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Composite cathode material based on sulfur and microporous carbon for Li–S batteries 基于硫和微孔碳的锂-S 电池复合阴极材料
IF 1.8 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.003
Svetlana A. Novikova , Daria Yu. Voropaeva , Sergey A. Li , Tatiana L. Kulova , Alexander M. Skundin , Irina A. Stenina , Andrey B. Yaroslavtsev

In this work, a new cathode material for lithium–sulfur (Li–S) batteries was developed. Microporous carbon (with predominant pore size £1.2 nm) served as both a matrix for sulfur retention and conductive additive. Microporous carbon was shown to be capable of adsorbing lithium polysulfides thereby suppressing their migration toward lithium anode. The discharge capacity of the S/C composite at the 1st and 20th cycles in Li–S battery operation was 513 and 421 mAh g–1 at a scan rate of 0.1 mV s–1.

在这项工作中,开发了一种用于锂硫(Li-S)电池的新型阴极材料。微孔碳(主要孔径为 1.2 nm 英镑)既是硫的保留基质,又是导电添加剂。研究表明,微孔碳能够吸附多硫化锂,从而抑制其向锂阳极迁移。在 0.1 mV s-1 的扫描速率下,S/C 复合材料在锂-S 电池运行的第 1 次和第 20 次循环中的放电容量分别为 513 mAh g-1 和 421 mAh g-1。
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引用次数: 0
Spectroscopic analysis of Tb3+ activated Ca3Al2O6 phosphor for display applications 用于显示应用的 Tb3+ 活化 Ca3Al2O6 荧光粉的光谱分析
IF 1.8 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.042
K. Koteswara Rao , M.C. Rao , Vikas Dubey , K.V.R. Murthy

The experimental results of luminescence measurements in Ca3Al2O6 : Tb showed single excitation wavelengths at 246 and 278 nm in the UV region. For the 278 nm excitation, six distinct emission peaks were found at 378, 419, 437, 447, 487 and 544 nm. Some spectroscopic parameters were calculated using CIE coordinates showing emission in the near-blue region, which may be useful for various display devices.

Ca3Al2O6 : Tb 的发光测量实验结果显示,紫外区的单一激发波长为 246 和 278 纳米。在 278 nm 的激发波长下,在 378、419、437、447、487 和 544 nm 处出现了六个不同的发射峰。利用 CIE 坐标计算出的一些光谱参数显示,该物质在近蓝区域发射,这可能对各种显示设备有用。
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引用次数: 0
Is dual emission of copper subgroup d10-metal complexes a necessary and sufficient condition for ratiometric luminescence thermometry? 铜亚族 d10 金属复合物的双发射是比率发光测温法的必要和充分条件吗?
IF 1.8 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.001
Igor D. Strelnik , Ilya E. Kolesnikov , Alexey A. Kalinichev , Tatiana P. Gerasimova , Kamil D. Akhmadgaleev , Irina R. Dayanova , Andrey A. Karasik

Transition metal complexes of copper subgroup metals are actively studied objects for temperature sensors. Their luminescence arising from the 3ILCT, 3MLCT or 3CC excited states is characterized by emission in all ranges of visible spectra and high quantum yields. Due to the ability of the complexes to emit in a dual band mode, these complexes are attractive for the temperature sensing in the ratiometric mode. Dual emission of complexes is usually susceptible of the irregular changes in intensity of two emission bands during the temperature changes. This is an important and necessary property for the utilization of phosphors as ratiometric thermometers. The structures and emission properties of gold(i) and copper(i) complexes are considered with the aim to demonstrate the possibility to apply such complexes as ratiometric molecular luminescent thermometers for the remote control of the object’s temperature.

铜亚族金属的过渡金属络合物是温度传感器的热门研究对象。它们由 3ILCT、3MLCT 或 3CC 激发态产生的发光具有在所有可见光谱范围内发射和量子产率高的特点。由于这些络合物能够以双波段模式发射,因此对于以比率模式进行温度传感非常有吸引力。复合物的双发射通常会在温度变化时出现两个发射带强度的不规则变化。这是荧光粉用作比率温度计的一个重要和必要的特性。本文研究了金(i)和铜(i)络合物的结构和发射特性,旨在证明将此类络合物用作远程控制物体温度的比率分子发光温度计的可能性。
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引用次数: 0
Inhibiting the cancer cell growth by maleopimarate amino imide bis-tetrazoles synthesized via the azido-Ugi reaction 通过叠氮-乌基反应合成的马来酰亚胺氨基亚胺双四唑抑制癌细胞生长
IF 1.8 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.012
Anna A. Smirnova, Elena V. Tretyakova, Oxana B. Kazakova

The azido-Ugi reaction of methyl maleopimarate N-(2- aminoethyl) imide with isocyanides, paraformaldehyde and trimethylsilyl azide in one step leads to 1,5-disubstituted diterpene bis-tetrazoles. The compounds demonstrate selective cytotoxicity against NCI-60 cancer cell panel.

马来酰亚胺酸甲酯 N-(2-氨基乙基)亚胺与异氰酸酯、多聚甲醛和三甲基硅叠氮化物的叠氮-Ugi 反应一步生成了 1,5 二甲基二萜双四唑。这些化合物对 NCI-60 癌细胞具有选择性细胞毒性。
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引用次数: 0
The Huisgen’s cycloaddition of BODIPY acetylene and ferrocene azides in supercritical CO2 BODIPY 乙炔和二茂铁叠氮化物在超临界二氧化碳中的 Huisgen 环加成反应
IF 1.8 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.027
Kirill G. Pavlov , Dmitry A. Guk , Roman O. Burlutsky , Anna A. Moiseeva , Olga O. Krasnovskaya , Dmitry A. Lemenovskiy , Nikolay V. Zyk , Elena K. Beloglazkina

The copper-catalyzed azide–alkyne cycloaddition of BODIPY acetylene derivative and ferrocene azides in supercritical CO2 at 80 °C and 81 bar affords the corresponding triazole-containing BODIPY–ferrocene conjugates in high yields. The fluorescent and electrochemical properties of the compounds thus obtained were explored.

在 80 °C 和 81 bar 的超临界 CO2 条件下,铜催化叠氮-炔环化反应生成了相应的含三唑的 BODIPY-二茂铁共轭物。研究人员对由此获得的化合物的荧光和电化学特性进行了探讨。
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引用次数: 0
Ti-catalyzed heterometathetical condensation of N-sulfinylamines into sulfurdiimines 钛催化 N-亚磺酰基胺与硫代亚胺的异金属缩合反应
IF 1.8 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.028
Nikolai S. Bushkov , Andrey V. Rumyantsev , Anton A. Zhizhin , Ivan A. Godovikov , Pavel A. Zhizhko , Dmitry N. Zarubin

Well-defined silica-supported Ti imido complex (SiO)Ti(NBut)(Me2Pyr)(Py)2 (Me2Pyr = 2,5-dimethyl- pyrrolyl) catalyzes condensation of N-sulfinylanilines into sulfurdiimines via the oxo/imido heterometathesis providing a convenient synthetic route to functionalized sulfurdiimines.

定义明确的二氧化硅支撑 Ti 亚氨基配合物 (SiO)Ti(NBut)(Me2Pyr)(Py)2 (Me2Pyr = 2,5 二甲基吡咯基)通过氧化/亚氨基异构反应催化 N-亚磺酰苯胺缩合成硫代二亚胺,为功能化硫代二亚胺提供了一条便捷的合成路线。
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引用次数: 0
Hydrogenation of dinitrobenzenes over titania-supported palladium nanoparticles 在二氧化钛支撑的钯纳米粒子上氢化二硝基苯
IF 1.8 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.039
Elena V. Shuvalova, Olga A. Kirichenko

Catalysts of 1% Pd/TiO2 type were prepared via the deposition–precipitation of Pd polyhydroxo complexes followed by reduction with hydrogen at 23 °C. These catalysts were found to be active for the selective hydrogenation of m-dinitrobenzene into m-phenylenediamine at 25–50 °C and 0.5 MPa H2 in a batch reactor.

通过沉积-沉淀钯多羟基络合物,然后在 23 °C 下用氢气还原,制备了 1% Pd/TiO2 型催化剂。在间歇式反应器中,在 25-50 °C 和 0.5 兆帕 H2 条件下,这些催化剂对于间二硝基苯选择性氢化成间苯二胺具有活性。
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引用次数: 0
A concise synthesis of methyl dihydrojasmonate and methyl (5-methylidene-4-oxocyclopent-2-en-1-yl)acetate from D-glucose 以 D-葡萄糖为原料简易合成二氢茉莉酸甲酯和 (5-亚甲基-4-氧代环戊-2-烯-1-基)乙酸甲酯
IF 1.8 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.019
Sanjay Kumar , Yoshitaka Koseki , Takaaki Kamishima , Hitoshi Kasai

Methyl dihydrojasmonate and methyl (5-methylidene-4-oxocyclopent-2-en-1-yl)acetate were synthesized from 4-hydroxy-2-(hydroxymethyl)cyclopentenone, which, in turn, was obtained from D-glucose. The conditions for the key step, the Johnson–Claisen rearrangement, were optimized to get the maximum yield of the intermediate methyl 2-[2-methylene-3-oxo-5-(triisopropylsilyloxy)-cyclopentyl]acetate.

从 4-羟基-2-(羟甲基)环戊烯酮合成了二氢茉莉酮酸甲酯和(5-亚甲基-4-氧代环戊-2-烯-1-基)乙酸甲酯,而 4-羟基-2-(羟甲基)环戊烯酮又是从 D-葡萄糖中获得的。对关键步骤约翰逊-克莱森重排的条件进行了优化,以获得中间体 2-[2-亚甲基-3-氧代-5-(三异丙基硅氧基)-环戊基]乙酸甲酯的最大产率。
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引用次数: 0
Quercetin and dihydroquercetin are the activators of galactonolactone oxidase from Trypanosoma cruzi 槲皮素和双氢槲皮素是克鲁斯锥虫半乳糖内酯氧化酶的激活剂
IF 1.8 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.017
Andrey A. Chudin, Elena V. Kudryashova

The enhancing effect of natural flavonoids, quercetin and dihydroquercetin, on the catalytic activity of galactonolactone oxidase from Trypanosoma cruzi has been established.

天然类黄酮--槲皮素和双氢槲皮素--对克氏锥虫半乳糖内酯氧化酶催化活性的增强作用已经得到证实。
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引用次数: 0
A metal-templated synthesis of precursors for (2S)- and (2R)-2-(3-[18F]fluoropropyl)tyrosines as potential radiotracers for positron emission tomography (2S)-和(2R)-2-(3-[18F]氟丙基)酪氨酸作为正电子发射断层扫描潜在放射性示踪剂前体的金属催化合成方法
IF 1.8 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.008
Tat’yana F. Savel’yeva, Zalina T. Gugkaeva, Yulia V. Nelyubina, Alexander F. Smol’yakov, Margarita A. Moskalenko, Vladimir A. Larionov, Victor I. Maleev

New asymmetric metal-templated synthesis of enantiomers of (2S)- and (2R)-2-(3-[19F]fluoropropyl)tyrosine precursors were obtained based on a chiral NiII complex of the Schiff base derived from (S)-2-[N-(N’-benzylprolyl)amino]-benzaldehyde and racemic tyrosine in five steps. The free tyrosine derivatives which can be obtained upon decomplexation seem promising radiotracers for positron emission tomography imaging provided the introduction of 18F isotope.

基于(S)-2-[N-(N'-苄基丙基)氨基]-苯甲醛和外消旋酪氨酸衍生的希夫碱的手性 NiII 复合物,通过五个步骤获得了(2S)-和(2R)-2-(3-[19F]氟丙基)酪氨酸对映体的新的不对称金属催化合成。在引入 18F 同位素的情况下,解络合后得到的游离酪氨酸衍生物似乎很有希望成为正电子发射断层成像的放射性痕量物质。
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Mendeleev Communications
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