Helvetica Chimica Acta最新文献_第2页

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, Josef Reisinger, Philipp Rieser, Philipp Geyer, Stefan Gerlich, Markus Arndt, Amal Kumar, Daniel Häussinger, Marcel Mayor, Valentin Köhler","doi":"10.1002/hlca.202500022","DOIUrl":"https://doi.org/10.1002/hlca.202500022","url":null,"abstract":"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.","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

Effect of Gel Alkalinity on the Catalytic Properties of PdCu/NaY Zeolites for Methyl Nitrite Carbonylation to Dimethyl Carbonate 凝胶碱度对PdCu/NaY分子筛催化亚硝酸盐甲酯羰基化制碳酸二甲酯性能的影响

IF 1.5 4区化学

Helvetica Chimica Acta Pub Date : 2025-03-25 DOI: 10.1002/hlca.202500015

Sendaner Adelieti, Si-Qi Wu, Xian-Hao Wu, Rong Guo, Jian-Shan Chen, Zhi-Fang Diao, Zi-Yi Miao, Zhen-Hong Han, Ye-Yan Qin, Yuan-Gen Yao

{"title":"Effect of Gel Alkalinity on the Catalytic Properties of PdCu/NaY Zeolites for Methyl Nitrite Carbonylation to Dimethyl Carbonate","authors":"Sendaner Adelieti, Si-Qi Wu, Xian-Hao Wu, Rong Guo, Jian-Shan Chen, Zhi-Fang Diao, Zi-Yi Miao, Zhen-Hong Han, Ye-Yan Qin, Yuan-Gen Yao","doi":"10.1002/hlca.202500015","DOIUrl":"https://doi.org/10.1002/hlca.202500015","url":null,"abstract":"The carbonylation of methyl nitrite (MN) to synthesize dimethyl carbonate (DMC) is a promising route, but the lack of efficient and stable catalysts remains a major challenge for large-scale applications. In this study, by adjusting the alkalinity of the initial gel, NaY zeolites with tunable acidity were synthesized, and the amount of Lewis acid sites was optimized. Appropriate amounts of Lewis acid sites facilitated the interaction between NaY zeolites and Pd species, which was beneficial for stabilizing the oxidation state of Pd and promoting CO adsorption and activation, thereby contributing to the formation of the key intermediate *COOCH3. The catalyst PdCu/NaY-1 (alkalinity in the initial gel Na2O=9) exhibited significant improvement in catalytic performance for the synthesis of DMC, with the WTYDMC of 1604 g kgcat−1⋅h−1, the conversion of CO to DMC (CCO) of 88.7 %, and the DMC selectivity based on CO (SDMC/CO) up to 100 %.","PeriodicalId":12842,"journal":{"name":"Helvetica Chimica Acta","volume":"108 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144292946","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

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, Lara van Tetering, Jonathan Martens, Jos Oomens, Giel Berden, Alexandra Tsybizova, Peter Chen","doi":"10.1002/hlca.202400205","DOIUrl":"https://doi.org/10.1002/hlca.202400205","url":null,"abstract":"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+ and its tautomerization-resistant derivative (S,S−Ph-diMeBOX)H+. We show through IRMPD spectroscopy and TIMS experiments, combined with DFT calculations that (S,S−Ph-BOX)H+ is present in its tautomeric form, while a broader conformational landscape is observed for (S,S−Ph-diMeBOX)H+, 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.","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

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

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

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

引用次数: 0

Electric Dipole Polarizability Calculation for Periodic and Non-Periodic Systems using Atomic-Orbitals-based Linear Response Theory 利用基于原子轨道的线性响应理论计算周期和非周期系统的电偶极极化率

IF 1.5 4区化学

Helvetica Chimica Acta Pub Date : 2025-03-07 DOI: 10.1002/hlca.202400130

Ravi Kumar, Sandra Luber

{"title":"Electric Dipole Polarizability Calculation for Periodic and Non-Periodic Systems using Atomic-Orbitals-based Linear Response Theory","authors":"Ravi Kumar, Sandra Luber","doi":"10.1002/hlca.202400130","DOIUrl":"https://doi.org/10.1002/hlca.202400130","url":null,"abstract":"We present electric dipole polarizability calculations employing atomic-orbitals based linear response theory within the Kohn-Sham Density Functional Theory (KS-DFT) framework, considering both non-periodic and periodic boundary conditions. We adopt the optimization scheme introduced by T. Helgaker et al. in Chemical Physics Letters 327, 397 (2000) for the single-electron atomic-orbitals density matrix. We conduct a comparative analysis between the static polarizability computed using atomic orbitals-based and previously implemented molecular orbitals-based methods. In our calculations involving periodic boundary conditions, we implement polarizability calculation using velocity representation of the electric dipole operator in atomic orbitals-based algorithm, subsequently comparing the results with those computed using the Berry-phase formulation and velocity representation in molecular orbitals-based algorithm. We investigate 10 small and medium-sized molecules in the gas phase, analyze liquid-phase systems with up to 256 water molecules, and the solid-state structures of anatase TiO2 and bulk WO3. All polarizability results obtained from the AO-based solver exhibit good agreement with MO-based results. From our example calculations, we find that the AO-based solver exhibits better computational scaling and less memory demand than the MO-based solvers, which makes it better suited for very large systems.","PeriodicalId":12842,"journal":{"name":"Helvetica Chimica Acta","volume":"108 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074598","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

Beginning of Second Mandate as Editors-in-Chief for Helvetica Chimica Acta 开始第二次担任Helvetica china学报总编辑

IF 1.5 4区化学

Helvetica Chimica Acta Pub Date : 2025-02-26 DOI: 10.1002/hlca.202500029

Eva Hevia, Jérôme Waser

引用次数: 0

Thermoresponsive Nanocarriers Transduced by Inorganic Nanoparticles: Design Considerations and Applications in Drug Delivery 由无机纳米颗粒转导的热响应性纳米载体：设计考虑及其在药物传递中的应用

IF 1.5 4区化学

Helvetica Chimica Acta Pub Date : 2025-02-22 DOI: 10.1002/hlca.202400193

Anamarija Nikoletić, Mirela Maleković, Gül Kozalak, Cornelia G. Palivan, Oya Tagit

{"title":"Thermoresponsive Nanocarriers Transduced by Inorganic Nanoparticles: Design Considerations and Applications in Drug Delivery","authors":"Anamarija Nikoletić, Mirela Maleković, Gül Kozalak, Cornelia G. Palivan, Oya Tagit","doi":"10.1002/hlca.202400193","DOIUrl":"https://doi.org/10.1002/hlca.202400193","url":null,"abstract":"Thermoresponsive polymers, which undergo phase transitions within physiologically tolerated temperatures, are key to developing drug delivery systems (DDS) with precise spatial and temporal control, potentially addressing challenges associated with the treatment of complex diseases. Inorganic nanoparticles with unique optical, electronic, and magnetic properties serve as efficient transducers, converting external stimuli into localized heat to trigger thermoresponsive nanocarriers. This review explores the design and application of thermoresponsive nanocarriers transduced by inorganic nanoparticles as DDS. Following a brief description of temperature-triggered phase transition of polymers and heat generation mechanisms by inorganic nanoparticles, strategies to integrate these components into hybrid systems are described. Examples demonstrating the utility of these hybrid systems as advanced DDS are discussed, highlighting their potential for precise drug release alongside theranostic capabilities by combining therapy with imaging. Despite the challenges in design, synthesis, and biological applications, thermoresponsive polymer-inorganic hybrids hold immense promise for transforming drug delivery and biomedical innovations.","PeriodicalId":12842,"journal":{"name":"Helvetica Chimica Acta","volume":"108 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hlca.202400193","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629875","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