(2): 107-117. DOI: 10.7517/issn.1674-0475.181208

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Converting CO₂ to CO by electrochemical method is considered as an economic and friendly strategy to solve problems of resource and environment. In this work, precursor of niobium/carbon was prepared by wet chemical method and converted into Nb₄N₅/C and Nb₂O₅/C after calcination under NH₃ and Ar respectively. When the nitriding temperature reaches to 700℃, prepared Nb₄N₅/C exhibits excellent catalytic activity with CO Faradaic efficiency of 57% at -0.83 V vs RHE in CO₂ saturated 0.5 mol·L^-1 NaCl solution. The results show that the catalytic activity of Nb₄N₅/C is related to the N doping in Nb₄N₅.

Synthesis and Properties of a Novel Ultraviolet Absorber 1, 4-Diaryl-1, 3-butadiyne

WANG Chen, ZHAO Ziren, SHI Heping, TIAN Wenjuan, ZHANG Bianxiang

2019, 37(2): 118-126. DOI: 10.7517/issn.1674-0475.181206

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In this paper, aryl sulfide containing terminal alkyne was used as raw material, (diacetoxyiodo)benzene was used as oxidant, cuprous chloride was used as catalyst, and 1,4-bis(2-arylthiophenyl)-1,3-butadiyne was synthesized by reaction at room temperature for 30 minutes. The 1,3-butadiyne compound was characterized by ¹HNMR, ¹³CNMR, etc., and its optical properties and application as an ultraviolet absorber in UV-curable coatings were investigated. The results show that the compound can effectively absorb ultraviolet light from 270 nm to 360 nm and has strong absorption intensity and low degree of UV degradation. It has good compatibility with resin, monomer and no odor. At the same time, it does not participate in the curing of free radical systems, which enhances the light stability of coatings and cured coatings, and is beneficial to the storage of UV-curable coatings. It is a kind of ultraviolet light absorber with promising prospects.

New Modified Attapulgite for Arsenic Ions Adsorption by Atomic Fluorescence Spectrometry

LI Xiaoning, LI Meng

2019, 37(2): 127-135. DOI: 10.7517/issn.1674-0475.181207

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Arsenic ion pollution has drawn great attention due to its severe destruction of water resources. In this work, attapulgite clay materials and its feasibility for the adsorption of arsenic ions have been investigated. The pH, contact time and initial concentration of arsenic ions were investigated by atomic fluorescence spectrometry on the iron oxide loaded attapulgite clay (Fe₂O₃/ATP). The prepared adsorbent was characterized by SEM, EDX and SEM-EDX mapping. At the same time, the adsorption kinetics and adsorption isotherm model of the prepared adsorbent are analyzed. The results show that the modified attapulgite has a significant increase in the adsorption of arsenic ions, and the adsorption efficiency can reach 98% at a lower concentration. The adsorption conforms to the Langmuir isotherm adsorption model and the pseudo-second-order kinetic equation.

Construction of Two-photon Excited Supramolecular Polymer Nanoparticles and Their Bioimaging Application

LIU Xiaoqin, HUANG Yuanyuan, GAO Jianfeng, CHEN Yuzhe, TONG Zhenhe(TUNG Chen-ho), WU Lizhu

2019, 37(2): 136-145. DOI: 10.7517/issn.1674-0475.190104

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A difluoroboron β-diketonate derivative(BF₂-bisUPy)and a porphyrin derivative (Por(Pt)-bisUPy)bearing bis-2-ureido-4[1H]-pyrimidinone (bisUPy)were assembled into a supramolecular polymer by quadruple hydrogen bonding, which afforded uniformly water-dispersed supramolecular polymer nanoparticles by microemulsion method. Scanning electron microscopy shows that the obtained nanoparticles have a particle size of about 60 nm. Ultraviolet-visible absorption spectroscopy, fluorescence emission spectroscopy and lifetime decay experiments have demonstrated the occurrence of efficient energy transfer between BF₂-bisUPy and Por(Pt)-bisUPy. BF₂-bisUPy has excellent two-photon absorption performance, which can be used as an energy donor to enhance the luminescence properties of Por(Pt)-bisUPy under two-photon excitation by fluorescence resonance energy transfer(FRET). The prepared supramolecular polymer nanoparticles have strong fluorescence and phosphorescence dual-emission under two-photon excitation. The nanomaterials can enter cells and exhibit excellent biocompatibility. It also exhibits bright bioimaging with dual-emission under two-photon excitation.

Gradient-preserving Color Transfer Algorithm Based on Multi-channel Adaptive Matching

YU Yiming, WANG Qi, ZHANG Qi, CHEN Xi, WANG Xiaoju

2019, 37(2): 146-155. DOI: 10.7517/issn.1674-0475.181205

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In this paper, a gradient-preserving color transfer algorithm based on multi-channel adaptive matching is proposed to improve the classical Welsh algorithm and Reinhard algorithm. L, a and b channels are introduced as matching criteria, the processing of a single channel will not affect the other two channels because of the sequence irrelevance between channels, eliminating the drawbacks of single target region in RGB color mode that is vulnerable to multi-channel influence. For images with similar gray values, the channel with the largest difference in the mean chromaticity between the processing area and the background area is adaptively matched with the corresponding channel of the reference image, which solves the problem that Welsh algorithm can easily misjudge the grading of color source images with small gray differences or overlapping gray ranges. Then, gradient factor is introduced and weighted with the standard deviation ratio of reference image to source image. The result is taken as the scaling ratio coefficient of the improved transfer algorithm in this paper. Gradient-preserving color transfer algorithm is used to color each group of matched pixels to avoid the problems of loss of color detail information and unnatural transition between tones in Reinhard algorithm. Experiments show that the color effect of the improved algorithm is better than that of the classical Welsh algorithm and Reinhard algorithm, which greatly improves the flexibility and applicability of the color transfer algorithm.

Current Status and Prospects of Magnetic Resonance/Optical Bimodal Molecular Probes

JIANG Wei, FANG Huiying, HE Xiaojing

2019, 37(2): 156-162. DOI: 10.7517/issn.1674-0475.181202

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The dual-modality imaging technology based on magnetic resonance and fluorescence imaging not only overcomes the inherent defects of traditional single-molecular imaging technology in terms of sensitivity, specificity and resolution, but also broadens the research scope and application prospects of molecular imaging technology in the fields of diagnosis and treatment monitoring. In this paper, the application and research progress of magnetic resonance/fluorescence bimodal molecular probes are reviewed.

Efficacy and Feasibility Analysis of Ultrasound-guided Paravertebral Nerve Block for the Treatment of Post-herpetic Neuralgia

ZHANG Yanru, FENG Weizheng, SHAO Huiying, LIU Shoufang, DUAN Changling, ZHAO Jiamin

2019, 37(2): 163-168. DOI: 10.7517/issn.1674-0475.181001

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To analysis the efficacy and feasibility of ultrasound-guided paravertebral nerve block for the treatment of post-herpetic neuralgia, ninety-four patients with PHN admitted to our hospital from December 2015 to December 2017 were selected as the study subjects. They were randomly divided into two groups according to the order of treatment. The control group received routine treatment with pregabalin, and the observation group combined routine treatment with ultrasound-guided paravertebral nerve block therapy for 4 weeks. Pittsburgh sleep quality index (PSQI) scores and pain visual analogue (VAS) scores before treatment, 1 week, 2 weeks, and 4 weeks of treatment were compared. The combined efficacy after treatment was evaluated, and the adverse reactions during treatment were recorded. The results showed that compared with pre-treatment, the VAS scores of the two groups were gradually decreased at 1 week, 2 weeks, and 4 weeks of treatment, and the observation group was significantly lower than the control group at each time point after treatment, the difference was statistically significant (P<0.05). The PSQI scores of the two groups were gradually decreased at 1 week, 2 weeks, and 4 weeks of treatment, and the observation group was significantly lower than the control group at each time point after treatment, the difference was statistically significant (P<0.05). The total effective rate was 89.36% in the observation group and 78.72% in the control group, and the difference was statistically significant (P<0.05). There was no significant difference in the incidence of adverse reactions between the two groups (P>0.05). Ultrasound-guided paravertebral nerve block for PHN can significantly reduce neuropathic pain in patients, improve sleep quality, and has security guarantee.

2019, 37(2): 169-169.

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