ChemPhotoChem最新文献_第10页

Unravelling the Competition between Internal Conversion and Intersystem Crossing in Twisted molecule 9-Phenylacridine by Femtosecond Time-resolved Spectroscopy 通过飞秒时间分辨光谱学揭示 9-苯基吖啶双分子中内部转换和系统间交叉的竞争关系

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-04-26 DOI: 10.1002/cptc.202400108

Ke Hu, Xiaoxiao He, PeiPei Jin, Xueli Wang, Prof. Haifeng Pan, Prof. Jinquan Chen

{"title":"Unravelling the Competition between Internal Conversion and Intersystem Crossing in Twisted molecule 9-Phenylacridine by Femtosecond Time-resolved Spectroscopy","authors":"Ke Hu, Xiaoxiao He, PeiPei Jin, Xueli Wang, Prof. Haifeng Pan, Prof. Jinquan Chen","doi":"10.1002/cptc.202400108","DOIUrl":"10.1002/cptc.202400108","url":null,"abstract":"9-Phenylacridine (9-PA) is an important acridine-based medicine that has been proven to possess significant anticancer activity and can be used as a photodynamic therapy (PDT) agent. Meanwhile, the possible twisting of the C−C single bond at the C9 position after photo-excitation makes it a potential probe responsive to changes in the viscosity of living cells. However, the photophysical properties of 9-PA is poorly understood. In this study, we utilized femtosecond time-resolved spectroscopy combined with quantum chemical calculation methods to investigate the excited state dynamics of 9-PA in solutions with different viscosities. Notably, we demonstrated that the viscosity could strongly influence the deactivation pathway of the initially populated S1 (ππ*) state of 9-PA. In low-viscosity solutions, the single bond at the C9 could twist after photo-excitation, leading to a conformation that shows efficient intersystem crossing. However, such process is suppressed in high-viscosity solutions, resulting a ~2.5 times higher internal conversion (IC) yield. A full picture of the excited state deactivation mechanism of 9-PA is proposed.","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140801225","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

Selective Conversion of Furfural to Furfuryl Alcohol by Heterogeneous TiO2 Photocatalysis 利用异相二氧化钛光催化技术将糠醛选择性转化为糠醇

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-04-25 DOI: 10.1002/cptc.202400062

Joana C. Lopes, Dr. Maria J. Sampaio, Prof. Cláudia G. Silva, Prof. Joaquim L. Faria

{"title":"Selective Conversion of Furfural to Furfuryl Alcohol by Heterogeneous TiO2 Photocatalysis","authors":"Joana C. Lopes, Dr. Maria J. Sampaio, Prof. Cláudia G. Silva, Prof. Joaquim L. Faria","doi":"10.1002/cptc.202400062","DOIUrl":"10.1002/cptc.202400062","url":null,"abstract":"Selective synthesis of furfuryl alcohol from furfural conversion via semiconductor photocatalytic route has appeared as a promising solution for transforming biomass into high-value-added products under mild temperature and pressure conditions. Titanium dioxide (TiO2) photocatalysts were prepared by a simple sol-gel method followed by a calcination treatment ranging from 500–1000 °C, resulting in materials with distinct physicochemical properties. The photocatalytic efficiency of the TiO2 samples was examined in the selective production of furfuryl alcohol from furfural under UV-LED irradiation. The influence of various organic solvents, including ethanol, methanol, 2-propanol, and acetonitrile, was evaluated to optimise the selectivity towards furfuryl alcohol production. Photocatalysts with larger anatase to rutile ratio and increased density of oxygen vacancies (defects) exhibited superior performance for furfuryl alcohol production. The presence of these defects on the catalyst surface leads to a significant enhancement in the photocatalytic efficiency by acting as crucial active sites. Among the TiO2 samples, the highest conversion of furfural into furfuryl alcohol was observed with the TiO2 sample calcined under an air atmosphere at 600 °C (TiO2-600), achieving 85 % yield and 100 % selectivity for furfural after 30 min reaction using ethanol as solvent.","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cptc.202400062","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140658726","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

Methoxylated bis(pentafluorophenyl)boron-β-diketonates: Synthesis, Optical Properties and Hydrolytic Stability 甲氧基化双（五氟苯基）硼-β-二酮：合成、光学特性和水解稳定性

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-04-23 DOI: 10.1002/cptc.202300317

Maxim V. Filippov, Yuriy N. Kononevich, Dmitry S. Ionov, Andrey A. Safonov, Anastasia I. Karnaeva, Viacheslav A. Sazhnikov, Mikhail V. Alfimov, Aziz M. Muzafarov

{"title":"Methoxylated bis(pentafluorophenyl)boron-β-diketonates: Synthesis, Optical Properties and Hydrolytic Stability","authors":"Maxim V. Filippov, Yuriy N. Kononevich, Dmitry S. Ionov, Andrey A. Safonov, Anastasia I. Karnaeva, Viacheslav A. Sazhnikov, Mikhail V. Alfimov, Aziz M. Muzafarov","doi":"10.1002/cptc.202300317","DOIUrl":"10.1002/cptc.202300317","url":null,"abstract":"A series of methoxylated bis(pentafluorophenyl)boron-β-diketonates (dkB(C6F5)2) with intense emission has been synthesized and characterized by a variety of physicochemical methods. The photophysical properties of the synthesized compounds were thoroughly investigated by electronic absorption, steady-state, and time-resolved fluorescence spectroscopy in both solution and solid state. The studied compounds exhibit solvatochromic behavior attributed to the intramolecular charge transfer (ICT) nature of the first excited state. The formation of exciplexes between DBMB(C6F5)2 and benzene derivatives was also studied. Notably, the studied compounds display a complex luminescence profile in the solid state, featuring fluorescence, delayed fluorescence and phosphorescence emission. Furthermore, the hydrolytical stability of the complexes was assessed, demonstrating excellent resistance to hydrolysis. Estimated rate constants, determined at 60 °C, are significantly lower (90-2000 times) than those observed for the well-studied dibenzoylmethanatoboron difluoride (DBMBF2). The incorporation of pentafluorophenyl substituents at the boron atom enables the synthesis of highly fluorescent and hydrolytically stable boron chelate complexes, suitable for sensing and bioimaging applications in water-containing environments.","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140666300","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

Preparation of Light-responsive Unnatural RNA Bases via a Chromogenic Morita-Baylis-Hillman Adduct Path 通过变色莫里塔-贝利斯-希尔曼加成途径制备光反应非天然 RNA 碱基

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-04-23 DOI: 10.1002/cptc.202400093

Dr. Matteo Lami, Dr. Leonardo Barneschi, Dr. Mario Saletti, Prof. Dr. Massimo Olivucci, Prof. Dr. Andrea Cappelli, Prof. Dr. Marco Paolino

{"title":"Preparation of Light-responsive Unnatural RNA Bases via a Chromogenic Morita-Baylis-Hillman Adduct Path","authors":"Dr. Matteo Lami, Dr. Leonardo Barneschi, Dr. Mario Saletti, Prof. Dr. Massimo Olivucci, Prof. Dr. Andrea Cappelli, Prof. Dr. Marco Paolino","doi":"10.1002/cptc.202400093","DOIUrl":"10.1002/cptc.202400093","url":null,"abstract":"RNA-based tools for biological and pharmacological research are raising an increasing interest. Among these, RNA aptamers whose biological activity can be controlled via illumination with specific wavelengths represent an important target. Here, we report on a proof-of-principle study supporting the viability of a systematic use of Morita-Baylis-Hillman adducts (MBHAs) for the synthesis of light-responsive RNA building blocks. Accordingly, a specific acetylated MBHA derivative was employed in the functionalization of the four natural RNA bases as well as two unnatural bases (5-aminomethyl uracil and 5-methylaminomethyl uracil). The results reveal a highly selective functionalization for both unnatural bases. The conjugation products were then investigated spectroscopically, photochemically and computationally. It is shown that when a single light-responsive unit is present (i. e. when using 5-methylaminomethyl uracil), the generated unnatural uracil behaves like a cinnamic-framework-based photochemical switch that isomerizes upon illumination through a biomimetic light-induced intramolecular charge transfer mechanism driving a barrierless and, therefore, ultrafast reaction path.","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140666352","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 Inert is Single-Stranded DNA Towards DNA-Stabilized Silver Nanoclusters? A Case Study 单链 DNA 对 DNA 稳定的纳米银团簇的惰性如何？案例研究。

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-04-22 DOI: 10.1002/cptc.202400014

Vanessa Rück, Cecilia Cerretani, Tom Vosch

{"title":"How Inert is Single-Stranded DNA Towards DNA-Stabilized Silver Nanoclusters? A Case Study","authors":"Vanessa Rück, Cecilia Cerretani, Tom Vosch","doi":"10.1002/cptc.202400014","DOIUrl":"10.1002/cptc.202400014","url":null,"abstract":"A case study, detailing the effect of different DNA oligomers on a NIR-emitting DNA-stabilized silver nanocluster (DNA-AgNC), is reported. The presence of single-stranded DNA oligomers was found to adversely affect the chemical stability of (DNA)2[Ag16Cl2]8+ with distinct degrees of destruction depending on the DNA sequence. To increase the chemical stability of the DNA-AgNC, we implemented two protection strategies. First, hybridization of the bare DNA strands with the corresponding complementary sequences dramatically reduced the destruction of (DNA)2[Ag16Cl2]8+, as demonstrated by the decreased drops in both the absorption and emission spectra. Secondly, saturation of the free DNA oligomers with silver cations left (DNA)2[Ag16Cl2]8+ intact. Our investigation can thus provide an easy-to-implement approach to discover DNA sequences that are intrinsically less reactive towards preformed DNA-AgNCs, and give an idea on how to protect DNA-AgNCs from bare DNA strands.","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cptc.202400014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140677541","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

Impact of Surrounding Environment on Hot-Exciton Based Organic Emitters for TADF Applications 周围环境对基于热激子的 TADF 应用有机发射器的影响

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-04-18 DOI: 10.1002/cptc.202400073

Jesni M. Jacob, Dr. Mahesh Kumar Ravva

{"title":"Impact of Surrounding Environment on Hot-Exciton Based Organic Emitters for TADF Applications","authors":"Jesni M. Jacob, Dr. Mahesh Kumar Ravva","doi":"10.1002/cptc.202400073","DOIUrl":"10.1002/cptc.202400073","url":null,"abstract":"Understanding thermally activated delayed fluorescence (TADF) in solid-state environments is crucial for practical applications. However, limited research focuses on how the medium affects TADF properties of hot-exciton-based emitters. In our study, we calculated and compared reverse intersystem crossing, radiative, and non-radiative decay rates of TADF emitters in gas, solvent, and solid phases. The designed emitters have a donor-acceptor-donor (D-A-D) structure, with donors such as triphenylamine (TPA) and diphenylamine thiophene (ThPA), combined with acceptors such as benzothiadiazole (BT), pyridine thiadiazole (PT) and thiadiazolobenzopyridine (NPT). We model the solvent and solid phases with the polarizable continuum model (PCM) and quantum mechanical/molecular mechanics (QM/MM) methods, respectively. Using density functional theory (DFT) and time-dependent DFT, we analyze how TADF emitters′ geometrical, electronic, and excited-state properties vary in these phases. Our results show that the solid-state environment significantly influences the geometry and TADF properties of emitters. In the presence of solid medium, our study indicates that non-radiative decay rates tend to be slower. On the other hand, radiative emission rates were found to be less influenced by the properties of the surrounding medium. Overall, our study connects emitter chemical structure and the surrounding environment‘s impact on excited-state characteristics and photochemical properties.","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140628382","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

Synthesis and Photoreforming Reaction of CdS Prepared from MOF Precursor 用 MOF 前驱体制备 CdS 的合成与光形成反应

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-04-18 DOI: 10.1002/cptc.202400018

Sora Kamata, Dr. Haruki Nagakawa, Ayako Inaguma, Dr. Morio Nagata

引用次数: 0

Ultrafast Spectroelectrochemistry of the Catechol/o-Quinone Redox Couple in Aqueous Buffer Solution 水性缓冲溶液中儿茶酚/邻醌氧化还原偶的超快光谱电化学研究

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-04-18 DOI: 10.1002/cptc.202300325

Sofia Goia, Gareth W. Richings, Matthew A. P. Turner, Jack M. Woolley, Joshua J. Tully, Samuel J. Cobb, Adam Burriss, Ben R. Robinson, Julie V. Macpherson, Vasilios G. Stavros

{"title":"Ultrafast Spectroelectrochemistry of the Catechol/o-Quinone Redox Couple in Aqueous Buffer Solution","authors":"Sofia Goia, Gareth W. Richings, Matthew A. P. Turner, Jack M. Woolley, Joshua J. Tully, Samuel J. Cobb, Adam Burriss, Ben R. Robinson, Julie V. Macpherson, Vasilios G. Stavros","doi":"10.1002/cptc.202300325","DOIUrl":"10.1002/cptc.202300325","url":null,"abstract":"Eumelanin is a natural pigment found in many organisms that provides photoprotection from harmful UV radiation. As a redox-active biopolymer, the structure of eumelanin is thought to contain different redox states of quinone, including catechol subunits. To further explore the excited state properties of eumelanin, we have investigated the catechol/o-quinone redox couple by spectroelectrochemical means, in a pH 7.4 aqueous buffered solution, and using a boron doped diamond mesh electrode. At pH 7.4, the two proton, two electron oxidation of catechol is promoted, which facilitates continuous formation of the unstable o-quinone product in solution. Ultrafast transient absorption (femtosecond to nanosecond) measurements of o-quinone species involve initial formation of an excited singlet state followed by triplet state formation within 24 ps. In contrast, catechol in aqueous buffer leads to formation of the semiquinone radical Δt>500 ps. Our results demonstrate the rich photochemistry of the catechol/o-quinone redox couple and provides further insight into the excited state processes of these key building blocks of eumelanin.","PeriodicalId":10108,"journal":{"name":"ChemPhotoChem","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cptc.202300325","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140628945","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

Front Cover: A Guide to Chemical Reactions Design in Carbon Nitride Photocatalysis (ChemPhotoChem 4/2024) 封面：氮化碳光催化化学反应设计指南》（ChemPhotoChem 4/2024）

IF 3.7 4区化学

ChemPhotoChem Pub Date : 2024-04-17 DOI: 10.1002/cptc.202400095

Prof. Oleksandr Savateev, Jingru Zhuang

引用次数: 0

Effect of Microhydration in Tuning the Photophysical Behavior of a Luminescent DNA Probe Revealed by Non-Adiabatic Dynamics 非绝热动力学揭示的微水化对调节发光 DNA 探针光物理行为的影响

IF 3 4区化学

ChemPhotoChem Pub Date : 2024-04-17 DOI: 10.1002/cptc.202400078

Dr. Elise Lognon, Prof. Dr. Alain Burger, Prof. Dr. Elise Dumont, Prof. Dr. Antonio Monari

引用次数: 0