Dalton Transactions最新文献

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A ‘turn-on’ iridium(III) complex probe for visualizing mitochondrial SO2 fluctuation in cancer cells and tumor models 一种用于可视化癌细胞和肿瘤模型中线粒体SO2波动的“开启”铱(III)复合物探针
IF 4 3区 化学
Dalton Transactions Pub Date : 2025-10-01 DOI: 10.1039/d5dt01854d
Si-Yu Chen, Meng-Sen Chen, An-Li Liu, Gao-Nan Li, Fabiao Yu, Zhi-Gang Niu
{"title":"A ‘turn-on’ iridium(III) complex probe for visualizing mitochondrial SO2 fluctuation in cancer cells and tumor models","authors":"Si-Yu Chen, Meng-Sen Chen, An-Li Liu, Gao-Nan Li, Fabiao Yu, Zhi-Gang Niu","doi":"10.1039/d5dt01854d","DOIUrl":"https://doi.org/10.1039/d5dt01854d","url":null,"abstract":"Mitochondrial sulfur dioxide (SO2) plays critical biological roles in physiological processes. Notably, abnormal endogenous SO2 levels serve as potential biomarkers for early diagnosis of tumors. Therefore, visual detection of SO2 in cancer cells and tumor models is a subject of significant interest. A ‘turn-on’ iridium(III) complex probe (Ir-CHO) was designed and synthsized, utilizing 2-phenylpyridine (ppy) as the main ligand and 2-(pyridin-2-yl)imidazo[1,2-a]pyridine-3-carbaldehyde (PIP-CHO) as the ancillary ligand, for identifying SO2 in living Hela cells and tumors through bioimaging. The probe exhibits some outstanding properties, including high phosphorescence quantum yield (31.1%), microsecond lifetime (0.61 µs), relatively low detection limit (0.68 μM), rapid response (<1 min), excellent photostability (>60 min), high selectivity and specificity, low cytotoxicity, and mitochondria-targeted ability (PCC=0.805). Based on these properties, the probe was successfully applied to visualize endogenous and exogenous SO2 in living cells and effectively distinguish normal mice and tumor mice with negligible systemic toxicity. All the results suggest that this new probe Ir-CHO could monitor SO2 derivatives in real-time within tumor microenvironment research, highlighting its promising diagnostic potential for future clinical and biomedical applications.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"6 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145195502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
An acetate bridged centrosymmetric trinuclear Zn(II) cluster: structural insights, biomolecular interactions, sensing and cytotoxic activity. 醋酸桥接中心对称三核Zn(II)簇:结构见解、生物分子相互作用、传感和细胞毒性活性。
IF 4 3区 化学
Dalton Transactions Pub Date : 2025-10-01 DOI: 10.1039/d5dt02057c
Imtiyaz Ahmad Mantoo,Masrat Bashir,Mushtaq Ahmad Nengroo,Shahnawaz Ali Bhat,Imtiyaz Yousuf
{"title":"An acetate bridged centrosymmetric trinuclear Zn(II) cluster: structural insights, biomolecular interactions, sensing and cytotoxic activity.","authors":"Imtiyaz Ahmad Mantoo,Masrat Bashir,Mushtaq Ahmad Nengroo,Shahnawaz Ali Bhat,Imtiyaz Yousuf","doi":"10.1039/d5dt02057c","DOIUrl":"https://doi.org/10.1039/d5dt02057c","url":null,"abstract":"A multifunctional trinuclear zinc cluster with the formula [Zn3L2(μ1,2-OAc)2(μ1,1,2-OAc)2] (C1) was synthesized from a tridentate Schiff base ligand (L1) and thoroughly characterized by various spectral (FTIR, 1H & 13CNMR, UV-vis, and sc-XRD studies) and analytical techniques. The sc-XRD studies of C1 revealed a monoclinic crystal system with a space group of P21/c, wherein three zinc (Zn3) centers are bridged via four acetate ions. The DFT and TDDFT studies were also performed to validate the chemical and electronic structures of the Zn(II) cluster. The HOMO electron density is mainly restricted on the bridging acetate ions and the ligand moiety while the LUMO electron density is distributed throughout the metal complex. We exploited the sensing activity of the Zn(II) cluster using spectral techniques which validated a selective and efficient sensing of Al3+ ions in aqueous medium. Moreover, the catecholase activity of C1 was evaluated and interestingly, our results indicated a ligand-centered radical pathway with a remarkable catalytic activity. We further carried out in vitro biomolecular interactions with ct-DNA using multispectral methods to authenticate the chemotherapeutic potential of C1. Furthermore, the cytotoxicity of C1 was evaluated against HCT116 (colon cancer), MDA-MB-231 (triple-negative breast cancer) and SH-SY5Y (neuroblastoma) cancer cells and toxicity studies were carried out against the normal VERO (kidney) cell line which revealed selective cytotoxicity of C1 against the MDA-MB-231 cancer cells with a remarkably low IC50 value.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"53 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145194915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Stability, Structure, Dynamics and Thermal Properties of C-type Aluminiumtrisdihydrogenphosphate c型磷酸二氢铝的稳定性、结构、动力学和热性能
IF 4 3区 化学
Dalton Transactions Pub Date : 2025-10-01 DOI: 10.1039/d5dt02141c
Sheyi Clement Adediwura, Jan Konrad Wied, Christian Franz Litterscheid, Jörn Schmedt auf der Günne
{"title":"Stability, Structure, Dynamics and Thermal Properties of C-type Aluminiumtrisdihydrogenphosphate","authors":"Sheyi Clement Adediwura, Jan Konrad Wied, Christian Franz Litterscheid, Jörn Schmedt auf der Günne","doi":"10.1039/d5dt02141c","DOIUrl":"https://doi.org/10.1039/d5dt02141c","url":null,"abstract":"Among the fastest hydrogen ion conductors are various hydrogen-rich phosphates, such as phosphoric acid and CsH<small><sub>2</sub></small>PO<small><sub>4</sub></small> . This in principle makes Al(H<small><sub>2</sub></small>PO<small><sub>4</sub></small>)<small><sub>3</sub></small> a promising candidate for proton conduction within its hydrogen bonding network, especially in the medium-temperature range. Here, the phase-pure synthesis and structural details of the ferroelectric crystal C-type Al(H<small><sub>2</sub></small>PO<small><sub>4</sub></small>)<small><sub>3</sub></small> are reported, where density functional theory (DFT) calculations were used to study the thermodynamic stability of different Al(H<small><sub>2</sub></small>PO<small><sub>4</sub></small>)<small><sub>3</sub></small>polymorphs. Its ion conductivity as determined by impedance spectroscopy is an order of magnitude higher than previously reported. The thermal stability and the decomposition route of Al(H<small><sub>2</sub></small>PO<small><sub>4</sub></small>)<small><sub>3</sub></small> were studied using XRD, thermal analysis, and solid-state NMR, yielding results different from those previously observed in various mixtures containing Al(H<small><sub>2</sub></small>PO<small><sub>4</sub></small>)<small><sub>3</sub></small>. Heating produces an amorphous intermediate phase which converts into phase-pure monoclinic Al<small><sub>2</sub></small>(P<small><sub>6</sub></small>O<small><sub>18</sub></small>), which at even higher temperatures converts into the cubic phase Al<small><sub>4</sub></small>(P<small><sub>4</sub></small>O<small><sub>12</sub></small>)<small><sub>3</sub></small> and little AlPO<small><sub>4</sub></small> . Rietveld refinements of C-type Al(H<small><sub>2</sub></small>PO<small><sub>4</sub></small>)<small><sub>3</sub></small> and Al<small><sub>4</sub></small>(P<small><sub>4</sub></small>O<small><sub>12</sub></small>)<small><sub>3</sub></small> are provided. The results show that while the proton ion conductivity of C-type Al(H<small><sub>2</sub></small>PO<small><sub>4</sub></small>)<small><sub>3</sub></small> is hampered by the strong hydrogen-bonds, the structure features a Curie temperature significantly higher than room-temperature.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"72 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145195394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Enhancement in the performance of Nb14W3O44 high power anodes through P doping in the tetrahedral sites 在四面体中掺杂P对Nb14W3O44高功率阳极性能的提高
IF 4 3区 化学
Dalton Transactions Pub Date : 2025-10-01 DOI: 10.1039/d5dt02060c
Alex James Green, James W Annis, Dominic John Gardner, Aron Spiller, Phoebe K Allan, Peter R. Slater
{"title":"Enhancement in the performance of Nb14W3O44 high power anodes through P doping in the tetrahedral sites","authors":"Alex James Green, James W Annis, Dominic John Gardner, Aron Spiller, Phoebe K Allan, Peter R. Slater","doi":"10.1039/d5dt02060c","DOIUrl":"https://doi.org/10.1039/d5dt02060c","url":null,"abstract":"Niobium-based anodes are emerging as promising candidates for high-power lithium-ion batteries due to their high theoretical capacities, robust safety at high current densities, and excellent long-term cycling stability. In this respect Nb14W3O44 (NWO) has been attracting significant interest, and in this work, we investigate for the first time phosphorous-doping into this phase. Structural characterisation confirmed the substitution of phosphorous into the tetrahedral sites of the NWO framework, with a resulting contraction in the unit cell dimensions. Electrochemical testing demonstrated superior capacities for the P-doped materials, attributed to the replacement of W in the tetrahedral sites by non-reducible P, with a corresponding increase in W content in the octahedral sites. The P doped samples also showed excellent rate capability, with x = 0.5 and x = 1 retaining high capacities of 180(5) and 190(10) mA h g-1 at 2 A g-1, respectively and 163(15) and 166(12) mA h g-1 at 4 A g-1 respectively, which could be additionally related to the P doping reducing particle size, which shortens lithium-ion diffusion paths. These results suggest further studies are warranted on the effect of such site-selective doping on the structure and morphology control, and the resulting influence on the electrochemical properties, in other Wadsley Roth niobate anodes with tetrahedral sites.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"99 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145195395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Constructing Ru doped Fe/nickel foam with efficient oxygen evolution reaction using a simple one-step electrodeposition technique 用简单的一步电沉积技术制备Ru掺杂Fe/镍泡沫的高效析氧反应
IF 4 3区 化学
Dalton Transactions Pub Date : 2025-10-01 DOI: 10.1039/d5dt02126j
Ruiling Hu, Lingping Jiang, Yaxin Wang, Min Zhao, Congrong Wang, Miao Zhang, Lei Yang, Wanbing Gong, Jianguo Lv
{"title":"Constructing Ru doped Fe/nickel foam with efficient oxygen evolution reaction using a simple one-step electrodeposition technique","authors":"Ruiling Hu, Lingping Jiang, Yaxin Wang, Min Zhao, Congrong Wang, Miao Zhang, Lei Yang, Wanbing Gong, Jianguo Lv","doi":"10.1039/d5dt02126j","DOIUrl":"https://doi.org/10.1039/d5dt02126j","url":null,"abstract":"Developing OER electrocatalyst with high efficiency and long-term stability using a simple method is of great significance for water splitting. However, the lack of easily accessible active sites and the degradation of durability caused by reconstruction during the reaction process remain challenges. Herein, we successfully prepared Ru doped Fe on nickel foam (NF) using a facile electrodeposition method. Benefiting from the synergistic effect of porous structure and more accessible active sites, Ru-0.01-Fe/NF-2.5 posses the small OER overpotential of 134 and 168 mV at current densities of 10 and 100 mA cm-2, respectively. More significantly, the electrolytic cell assembled with Ru-0.01-Fe/NF-2.5 and Pt/C as anodes and cathodes for overall water splitting only requires a low voltage of 1.46 V to achieve the current density of 10 mA cm-2. In addition, the electrolytic cell maintained robust stability even after continuous operation of 48 hours at a high current density of approximately 100 mA cm-2. This work may open an avenue to construct OER effective electrocatalyst via facile method, and promote their applications in industrial water electrolysis.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"11 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145195503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Using a sequential synthesis approach to fabricate (Ni,Co)Se2 electrodes for high-performance supercapacitors 采用顺序合成方法制备高性能超级电容器用(Ni,Co)Se2电极
IF 4 3区 化学
Dalton Transactions Pub Date : 2025-09-30 DOI: 10.1039/d5dt01607j
Yi Wang, Sicong Zhang, Qingfeng Zhan, Jingce Bi, Ningning Liu, Xia Zhang, Zhuopeng Wang, Yide Han
{"title":"Using a sequential synthesis approach to fabricate (Ni,Co)Se2 electrodes for high-performance supercapacitors","authors":"Yi Wang, Sicong Zhang, Qingfeng Zhan, Jingce Bi, Ningning Liu, Xia Zhang, Zhuopeng Wang, Yide Han","doi":"10.1039/d5dt01607j","DOIUrl":"https://doi.org/10.1039/d5dt01607j","url":null,"abstract":"The synthesis of bimetallic selenides, derived from bimetallic oxide precursors, has garnered considerable attention for their potential in supercapacitor applications. However, the challenge of promoting their selenization degree from bimetallic oxide precursors to optimize electrochemical performance remains a significant hurdle. In this work, (Ni,Co)Se<small><sub>2</sub></small> electrode materials with a rose-petal-like morphology have been fabricated through a sequential synthesis method from a NiCo-LDH precursor and their supercapacitive performance has been systematically evaluated. The results show that the as-synthesized (Ni,Co)Se<small><sub>2</sub></small> delivers a specific capacitance of 1565 F g<small><sup>−1</sup></small> at 1 A g<small><sup>−1</sup></small>, which is better than those of other nickel–cobalt bimetallic selenides. Additionally, the as-synthesized (Ni,Co)Se<small><sub>2</sub></small> exhibits excellent rate capability, retaining 97.7% capacitance at 10 A g<small><sup>−1</sup></small>. Additionally, at a current density of 20 A g<small><sup>−1</sup></small>, (Ni,Co)Se<small><sub>2</sub></small> retained 87.8% of its capacity after 5000 cycles. Furthermore, the supercapacitor constructed from (Ni,Co)Se<small><sub>2</sub></small> and activated carbon exhibits a remarkable energy density of 44.44 Wh kg<small><sup>−1</sup></small> at a power density of 867.78 W kg<small><sup>–1</sup></small>. This superior electrochemical performance benefits from the sequential synthesis strategy that not only significantly enhances the product's selenization degree, thereby boosting its electrochemical properties, but also maintains the inherent rose-petal-like morphology, ensuring optimal mass transport efficiency. Furthermore, a possible explanation for the improvement of the selenization degree is also proposed.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"94 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145189117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Coordinatively unsaturated mononuclear europium (III) complex: a luminescent sensor for adenosine monophosphate in aqueous media 配位不饱和单核铕(III)配合物:水介质中一磷酸腺苷的发光传感器
IF 4 3区 化学
Dalton Transactions Pub Date : 2025-09-30 DOI: 10.1039/d5dt01849h
Tithi Maity, Raju Biswas, Manik Das, Toushique Ahmed, Soumik Laha, Rosa Maria Gomila, Antonio Frontera, Bidhan Chandra Samanta, Goutam Pramanik
{"title":"Coordinatively unsaturated mononuclear europium (III) complex: a luminescent sensor for adenosine monophosphate in aqueous media","authors":"Tithi Maity, Raju Biswas, Manik Das, Toushique Ahmed, Soumik Laha, Rosa Maria Gomila, Antonio Frontera, Bidhan Chandra Samanta, Goutam Pramanik","doi":"10.1039/d5dt01849h","DOIUrl":"https://doi.org/10.1039/d5dt01849h","url":null,"abstract":"Luminescent probes for sensing adenosine monophosphate (AMP), particularly in the presence of ADP and ATP, are rare. Herein, we report a novel Eu(III) complex, [(H2O)(L)2Eu(SO3CF3)2](SO3CF3) (EuC), for this purpose, which is synthesized through the reaction of a urea and acyl hydrazone-based ligand L and Eu(III) triflate salt. Thorough characterizations, including single-crystal X-ray diffraction analysis, reveal the coordinatively unsaturated structure of EuC. By taking advantage of this unsaturation, the said EuC complex can sense AMP in aqueous medium with a commendable LOD value of 0.412 μM, even in the presence of other anions, including several competitive phosphate anions. Only in the presence of AMP, the characteristic Eu(III)-centered emission peaks for the 5D0→7FJ (J=0-4) transitions, obtained upon irradiating the ligand center, are found to be significantly intensified, which further leads to the enhancement in the relative quantum yield as well as Eu(III)-centered lifetime value. Attempts are also made to shed light on the plausible mechanism of the AMP-sensing efficacy of EuC. The UV-vis absorption and fluorescence titration results suggest a probe-analyte adduct formation between EuC and AMP. The formation of such an adduct is further validated by 31P and 19F NMR spectroscopy, as well as DFT calculations (RI-BP86-D4/desf-TZVP level of theory). Interestingly, the existence of some non-covalent interactions between the ligand and the adenine base of AMP is found to be instrumental in the selective sensing mechanism by the said EuC complex, which is quite unprecedented in the literature.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"23 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145189112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
A Digermylene (LGeI -GeIL) on a N-Heterocyclic Carbene-Fluorenyl Hybrid Ligand (L) and its Oxidation by TEMPO and Ph2E2 (E = S, Se) n -杂环羰基-芴基杂化配体(L)上的二二甲苯(LGeI -GeIL)及其在TEMPO和Ph2E2 (E = S, Se)中的氧化作用
IF 4 3区 化学
Dalton Transactions Pub Date : 2025-09-30 DOI: 10.1039/d5dt02074c
Sumana Mondal, Subham Sarkar, Chhotan Mandal, Dibyendu Mallick, Debabrata Mukherjee
{"title":"A Digermylene (LGeI -GeIL) on a N-Heterocyclic Carbene-Fluorenyl Hybrid Ligand (L) and its Oxidation by TEMPO and Ph2E2 (E = S, Se)","authors":"Sumana Mondal, Subham Sarkar, Chhotan Mandal, Dibyendu Mallick, Debabrata Mukherjee","doi":"10.1039/d5dt02074c","DOIUrl":"https://doi.org/10.1039/d5dt02074c","url":null,"abstract":"A hybrid N-heterocyclic carbene (NHC)-fluorenyl ligand (L) supported GeIICl complex ([LGeCl]; 1) is made from GeCl2(dioxane) and [LK]n. 1 is reduced by Jones’ MgI2 dimer [(MesNacnacMg)2] (MesNacnac = [{(Mes)NCMe}2CH]─; Mes = 2,4,6-Me3-C6H2) to give the digermylene [LGeI-GeIL] (2) with a gauche-bent conformation. 2 is oxidized by TEMPO (2,2,6,6-tetramethylpiperidinyloxy) and Ph2E2 (E = S, Se) to give [LGe(TEMPO)] (3) and [LGeEPh] (E = S (4), Se (5)], respectively. An overoxidation of 2 by Ph2Se2 to a mixed valent trinuclear species [{(PhSe)2GeII2(μ-L)2GeIV(SePh)2] (6) is also noted. Besides, the precursor 1 is converted to [LGeMe] (7) and [LGeOSiPh3] (8) by treating with MeMgBr and KOSiPh3, respectively. However, none of them lead to a desired [LGeH] species. Also interestingly, Cl-abstraction from 1 by AgSbF6 fails and they rather form a 2:1 adduct [(LGeCl]2Ag]SbF6 (9).","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"78 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145189113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
ICG revisited: Excited-state dynamics as a function of dye concentration and solvent environment 染料浓度和溶剂环境对激发态动力学的影响
IF 4 3区 化学
Dalton Transactions Pub Date : 2025-09-30 DOI: 10.1039/d5dt01894c
Maria Lahm, Pascal Rauthe, Kai-Ching Fan, Claus Feldmann, Andreas Neil Unterreiner
{"title":"ICG revisited: Excited-state dynamics as a function of dye concentration and solvent environment","authors":"Maria Lahm, Pascal Rauthe, Kai-Ching Fan, Claus Feldmann, Andreas Neil Unterreiner","doi":"10.1039/d5dt01894c","DOIUrl":"https://doi.org/10.1039/d5dt01894c","url":null,"abstract":"Indocyanine green (ICG) is a clinically approved tricarbocyanine dye widely used in medical imaging and photodynamic therapy. Its incorporation into inorganic hybrid nanoparticles (IOH-NPs) offers a highly promising strategy for the targeted delivery of therapeutic agents, particularly in photothermal applications. Despite extensive use of ICG, the influence of solvent and concentration on its excited-state behaviour remains incompletely understood, but an in-depth understanding of these photophysical properties is essential for elucidating its functional role within the IOH-NPs. Therefore, this study combines steady-state and time-resolved spectroscopic methods to examine the dependence of the excited-state dynamics of the first excited singlet state of ICG on both solvent environments and dye concentration. The photophysical behaviour of ICG was characterised in ethanol (EtOH), dimethyl sulfoxide (DMSO) and demineralised water across a systematically varied concentration range from 0.08 to 100 μM. The steady-state absorption behaviour of ICG in EtOH and DMSO largely showed a concentration independence, whereas in water, concentration-dependent H-aggregation was observed. The fluorescence quantum yield (fQY) decreased with increasing dye concentration above approximately 0.2 μM, beginning from approximately 22% in EtOH, 42% in DMSO and 5% in water. The time-resolved studies were conducted by time-correlated-single-photon-counting (TCSPC) at λ_ex = 366 nm and transient-absorption spectroscopy using femtosecond laser pulses at λ_ex = 800 nm. Relaxation from the first excited singlet state of ICG occurs on timescales of 500-600 ps in EtOH, 700-900 ps in DMSO and 120-160 ps in water, reflecting increased nonradiative decay in aqueous solution. In EtOH and DMSO, excited-state dynamics remained largely concentration-independent, while in water aggregation effects became more pronounced at higher concentration. A clear correlation between excited-state lifetime and fQY was observed across all solvents.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"100 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145189116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Catalytic Degradation of N-Acyl Homoserine Lactone Using Copper Complex of TACN Derivative: Implications for Quorum Sensing Interference 用TACN衍生物铜络合物催化降解n -酰基高丝氨酸内酯:群体感应干扰的意义
IF 4 3区 化学
Dalton Transactions Pub Date : 2025-09-30 DOI: 10.1039/d5dt01612f
Denisa Skurková, Hanna Zhukouskaya, Michaela Buziková, Andrii Mahun, Lívia Kanizsová, Miroslav Vetrik, Jan Kotek, Martin Hruby, Tomáš Tobrman
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