ChemPhotoChem最新文献_第4页

Charge State Tuning and Photochemical Stability of Au25(SR)18 Nanoclusters Au25(SR)18纳米团簇的电荷态调谐和光化学稳定性

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-12-10 DOI: 10.1002/cptc.202400236

Johanna A. de Jong, Mark S. Workentin, Mahdi Hesari

{"title":"Charge State Tuning and Photochemical Stability of Au25(SR)18 Nanoclusters","authors":"Johanna A. de Jong, Mark S. Workentin, Mahdi Hesari","doi":"10.1002/cptc.202400236","DOIUrl":"https://doi.org/10.1002/cptc.202400236","url":null,"abstract":"The photolysis of the gold nanoclusters Au25(SR)18z (R=C2H4Ph and C12H25, z=1−, 0 and 1+) NCs in halogenated solvents such as dichloromethane leads to changes in the charged states of the Au25(SR)18z observed using UV-Visible and 1H NMR spectroscopic techniques. Matrix-assisted laser desorption/ionization mass spectrometry results proved that during charge transformation from anion to neutral and eventually cation forms, the size of nanoclusters remains intact. Electrochemistry of Au25(SR)18 has enabled the monitoring of these changes by cyclic voltammetry, indicating decay in the redox peak current upon irradiation. In the absence of light and/or in a non-halogenated solvent, e. g., tetrahydrofuran, no substantial change in the photophysical signatures of Au25 nanoclusters was observed. These observations highlight the importance of selecting appropriate solvent(s) in the synthesis and photochemical studies of atomically precise metal nanoclusters and the possibility of using photochemistry in halogenated solvents to synthesize different charge states of atomically precise metal nanoclusters. Thus, other monodispersed molecule-like nanoclusters, with various sizes and charges, can be achieved via this photosynthetic protocol under controlled conditions, e. g., solvent, light, and photolysis duration.","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"9 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594909","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

Front Cover: Fluorene vs. Spirobifluorene: Effect of the π-System on TADF Properties (ChemPhotoChem 12/2024) 封面：芴与螺比芴：π-体系对TADF性能的影响（ChemPhotoChem 12/2024）

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-12-10 DOI: 10.1002/cptc.202481201

Tim Silies, Nikos L. Doltsinis, Constantin G. Daniliuc, Fabio Rizzo

引用次数: 0

Distinct Mechanisms of Triplet Pair Decay in Amorphous and Crystalline Heteroacene Thin Films 非晶和晶体异质薄膜中三重态对衰变的不同机制

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-12-04 DOI: 10.1002/cptc.202400224

Brandon K. Rugg, Angana De, Sarath Santhakumar, Qiushi Ma, Brian Fluegel, Karl J. Thorley, John E. Anthony, Libai Huang, Justin C. Johnson

{"title":"Distinct Mechanisms of Triplet Pair Decay in Amorphous and Crystalline Heteroacene Thin Films","authors":"Brandon K. Rugg, Angana De, Sarath Santhakumar, Qiushi Ma, Brian Fluegel, Karl J. Thorley, John E. Anthony, Libai Huang, Justin C. Johnson","doi":"10.1002/cptc.202400224","DOIUrl":"https://doi.org/10.1002/cptc.202400224","url":null,"abstract":"Triplet pairs (TT) in crystalline molecular semiconductors have unique spin properties of interest for quantum information or enhancing solar photoconversion. The population and diffusion dynamics of TT have been the subject of recent studies, both in covalent dimers and in crystalline systems. Here, we monitor the triplet population in neat polycrystalline and amorphous films of a heteroacene with known TT spectral properties and tunable spin polarization depending on the intermolecular geometry. Transient measurements reveal an anomalous power dependence in polycrystalline films that we attribute to the fast diffusion and interaction of dissociated triplet pairs confined to one-dimensional stacks of strongly coupled molecules. The nongeminate triplet interaction after dephasing facilitates conversion to the triplet 3TT and eventually T1+S0. Amorphous films have no power dependence and proceed directly from 1TT to 3TT and subsequently T1+S0 via state mixing facilitated by nonparallel geometries and weak exchange coupling.","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"9 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143595199","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

Computational Study on the Photo-Induced Antibiotic Activity of an Azoquinolone with Promising Applications in Photopharmacology 一种具有光药理学应用前景的氮喹诺酮类药物光致抗生素活性的计算研究

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-11-24 DOI: 10.1002/cptc.202400280

Pedro J. Castro, Orlando D. Mendinueta, Mary H. Mays, Fernando Castro-Gómez

{"title":"Computational Study on the Photo-Induced Antibiotic Activity of an Azoquinolone with Promising Applications in Photopharmacology","authors":"Pedro J. Castro, Orlando D. Mendinueta, Mary H. Mays, Fernando Castro-Gómez","doi":"10.1002/cptc.202400280","DOIUrl":"https://doi.org/10.1002/cptc.202400280","url":null,"abstract":"Azocompounds are among the most important group of molecular photoswitches due to their multiple applications in various scientific areas. We studied the thermal and photochemical reactions of an azocompound with photo-induced antibiotic properties using ab-initio calculations based on Kohn-Shan, Spin-Flip and time-dependent Density Functional Theory. Our primary goal is to understand the absorption spectra and isomerization pathways governing the molecule's light-controlled antibiotic activity. The nuclear ensemble approach was used for the most stable trans and cis isomers, and the absorption spectra were calculated and fitted to predict the cis/trans isomer ratios in the carboxylate form, using experimental measurements as a reference. We stablished that rotation is involved in the most favorable cis↔cis and trans↔trans thermal isomerization pathways, while the inversion mechanism is the most likely for cis↔trans isomerizations. We found that the photochemical trans→cis isomerization follows a consistent mechanism across all trans isomers, involving excitation to S2(ππ*), an in-plane ultrafast internal conversion to S1(nπ*), followed by rotation of the azo bond up to a twisted S1(nπ*)/S0 conical intersection. We used a custom approach to evaluate the most favorable decay pathway from the S1(nπ*)/S0 conical intersections to trans and cis photoproducts using static calculations.","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"9 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cptc.202400280","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143595451","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

Metal-organic Framework-derived NiO/ZnO Composites for Photoelectrocatalytic Reduction of Cr(VI) 金属-有机骨架衍生NiO/ZnO复合材料的光电催化还原Cr（VI）

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-11-24 DOI: 10.1002/cptc.202400091

Huayu Zhang, Jiejie Nan, Xiaoting Ning, Lianjiang Hu, Qian Shao, Jing Zhang, Zeinhom M. El-Bahy, Hua Qiu, Mohamed M. Ibrahim, Gaber A. M. Mersal, Ruixiang Ge, Zhanhu Guo

{"title":"Metal-organic Framework-derived NiO/ZnO Composites for Photoelectrocatalytic Reduction of Cr(VI)","authors":"Huayu Zhang, Jiejie Nan, Xiaoting Ning, Lianjiang Hu, Qian Shao, Jing Zhang, Zeinhom M. El-Bahy, Hua Qiu, Mohamed M. Ibrahim, Gaber A. M. Mersal, Ruixiang Ge, Zhanhu Guo","doi":"10.1002/cptc.202400091","DOIUrl":"https://doi.org/10.1002/cptc.202400091","url":null,"abstract":"Ni/Zn-MOF composites with photoelectrocatalytic (PEC) performance for Cr(VI) reduction were prepared via hydrothermal method and calcinating method. The as-prepared NiO/ZnO composites exhibited uniform morphology. When being subjected to an external voltage of 0.7 V and irradiated with visible light for 120 min, the NiO/ZnO composite exhibited a Cr (VI) reduction efficiency of almost 100 %, outperforming ZnO and NiO counterparts. The effects of the content of NiO to ZnO and different calcination temperatures on PEC performance were also investigated. Additionally, elimination experiments results indicated that photo-generated electrons (e−) play a crucial role in the catalytic reduction of Cr(VI). The notable enhancement in the photoelectrocatalytic performance can be credited to the applied bias voltage and the formation of a p-n heterojunction between NiO and ZnO. Consequently, the NiO/ZnO nanocomposites exhibit significant potential for the PEC reduction of Cr(VI). This capability underscores the promise of NiO/ZnO nanocomposites for applications in the photoelectrocatalytic reduction of Cr(VI) and related environmental remediation processes.","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"9 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cptc.202400091","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143595450","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

Hemiindigoids as Prominent Photoswitch Scaffolds 半靛蓝作为突出的光开关支架

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-11-22 DOI: 10.1002/cptc.202400261

Aurélie Gernet, Loïc Toursel, Louise-Marie Balivet, Lucas Pagès, Ludovic Jean

引用次数: 0

The Fluorescent Amyloid Ligand X34 Binding to Transthyretin (TTR) Tetramer and Fibrils: FRET and Binding Constants of a Sequential Two-step Process 荧光淀粉样配体X34与转甲状腺素（TTR）四聚体和原纤维的结合：连续两步过程的FRET和结合常数

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-11-20 DOI: 10.1002/cptc.202400249

Marikken Sundnes, Priyanka Swaminathan, Mikael Lindgren, Ganesh Mohite, Ebba Hellstrand, Sofie Nyström, Per Hammarström

{"title":"The Fluorescent Amyloid Ligand X34 Binding to Transthyretin (TTR) Tetramer and Fibrils: FRET and Binding Constants of a Sequential Two-step Process","authors":"Marikken Sundnes, Priyanka Swaminathan, Mikael Lindgren, Ganesh Mohite, Ebba Hellstrand, Sofie Nyström, Per Hammarström","doi":"10.1002/cptc.202400249","DOIUrl":"https://doi.org/10.1002/cptc.202400249","url":null,"abstract":"The amyloidogenic homotetrameric plasma protein transthyretin (TTR) has an affinity for bicyclic small molecule ligands in its two thyroxine (T4) binding sites. We have shown that native tetrameric TTR binds to amyloid ligands based on the trans-stilbene scaffold. The fluorescent Congo-red analogue, X34, is a symmetric bi-trans-stilbene that contains two salicylic acid motifs. We used fluorescence spectroscopy methods to interrogate X34 binding to the TTR tetramer and fibril. We discovered two binding sites in both TTR forms by tryptophan FRET, ligand self-quenching, Stern-Volmer plots and binding curves, for the latter including the competitive ligand diflunisal. X34 binds with the similar affinity as diflunisal in the first binding site (Kd1=150 nM), and negative cooperativity renders the binding to the second site with lower affinity very similar compared to diflunisal (Kd2= 1.1 μM). This behavior is coherent with the salicylic acid moiety of diflunisal binding into the binding pocket of TTR (reverse mode). Interestingly X34 binding to TTR fibrils was also well fitted to two binding sites, however with overall lower affinity (Kd1=1.2 μM; Kd2=2.1 μM) compared to binding to the native tetramer. X34 fluorescence when bound to TTR-fibrils was significantly blue shifted compared to binding to the TTR-tetramer.","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":"9 2","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cptc.202400249","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380949","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

Two-Photon Absorption Switches Based on Protonation of Pyrimidine Derivatives 基于嘧啶衍生物质子化的双光子吸收开关

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-11-20 DOI: 10.1002/cptc.202400278

Lampros Sdralias, Alexandros Katsidas, Ioannis Polyzos, Thibault Bonnaud, Guillaume Noirbent, Sylvain Achelle, Mihalis Fakis

引用次数: 0

Thermodynamic Fluorescence Behavior of a Fluorenone Derivative through Solvent- and Temperature-Controlled Hydrogen Bonding 氟芴酮衍生物通过溶剂和温度控制氢键的热力学荧光行为

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-11-20 DOI: 10.1002/cptc.202400314

Mr. Jineun Lee, Prof. Toshikazu Sakaguchi, Prof. Giseop Kwak

引用次数: 0

The Combination of Graphitic Carbon Nitride (gC3N4) and Supercritical Carbon Dioxide for Green Photooxidation of Benzylic Alcohols 石墨氮化碳（gC3N4）与超临界二氧化碳的结合用于苯基醇的绿色光氧化