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Cover Picture: (Helv. Chim. Acta 5/2025) 封面图片：（Helv.）詹。Acta 5/2025)
IF 1.5 4区 化学
Helvetica Chimica Acta Pub Date : 2025-05-15 DOI: 10.1002/hlca.202570501
{"title":"Cover Picture: (Helv. Chim. Acta 5/2025)","authors":"","doi":"10.1002/hlca.202570501","DOIUrl":"https://doi.org/10.1002/hlca.202570501","url":null,"abstract":"<p>\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure>\u0000 </p>","PeriodicalId":12842,"journal":{"name":"Helvetica Chimica Acta","volume":"108 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hlca.202570501","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Efficient Polymer Functionalization by Means of Extreme Ultraviolet 极紫外技术在高分子功能化中的应用
IF 1.5 4区 化学
Helvetica Chimica Acta Pub Date : 2025-04-26 DOI: 10.1002/hlca.202400100
Di Qu, Minglei Wang, Léonard Bezinge, Celine Hensky, Filippo Longo, Claudia Masucci, Mirushe Suloska, Jing Wang, Davide Bleiner
{"title":"Efficient Polymer Functionalization by Means of Extreme Ultraviolet","authors":"Di Qu,&nbsp;Minglei Wang,&nbsp;Léonard Bezinge,&nbsp;Celine Hensky,&nbsp;Filippo Longo,&nbsp;Claudia Masucci,&nbsp;Mirushe Suloska,&nbsp;Jing Wang,&nbsp;Davide Bleiner","doi":"10.1002/hlca.202400100","DOIUrl":"https://doi.org/10.1002/hlca.202400100","url":null,"abstract":"<p>Extreme ultraviolet (XUV) radiation is highly efficient for functionalization of solid materials by means of pronounced radical formation. To prevent collective effects, and study single photon effects, a low-fluence XUV source with 200 μJ/cm<sup>2</sup> was used to irradiate polymers such as poly-methyl methacrylate (PMMA) and poly-tetrafluoroethylene (PTFE). The unexposed and XUV-exposed sample domains were analyzed with time-of-flight secondary ion mass spectrometry (TOF-SIMS), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The findings show that XUV photons drive photochemical modification of the surface, fragmentation, and ionization of the desorbed products. Besides a theoretical analysis, the XUV-induced surface modification of PTFE is discussed a new application for surface functionalization.</p>","PeriodicalId":12842,"journal":{"name":"Helvetica Chimica Acta","volume":"108 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cover Picture: (Helv. Chim. Acta 4/2025) 封面图片：（Helv.）詹。Acta 4/2025)
IF 1.5 4区 化学
Helvetica Chimica Acta Pub Date : 2025-04-16 DOI: 10.1002/hlca.202570401
{"title":"Cover Picture: (Helv. Chim. Acta 4/2025)","authors":"","doi":"10.1002/hlca.202570401","DOIUrl":"https://doi.org/10.1002/hlca.202570401","url":null,"abstract":"<p>\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure>\u0000 </p>","PeriodicalId":12842,"journal":{"name":"Helvetica Chimica Acta","volume":"108 4","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hlca.202570401","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhanced Photocatalytic Alkylation using Mg(SPh)2: The Role of Lewis Acidity in Catalyst Activity Mg(SPh)2增强光催化烷基化反应：刘易斯酸对催化剂活性的影响
IF 1.5 4区 化学
Helvetica Chimica Acta Pub Date : 2025-03-29 DOI: 10.1002/hlca.202400207
Yasuhiro Yamashita, Tomoya Hisada, Yuki Sato, Shū Kobayashi
{"title":"Enhanced Photocatalytic Alkylation using Mg(SPh)2: The Role of Lewis Acidity in Catalyst Activity","authors":"Yasuhiro Yamashita,&nbsp;Tomoya Hisada,&nbsp;Yuki Sato,&nbsp;Shū Kobayashi","doi":"10.1002/hlca.202400207","DOIUrl":"https://doi.org/10.1002/hlca.202400207","url":null,"abstract":"<p>The role of Mg(SPh)<sub>2</sub> on photocatalytic alkylation of an active methylene with a nonactivated alkene was investigated. Kinetic studies indicate that one-electron oxidation of a Mg enolate is the rate-determining step. ESR experiments suggest an interaction between Lewis acidic metals and a radical anion species of 4CzIPN. These results suggest that the higher Lewis acidity of Mg(SPh)<sub>2</sub> stabilizes the 4CzIPN radical anion species to enhance its relative abundance and might influence both the one-electron oxidation step and the radical addition step in the catalytic cycle, leading to enhanced reaction efficiency.</p>","PeriodicalId":12842,"journal":{"name":"Helvetica Chimica Acta","volume":"108 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hlca.202400207","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photocleavable Porphyrin Derivatives for Quantum Optics 用于量子光学的光可切割卟啉衍生物
IF 1.5 4区 化学
Helvetica Chimica Acta Pub Date : 2025-03-26 DOI: 10.1002/hlca.202500022
Olga Rybakova, Josef Reisinger, Philipp Rieser, Philipp Geyer, Stefan Gerlich, Markus Arndt, Amal Kumar, Daniel Häussinger, Marcel Mayor, Valentin Köhler
{"title":"Photocleavable Porphyrin Derivatives for Quantum Optics","authors":"Olga Rybakova,&nbsp;Josef Reisinger,&nbsp;Philipp Rieser,&nbsp;Philipp Geyer,&nbsp;Stefan Gerlich,&nbsp;Markus Arndt,&nbsp;Amal Kumar,&nbsp;Daniel Häussinger,&nbsp;Marcel Mayor,&nbsp;Valentin Köhler","doi":"10.1002/hlca.202500022","DOIUrl":"https://doi.org/10.1002/hlca.202500022","url":null,"abstract":"<p>Optical control of molecular beams is intriguing as it promises to become a new tool for mass spectrometry and quantum interferometry, where a single or two photons deterministically remove a tailored tag from a larger molecular structure, e. g., a polypeptide. This cleavage process can change the charge state of the macromolecule, provide reporting signals for both fragments by mass spectrometry and it can selectively remove the fragments from a molecular beam by the momentum recoil generated in the dissociation process. Here, we explore a series of porphyrin derivatives as candidates for photocleavage in the gas phase. They share a large, conjugated core which promises a high absorption cross section for visible light. We present the individualization and beam formation of candidate molecules and study their photo-dissociation under tunable, visible radiation. We observe a significant wavelength shift and broadening in the photocleavage cross section for molecules in the gas phase compared to those in solution and we find that a single photon can suffice to trigger the cleavage process.</p>","PeriodicalId":12842,"journal":{"name":"Helvetica Chimica Acta","volume":"108 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hlca.202500022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Understanding the Structure of Protonated Box Ligands: Insights from Spectroscopy and Computational Studies 理解质子化盒子配体的结构：来自光谱学和计算研究的见解
IF 1.5 4区 化学
Helvetica Chimica Acta Pub Date : 2025-03-23 DOI: 10.1002/hlca.202400205
Vladimir Gorbachev, Lara van Tetering, Jonathan Martens, Jos Oomens, Giel Berden, Alexandra Tsybizova, Peter Chen
{"title":"Understanding the Structure of Protonated Box Ligands: Insights from Spectroscopy and Computational Studies","authors":"Vladimir Gorbachev,&nbsp;Lara van Tetering,&nbsp;Jonathan Martens,&nbsp;Jos Oomens,&nbsp;Giel Berden,&nbsp;Alexandra Tsybizova,&nbsp;Peter Chen","doi":"10.1002/hlca.202400205","DOIUrl":"https://doi.org/10.1002/hlca.202400205","url":null,"abstract":"<p>Protonation and tautomerization significantly impact the conformational landscape and non-covalent interactions in bis(oxazoline) (BOX) ligands, which are crucial for their applications in catalysis. These interactions influence properties such as binding affinity and catalytic efficiency. While tautomerization has been reported for neutral BOX ligands, its role in protonated forms remains less understood. Here we report the structural and spectroscopic characterization of (S,S−Ph-BOX)H<sup>+</sup> and its tautomerization-resistant derivative (S,S−Ph-diMeBOX)H<sup>+</sup>. We show through IRMPD spectroscopy and TIMS experiments, combined with DFT calculations that (S,S−Ph-BOX)H<sup>+</sup> is present in its tautomeric form, while a broader conformational landscape is observed for (S,S−Ph-diMeBOX)H<sup>+</sup>, in which an N−H⋅⋅⋅N proton-shared conformer is identified. These findings provide a deeper understanding of the relationship between tautomerization and non-covalent interactions in protonated BOX ligands, offering insights for the design of catalytic systems.</p>","PeriodicalId":12842,"journal":{"name":"Helvetica Chimica Acta","volume":"108 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Approaches to Commercial Sandalwood Odorants from Renewable Sources 从可再生资源中提取商用檀香气味剂的方法
IF 1.5 4区 化学
Helvetica Chimica Acta Pub Date : 2025-03-19 DOI: 10.1002/hlca.202500010
Anthony A. Birkbeck, Christian Chapuis, Michel Schalk
{"title":"Approaches to Commercial Sandalwood Odorants from Renewable Sources","authors":"Anthony A. Birkbeck,&nbsp;Christian Chapuis,&nbsp;Michel Schalk","doi":"10.1002/hlca.202500010","DOIUrl":"https://doi.org/10.1002/hlca.202500010","url":null,"abstract":"<p>The rich chemistry of East Indian Sandalwood oil has fascinated chemists for over a century. Whilst the synthesis on industrial scale of the principal odour vector (−)-(<i>Z</i>)-β-Santalol <b>2</b>, has resisted all attempts to date, many synthetic fragrant sandalwood ingredients have been discovered and manufactured on industrial scale. This precious wood is still listed as endangered and appears on the CITES red list, despite an increased number of plantations being developed. This review will focus on the interesting chemistry of <i>Santalum album</i> (<span>Linn.</span>) essential oil and the subsequent efforts by researchers to find a viable substitute for this highly appreciated oil both by investigating novel structures and using biotech approaches. The emphasis will be on the approaches to these highly appreciated odorants made from renewable resources that are currently manufactured on multi-MT scale. Lesser emphasis will be placed on close structural analogues that have not been commercially successful.</p>","PeriodicalId":12842,"journal":{"name":"Helvetica Chimica Acta","volume":"108 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
How Native Are Peptides After Activation by Collisions or Photons? A Gas-Phase FRET Study 在碰撞或光子激活后肽的天然性如何？气相FRET研究
IF 1.5 4区 化学
Helvetica Chimica Acta Pub Date : 2025-03-19 DOI: 10.1002/hlca.202500043
Kim Greis, Linus F. Busse, Lukas R. Benzenberg, Ri Wu, Renato Zenobi
{"title":"How Native Are Peptides After Activation by Collisions or Photons? A Gas-Phase FRET Study","authors":"Kim Greis,&nbsp;Linus F. Busse,&nbsp;Lukas R. Benzenberg,&nbsp;Ri Wu,&nbsp;Renato Zenobi","doi":"10.1002/hlca.202500043","DOIUrl":"https://doi.org/10.1002/hlca.202500043","url":null,"abstract":"<p>Native mass spectrometry ionizes biomolecules from aqueous buffered solutions using electrospray ionization. Collisions and lasers are often used to study the structures of such native biomolecular ions. While structural changes upon collisions have been studied in more detail, interactions with photons mostly comprise fragmentation. It remains unclear to what degree biomolecular ions undergo unfolding until cleavage. Here, gas-phase Förster resonance energy transfer (FRET) is used to study fluorescence lifetimes of a 32-residue α-helical peptide to monitor peptide unfolding. Increases in lifetime of up to 1.2 ns per charge are observed for different charge states, showing that a low charge is necessary for peptides to retain a compact structure. Increases in lifetime by up to 0.5 ns are observed upon collisional and laser-based activation and show that the peptide is partially unfolding upon activation. The results contribute to understanding the unfolding dynamics of biomolecules upon activation in mass spectrometry experiments.</p>","PeriodicalId":12842,"journal":{"name":"Helvetica Chimica Acta","volume":"108 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cover Picture: (Helv. Chim. Acta 3/2025) 封面图片：（Helv.）詹。Acta 3/2025)
IF 1.5 4区 化学
Helvetica Chimica Acta Pub Date : 2025-03-14 DOI: 10.1002/hlca.202570301
{"title":"Cover Picture: (Helv. Chim. Acta 3/2025)","authors":"","doi":"10.1002/hlca.202570301","DOIUrl":"https://doi.org/10.1002/hlca.202570301","url":null,"abstract":"<p>\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure>\u0000 </p>","PeriodicalId":12842,"journal":{"name":"Helvetica Chimica Acta","volume":"108 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hlca.202570301","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
First Report of Hydrolysis of Dihydrazides into Carboxylates in Mild Aqueous Conditions 二肼类化合物在温和水条件下水解成羧酸盐的首次报道
IF 1.5 4区 化学
Helvetica Chimica Acta Pub Date : 2025-03-10 DOI: 10.1002/hlca.202400086
Kilian Caillaud, Kilian Pouchelon, Fernande Da Cruz-Boisson, Élodie Fromentin, Agnès Crépet, Catherine Ladavière
{"title":"First Report of Hydrolysis of Dihydrazides into Carboxylates in Mild Aqueous Conditions","authors":"Kilian Caillaud,&nbsp;Kilian Pouchelon,&nbsp;Fernande Da Cruz-Boisson,&nbsp;Élodie Fromentin,&nbsp;Agnès Crépet,&nbsp;Catherine Ladavière","doi":"10.1002/hlca.202400086","DOIUrl":"https://doi.org/10.1002/hlca.202400086","url":null,"abstract":"<p>The hydrolysis of dihydrazides was studied at different pH values in water at 25 °C. The resulting species were analyzed by HPLC, <sup>1</sup>H-NMR, and MALDI-TOF mass spectrometry. Among these species, unexpected molecules bearing carboxylate moieties were detected. Based on this analysis, a 2-step hydrolysis mechanism was proposed involving the formation of cyclic and linear intermediates before the addition of a water molecule to lead to carboxylate moieties. The first step was shown to be rate-determining and catalyzed in acidic conditions. To the best of our knowledge, this study shows for the first time that the hydrolysis of some dihydrazides can spontaneously occur in mild aqueous conditions, contrary to monohydrazides which do not reveal such a hydrolysis in same conditions. This draws attention to an overlooked degradation which might need more consideration, and possibly highlights new ways of soft hydrolysis conditions.</p>","PeriodicalId":12842,"journal":{"name":"Helvetica Chimica Acta","volume":"108 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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