bluuebunny/crossref_metadata_2025_split huggingface dataset:
Toward more efficient and effective color quality control for the large‐scale offset printing process
Authors: Dziki Pawel , Pieszczek Lukasz , Daszykowski Michal 
Published: March 2024

AbstractThis study illustrates at‐line application of hyperspectral imaging in the visible range for quality control of large‐scale offset printing. In particular, the measurement stability of a competitive device is assessed and compared to traditional handheld and desktop spectrophotometers. The performance of the commercially available instruments was assessed based on collected spectra and their corresponding L*, a*, and b* values. The printing process was described by hyperspectral images (in visible range) of selected regions from template color fields acquired at 17 sampling occasions. Spectra constituting hyperspectral images were visualized and evaluated in the space of significant principal components obtained from the principal component analysis. Furthermore, confidence ellipses were constructed for each set of spectra characterizing a specific moment of the printing process. Comparing their mutual locations, shapes, orientations, and sizes enabled effective visualization of process variability and was more comprehensive regarding the classic approach based on information provided by desktop and handheld spectrometers.
Yttrium‐ and nitrogen‐doped NiCo phosphide nanosheets for high‐efficiency water electrolysis
Authors: Chen Guangliang , Xiang Huiyang , Guo Yingchun , Huang Jun , Chen Wei , Chen Zhuoyi , Li Tongtong , Ostrikov Kostya (Ken) 
Published: March 2024

AbstractEngineering high‐performance and low‐cost bifunctional catalysts for H2 (hydrogen evolution reaction [HER]) and O2 (oxygen evolution reaction [OER]) evolution under industrial electrocatalytic conditions remains challenging. Here, for the first time, we use the stronger electronegativity of a rare‐Earth yttrium ion (Y3+) to induce in situ NiCo‐layered double‐hydroxide nanosheets from NiCo foam (NCF) treated by a dielectric barrier discharge plasma NCF (PNCF), and then obtain nitrogen‐doped YNiCo phosphide (N‐YNiCoP/PNCF) after the phosphating process using radiofrequency plasma in nitrogen. The obtained N‐YNiCoP/PNCF has a large specific surface area, rich heterointerfaces, and an optimized electronic structure, inducing high electrocatalytic activity in HER (331 mV vs. 2000 mA cm−2) and OER (464 mV vs. 2000 mA cm−2) reactions in 1 M KOH electrolyte. X‐ray absorption spectroscopy and density functional theory quantum chemistry calculations reveal that the coordination number of CoNi decreased with the incorporation of Y atoms, which induce much shorter bonds of Ni and Co ions and promote long‐term stability of N‐YNiCoP in HER and OER under the simulated industrial conditions. Meanwhile, the CoN‐YP5 heterointerface formed by plasma N‐doping is the active center for overall water splitting. This work expands the applications of rare‐Earth elements in engineering bifunctional electrocatalysts and provides a new avenue for designing high‐performance transition‐metal‐based catalysts in the renewable energy field.
Cyclopropanation of Alkenes with Halodiazirines as Halocarbene Precursors in Continuous Flow
Authors: To Hoang‐Minh , Ollevier Thierry 
Published: March 2024

AbstractThe cyclopropanation reaction of alkenes with photolytically‐generated chlorocarbenes from chlorodiazirines is reported as an effective way to prepare substituted 3‐chloro‐3‐aryl‐cyclopropanes. This practical and efficient approach allows the synthesis of various 3‐chloro‐3‐aryl‐cyclopropanes (32 examples) in continuous flow in 5‐minute residence time under light‐emitting diode (LED) irradiation. The conditions using 380 nm LED irradiation were successfully extended to the synthesis of substituted 3‐bromo‐3‐aryl‐cyclopropanes (3 examples).
Recognition of Amino Acid Salts by Temperature‐Dependent Allosteric Binding with Stereodynamic Urea Receptors
Authors: Kimura Yuki , Matsumura Kotaro , Ono Kosuke , Tsuchido Yoshitaka , Kawai Hidetoshi 
Published: March 2024

AbstractPositive homotropic artificial allosteric systems are important for the regulation of cooperativity, selectivity and nonlinear amplification. Stereodynamic homotropic allosteric receptors can transmit and amplify induced chirality by the first ligand binding to axial chirality between two chromophores. We herein report stereodynamic allosteric urea receptors consisting of a rotational shaft as the axial chirality unit, terphenyl units as structural transmission sites and four urea units as binding sites. NMR titration experiments revealed that the receptor can bind two carboxylate guests in a positive homotropic allosteric manner attributed to the inactivation by intramolecular hydrogen‐bonding between urea units within the receptor. In addition, the VT‐CD spectra observed upon binding of the urea receptor with l‐ or D‐amino acid salts in MeCN showed interesting temperature‐dependent Cotton effects, based on the differences of the receptor shaft unit and the guest structure. The successful discrimination of hydrocarbon‐based side chains of amino acid salts indicated that the input of chiral and steric information for the guest was amplified as outputs of the Cotton effect and the temperature‐dependence of VT‐CD spectra through cooperativity of positive allosteric binding.
Self‐Assembly Strategy for Constructing Porous Boron and Nitrogen Co‐Doped Carbon as an Efficient ORR Electrocatalyst toward Zinc‐Air Battery
Authors: Fu Yuying , Cao Cancan , Song Wenrui , Li Bo , Sun Xuzhuo Z. , Wang Zhengxi X. , Fan Liuqing , Chen Jing 
Published: March 2024

AbstractCarbon nanomaterials doped with N and B could activate nearby carbon atoms to promote charge polarization through the synergistic coupling effect between N and B atoms, thus facilitating adsorption of O2 and weakening O−O bond to enhance oxygen reduction reaction. Herein, a simple and controllable self‐assembly strategy is applied to synthesize porous B, N co‐doped carbon‐based catalysts (BCN‐P), which employs the macrocyclic molecule cucurbit[7]uril (CB7) as nitrogen source, and 3D aromatic‐like closo‐[B12H12]2− as boron source. In addition, polystyrene microspheres are added to help introduce porous structure to expose more active sites. Benefitting from porous structures and the synergistic coupling effect between N and B atoms, BCN‐P has a high onset potential (Eonset=0.846 V) and half‐wave potential (E1/2=0.74 V) in alkaline media. The zinc‐air battery assembled with BCN‐P shows high operating voltage (1.42 V), peak power density (128.7 mW cm−2) and stable charge/discharge cycles, which is even comparable with Pt/C.
Synthesis and Functionalization of Azetidine‐Containing Small Macrocyclic Peptides
Authors: Saunders George J. , Spring Sam A. , Jayawant Eleanor , Wilkening Ina , Roesner Stefan , Clarkson Guy J. , Dixon Ann M. , Notman Rebecca , Shipman Michael 
Published: March 2024

AbstractCyclic peptides are increasingly important structures in drugs but their development can be impeded by difficulties associated with their synthesis. Here, we introduce the 3‐aminoazetidine (3‐AAz) subunit as a new turn‐inducing element for the efficient synthesis of small head‐to‐tail cyclic peptides. Greatly improved cyclizations of tetra‐, penta‐ and hexapeptides (28 examples) under standard reaction conditions are achieved by introduction of this element within the linear peptide precursor. Post‐cyclization deprotection of the amino acid side chains with strong acid is realized without degradation of the strained four‐membered azetidine. A special feature of this chemistry is that further late‐stage modification of the resultant macrocyclic peptides can be achieved via the 3‐AAz unit. This is done by: (i) chemoselective deprotection and substitution at the azetidine nitrogen, or by (ii) a click‐based approach employing a 2‐propynyl carbamate on the azetidine nitrogen. In this way, a range of dye and biotin tagged macrocycles are readily produced. Structural insights gained by XRD analysis of a cyclic tetrapeptide indicate that the azetidine ring encourages access to the less stable, all‐trans conformation. Moreover, introduction of a 3‐AAz into a representative cyclohexapeptide improves stability towards proteases compared to the homodetic macrocycle.
Effect of Benzo‐Annelation on Triplet State Energies in Polycyclic Conjugated Hydrocarbons
Authors: Radenković Slavko , Đorđević Slađana , Nikolendžić Marijana 
Published: March 2024

AbstractIn a series of earlier studies, the effect of benzo‐annelation was found to be a useful tool for tuning the aromaticity in polycyclic conjugated compounds to desired level. In this work we studied the (anti)aromaticity of benzo‐annelated derivatives of three conjugated hydrocarbons (anthracene, fluoranthene and biphenylene) in their lowest lying singlet (S0) and triplet (T1) states by means of the energy effect (ef), harmonic oscillator model of aromaticity (HOMA), multicentre delocalization indices (MCI), magnetically induced current densities (MICDs) and nucleus independent chemical shifts (NICS). We showed that benzo‐annelation is a topology‐based effect which can be used to modify the T1 state excitation energies (E(T1)). A quantitative model was established being able to accurately predict the E(T1) based only on the numbers of angularly, linearly and geminally annelated benzene rings. In addition, it was demonstrated that the E(T1) can be directly related to the (anti)aromatic character of the central ring in the studied molecules in their S0 state.
Dehydro[12]‐ and [18]annulene‐Fused Ball‐Shaped Ruthenium Complex Oligomers: Synthesis, Aromatic/Antiaromatic Effect, and Symmetry for Near‐Infrared Optical Properties
Authors: Ishikawa Sari , Maeda Hajime , Segi Masahito , Furuyama Taniyuki 
Published: March 2024

AbstractThe appropriate arrangement of near‐infrared (NIR) chromophores allows for the modification of the peak wavelength in the NIR region and efficient use of NIR light. However, the preparation of novel NIR chromophores using simple procedures remains a formidable challenge. Herein, we report the synthesis of ball‐shaped ruthenium complex oligomers. The metal complexes can be synthesized in a single step and interact strongly with NIR light. Alkyne‐substituted low‐symmetry ball‐shaped ruthenium complexes were synthesized and subjected to Eglinton coupling to obtain dehydro[12] and [18]annulene‐fused dimers and trimers. Fine‐tuning of the reaction conditions led to the selective synthesis of the target oligomers. NMR spectroscopy confirmed that the 18π‐aromatic and 12π‐antiaromatic properties of the annulene influenced the ruthenium complex chromophore, and magnetic circular dichroism spectroscopy showed changes in the electronic structure of their excited state owing to molecular‐symmetry differences. The absorption coefficient in the NIR region of the absorption spectra of the oligomers increased significantly, supporting the efficient use of light by oligomerization. The formation of oligomers using ball‐shaped metal complexes is a simple and effective strategy for controlling NIR optical properties.
Polymer Supported Nitrogen‐Bridged Symmetrical Binuclear Dioxidomolybdenum(VI) Complexes and Their Homogeneous Analogues as Potential Catalysts for Efficient Synthesis of 2‐Amino‐3‐Cyano‐4H‐Chromenes/Pyrans
Authors: Maurya Mannar R. , Nandi Monojit , Kumar Naveen , Avecilla Fernando 
Published: March 2024

AbstractReaction of 2‐chloromethyl‐1H‐benzimidazole with known intermediates (i–iii), prepared from diaminoguanidine hydrochloride with salicylaldehyde, 5‐bromosalicylaldehyde or 3,5‐di‐tert‐butylsalicylaldehyde, in the presence of triethylamine (NEt3) led to the formation of benzimidazole appended new ligands, H4L1‐H4L3 (I–III). The homogeneous nitrogen‐bridged symmetrical binuclear complexes, [(MoVIO2)2(L1)(H2O)2] (1), [(MoVIO2)2(L2)(H2O)2] (2) and [(MoVIO2)2(L3)(MeOH)2] (3) have been isolated by reacting these ligands with [MoVIO2(acac)2] in a 1 : 2 molar ratio in refluxing methanol. Using 1 : 1 (ligand to Mo precursor) molar ratio under above reaction conditions resulted in the corresponding mononuclear complexes, [MoVIO2(H2L1)(MeOH)] (4), [MoVIO2(H2L2)(H2O)] (5) and [MoVIO2(H2L3)(MeOH)] (6). The binuclear heterogeneous compounds [(MoVIO2)2(L1)(DMF)2]@PS (PS‐1), [(MoVIO2)2(L2)(DMF)2]@PS (PS‐2) and [(MoVIO2)2(L3)(DMF)2]@PS (PS‐3) have been obtained by immobilization of 1–3 onto chloromethylated polystyrene (PS) beads. All synthesized ligands, homogeneous as well as supported compounds have been characterized by elemental analyses and various spectroscopic methods. Single crystal X‐ray diffraction study of complexes 1 and 3 confirms their nitrogen‐bridged symmetrical binuclear structures while 4 is mononuclear. Heterogeneous compounds (PS‐1‐PS‐3) have further been studied by microwave plasma atomic emission spectroscopy, X‐ray photoelectron spectroscopy, and field emission scanning electron microscopy along with energy dispersive spectroscopy. These compounds (homogeneous and heterogeneous) were explored for catalytic applications to one‐pot multicomponent reactions (MCRs) for efficient synthesis of biologically active 2‐amino‐3‐cyano‐4H‐chromenes/pyrans (21 examples). Optimising various reaction parameters helped in achieving as high as 97 % yields of products. Though, only half equivalent of the binuclear complexes (1‐3) was required compared to mononuclear analogues (4‐6) to achieve comparable yields, heterogeneous catalysts have an added advantage due to their stability and recyclability. Suitable reaction mechanism has also been proposed based on isolated intermediates.
Random Terpolymer of Carbon Dioxide, Butadiene and Epoxides: Synthesis, Functionalization and Degradability
Authors: Wang Zi , Zheng Wuyi , Yue Sicong , Chen Kaihao , Ling Jun , Ni Xufeng 
Published: March 2024

Comprehensive SummaryThe utilization of carbon dioxide (CO2) as a C1 feedstock is consistently attractive, especially in the preparation of sustainable polymeric materials. In this contribution, a terpolymer of CO2, 1,3‐butadiene (BD) and epoxide is synthesized by scandium triflate catalyzed cationic ring‐opening copolymerization of α‐ethylidene‐δ‐vinyl‐δ‐valerolactone (EVL), an intermediate derived from CO2 and BD, with epoxides. The obtained terpolymer with a CO2 content of 22 mol% has a number‐average molecular weight (Mn) up to 7.8 kg/mol and a dispersity (Đ) of 2.4. The reactivity ratios of EVL and cyclohexene oxide (CHO) are determined as 0.01 and 1.07, respectively, suggesting random characteristic of the terpolymer. The preserved C=C double bonds from BD allow for the further modification of the terpolymer by photoinitiated crosslinking. The yielded networks are fluorescent and degradable. This method offers enhanced versatility to the synthesis and additional functionalization of CO2‐based polymers.
Chemical Synthesis of a Key Precursor Relevant to the Tetrasaccharide Repeating Unit from Treponema mediumATCC 700293
Authors: Sun Wenbin , Tian Guangzong , Ding Meiru , Qin Chunjun , Zou Xiaopeng , Hu Jing , Yin Jian 
Published: March 2024

Comprehensive SummaryTreponema is a Gram‐negative anaerobic bacterium, among which the pathogenic Treponema can cause various diseases, such as venereal syphilis (Treponema pallidum), yaws (Treponema carateum), and oral diseases (Treponema denticola and Treponema medium). Although different from conventional lipopolysaccharides, the extracellular glycoconjugate of Treponema may still be a potential antigen and provide a candidate for vaccine development. Hence, we completed the first chemical synthesis of Treponema medium ATCC 700293 tetrasaccharide precursor containing L‐ornithine (L‐Orn) and D‐aspartic acid (D‐Asp) derivatives. The efficiency of non‐reducing end disaccharide formation has been improved by optimizing the assembly of the protecting groups in the donors and acceptors. Our [3+1] glycosylation strategy attempted to reduce the length of the acceptor to increase the nucleophilicity of the hydroxyl group, thereby improving the efficiency of synthesizing the target tetrasaccharide. The L‐Orn derivative was introduced at the final stage due to its influence on the glycosylation stereospecificity and efficiency. Therefore, the successful introduction of two amino acid derivatives and the synthesis of a tetrasaccharide precursor with complex functional‐group modifications have provided valuable insights for synthesizing other complex bacterial glycans.
Early exposure to maternal stress and risk for atopic dermatitis in children: A systematic review and meta‐analysis
Authors: Ai Yuan , Huang Jichong , Zhu Ting Ting 
Published: March 2024

AbstractBackgroundThe incidence of atopic dermatitis (AD) in children is increasing. Early exposure to stress factors may be associated with the AD development. This study aimed to summarize studies that reported an association between stress exposure and AD development in later life.Methods and findingsA comprehensive literature search was performed using online databases (PubMed, EMBASE, PsycINFO, and Web of Science) for articles published up to May 1, 2023. Eligible studies were screened and selected based on the inclusion criteria. We incorporated cohort or case‐control studies published in English which explored the relationship between stress experienced by parents or children and AD. The pooled odds ratio (OR) was calculated according to the type of stress using a random‐effects model. Twenty‐two studies were included. AD was related to maternal distress (OR 1.29, 95% Confidence Interval [CI]: 1.13–1.47), maternal anxiety (OR 1.31, 95% CI: 1.18–1.46), and negative life events (OR 2.00, 95% CI: 1.46–2.76). Maternal depression during pregnancy was associated with AD (OR 1.21, 95% CI: 1.09–1.33), whereas no significant association was found for postpartum depression. Research on stress experienced by paternal or children is scare.ConclusionsEarly maternal stress may potentially elevate the risk of AD in their offspring. Importantly, rigorously designed studies are required to corroborate the link between maternal stress and AD in children. These studies should aim to gather insights about the impact of stress during specific trimesters of pregnancy, postnatal stress, and paternal stress, and to identify potential prevention strategies.
Recent advances in energy storage and applications of form‐stable phase change materials with recyclable skeleton
Authors: Jia Yuan , Jiang Yaoting , Pan Yunshi , Zou Xinmei , Zhang Qian , Gao Xiaojian , Zhang Jingxi , Yu Kunyang , Yang Yingzi , Liu Yushi 
Published: March 2024

AbstractWith the expansion of the global population, the energy shortage is becoming increasingly acute. Phase change materials (PCMs) are considered green and efficient mediums for thermal energy storage, but the leakage problem caused by volume instability during phase change limits their application. Encapsulating PCMs with supporting materials can effectively avoid leakage, but most supporting materials are expensive and consume huge of natural resources. Carbon materials, which are rich and renewable resources, can be used as economical and environmentally friendly supporting skeletons to prepare form‐stable PCMs. Although many researchers have begun to use recyclable materials especially various derivatives of carbon as supporting skeletons to prepare form‐stable PCMs, the preparation methods, thermophysical properties and applications of form‐stable PCMs with recyclable skeletons have rarely been systematically summarized yet. Form‐stable PCMs with a recyclable skeleton can be used as green and efficient thermal storage materials due to their high heat storage capacity and good thermophysical stability after 2000 thermal cycles. This review investigates the effects of recyclable skeletons on the thermophysical properties including phase change temperature, latent heat, thermal conductivity, supercooling, and thermal cycling reliability. Four major kinds of recyclable skeletons are focused on: biomass, biochar, industrial by‐products as well as waste incineration ash. Additionally, the application scales of form‐stable PCMs with recyclable skeletons are explicated in depth. Moreover, the main challenges confronted by form‐stable PCMs with recyclable skeletons are discussed, and future research trends are proposed. This article provides a systematic review of the form‐stable PCMs with recyclable skeletons, giving significant guidance for further reducing carbon emissions and promoting the development of sustainable energy.
Transition Metal‐Cross‐Linked‐Starch Aerogel‐Derived Porous Carbon‐Based Monolithic Chainmail Electrodes for High‐Current‐Density and Durable Alkaline Water Splitting
Authors: Zhao Yaoyao , Zhang Zhengguo , Wang Fang , Min Shixiong 
Published: March 2024

AbstractA porous carbon‐based monolithic chainmail electrode, namely Co2P@CSA, is fabricated via direct carbonization of Co2+‐cross‐linked‐starch aerogel (Co2+‐SA) followed by low‐temperature vapor phosphorization. During successive carbonization‐phosphorization, the SA framework is formulated into 3D hierarchically porous carbon membrane matrix comprising hollow open carbon microspheres while the cross‐linked Co species are converted into uniformly distributed carbon‐encapsulated Co2P nanoparticles on carbon microspheres. Thanks to the high porosity, excellent electrolyte wettability, unique chainmail structure, and good mechanical strength, the monolithic Co2P@CSA can be directly used as a binder‐free bifunctional electrocatalyst for alkaline water splitting, and it can afford a high current density of 100 mA cm−2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at low overpotentials of 140.0 and 305.5 mV, respectively, with outstanding stability at 50 mA cm−2 for >30 h. More significantly, an alkaline electrolyzer assembled using Co2P@CSA achieves a current density of 100 mA cm−2 for overall water splitting (OWS) at a cell voltage of 1.94 V with unit Faradaic efficiency and provides a high solar‐to‐hydrogen (STH) conversion efficiency of 13.4 % when driven by a commercial silicon solar cell. This work offers an effective strategy towards cost‐effective fabrication of high‐performance carbon‐based monolithic chainmail electrocatalysts for energy conversion reactions.