Dalton Transactions最新文献_第6页

Investigating Lanthanide Complex Stability through Kinetic and Thermodynamic Competition with Metal Ions and DTPA 通过与金属离子和DTPA的动力学和热力学竞争研究镧系配合物的稳定性

IF 4 3区化学

Dalton Transactions Pub Date : 2025-09-23 DOI: 10.1039/d5dt01624j

Vasileios Mouchtouris, Thomas Just Sørensen

引用次数: 0

Li2CeRbB18O30 and Li2Cs2SrB18O30: promising low-birefringence materials for UV and deep UV zero-order waveplates. Li2CeRbB18O30和Li2Cs2SrB18O30：有前途的紫外和深紫外零阶波片低双折射材料。

IF 4 3区化学

Dalton Transactions Pub Date : 2025-09-22 DOI: 10.1039/d5dt01706h

Xiaoming Wang,Zhiyuan Zhang,Juanjuan Lu,Feng Zhang,Shilie Pan

{"title":"Li2CeRbB18O30 and Li2Cs2SrB18O30: promising low-birefringence materials for UV and deep UV zero-order waveplates.","authors":"Xiaoming Wang,Zhiyuan Zhang,Juanjuan Lu,Feng Zhang,Shilie Pan","doi":"10.1039/d5dt01706h","DOIUrl":"https://doi.org/10.1039/d5dt01706h","url":null,"abstract":"Zero-order waveplates, which are used to modulate the polarization of light, play a crucial role in scientific instrumentation, optical communications, and the laser industry. However, owing to the limitations imposed by birefringence and absorption edges, only few materials can produce desirable birefringence with suitable transparency in the ultraviolet (UV) and deep ultraviolet (DUV) regions. Borates represent promising materials with widely adjustable birefringence. In this study, we successfully synthesized two new borates, Li2CeRbB18O30 and Li2Cs2SrB18O30, using solid-state reactions in vacuum-sealed tubes; the fundamental building blocks (FBBs) of the two compounds are B3O7 and B9O19 units, respectively. Notably, Li2CeRbB18O30 and Li2Cs2SrB18O30 possess very low birefringence values of 0.0058 at 546 nm and 0.0068 at 546 nm, respectively, considerably lower than that of a commercial quartz waveplate (0.0092 at 532 nm). UV-Vis-NIR diffuse reflectance measurements show that the UV cutoff edges of Li2CeRbB18O30 and Li2Cs2SrB18O30 are lower than 320 and 200 nm, corresponding to the bandgaps of 3.20 and 6.20 eV, respectively. These two compounds can serve as potential zero-order waveplate materials in the UV and DUV regions.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"18 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145103570","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

Iridium(III)/rhenium(I) complexes bearing NLG919 as the ligand for enhanced triple-negative breast cancer therapy. 携带NLG919的铱(III)/铼(I)配合物作为三阴性乳腺癌强化治疗的配体。

IF 4 3区化学

Dalton Transactions Pub Date : 2025-09-22 DOI: 10.1039/d5dt01732g

Hou Zhu,Yong-Sheng Yang,Lin-Yuan Zhu,Chun-Rong Jiang,Zheng Zhang,Meng-Ting Xu,Rong-Tao Li,Rui-Rong Ye

{"title":"Iridium(III)/rhenium(I) complexes bearing NLG919 as the ligand for enhanced triple-negative breast cancer therapy.","authors":"Hou Zhu,Yong-Sheng Yang,Lin-Yuan Zhu,Chun-Rong Jiang,Zheng Zhang,Meng-Ting Xu,Rong-Tao Li,Rui-Rong Ye","doi":"10.1039/d5dt01732g","DOIUrl":"https://doi.org/10.1039/d5dt01732g","url":null,"abstract":"Growing evidence has indicated that chemoimmunotherapy has become the most promising approach for treating malignant tumors. Here, we obtained four metal complexes, two iridium(III) complexes [Ir(C^N)2(NLG919)2]PF6 (C^N = 2-(2-thienyl)pyridine (thpy, Ir-NLG-1) and 2-(2,4-difluorophenyl)pyridine (dfppy, Ir-NLG-2)) and two rhenium(I) complexes [Re(N^N)(NLG919)]PF6 (N^N) = 4,7-diphenyl-1,10-phenanthroline (DIP, Re-NLG-1) and 1,10-phenanthroline (phen, Re-NLG-2), by coupling an indoleamine 2,3-dioxygenase (IDO) inhibitor NLG919 with Ir(III) and Re(I) metals, in order to achieve the synergistic efficacy of chemotherapy and immunotherapy. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) test data indicate that the three complexes, Ir-NLG-1, Ir-NLG-2 and Re-NLG-1, exhibit superior cytotoxicity against mouse breast cancer 4T1 cells. The ability to inhibit the IDO enzyme activity of Ir-NLG-1-2/Re-NLG-1 has been confirmed. Further mechanistic studies have shown that these complexes can target mitochondria to cause a decrease in the mitochondrial membrane potential (MMP) and an increase in reactive oxygen species (ROS), disrupting the function of mitochondria, and ultimately triggering cell apoptosis through a mitochondria-mediated Bcl-2/Bax/caspase 3 pathway. The wound healing and colony assays also prove that these complexes significantly inhibit the metastasis of 4T1 cells. Furthermore, while inducing apoptosis, these complexes can also promote the release of damage-related molecular patterns (calreticulin (CRT), high mobility group protein b1 (HMGB1) and adenosine triphosphate (ATP)), thereby inducing immunogenic cell death (ICD).","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"87 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145103544","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

Luminescent Iridium(III) Complexes Bearing Boronic Acid Groups: Potential Sensors for Carbohydrates 含硼酸基团的发光铱（III）配合物：碳水化合物的潜在传感器

IF 4 3区化学

Dalton Transactions Pub Date : 2025-09-22 DOI: 10.1039/d5dt01291k

Rahad Rahman, Nurul H Quazi, Keith Forrest White, Nicolau Saker Neto, Yuning Hong, Marcel Maeder, David John Wilson, Peter Barnard

{"title":"Luminescent Iridium(III) Complexes Bearing Boronic Acid Groups: Potential Sensors for Carbohydrates","authors":"Rahad Rahman, Nurul H Quazi, Keith Forrest White, Nicolau Saker Neto, Yuning Hong, Marcel Maeder, David John Wilson, Peter Barnard","doi":"10.1039/d5dt01291k","DOIUrl":"https://doi.org/10.1039/d5dt01291k","url":null,"abstract":"A family of eight Ir(III) complexes of the form [Ir(X)2(L)]+ (where X = 2-phenylpyridine, 1-phenylpyrazole, 2-phenylbenzothiazole or 1-phenylindazole and L = 2-(pyrazole-1-yl)pyridine substituted with a boronic acid group at position four of either the pyridyl or the pyrazole ring) have been prepared as potential luminescent sensors for carbohydrate detection. These complexes have been fully characterised via1H and 13C NMR, HRMS and for complexes 11, 12, 14, and 18 by X-ray crystallography. Photoluminescent pH titration studies showed conversion of the boronic acid group to the boronate anionic form occurred within the pKa range of 4.9-5.3 for complexes 11-14 and 6.4-7.8 for complexes 15-18, with formation of the boronate anion being accompanied by significant changes in the photoluminescence emission properties of these compounds. Similar pH titration studies were undertaken for the complexes in the presence of glucose and fructose sugars, with the binding constants between these sugars and the complexes via cyclic boronate ester formation estimated from the photoluminescent titration data; significantly stronger binding was observed for fructose compared to glucose. Interestingly, the formation of the cyclic boronate ester results in a consistent decrease in the emission intensity for complexes 12, 13, 16, and 17 while complexes 11, 14, 15, and 18 showed enhanced luminescence. Theoretical calculations support the experimental observations.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"33 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145103741","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

Phosphate Recovery using Porous Monolith MgAl-LDH: Insights from NMR Spectroscopy, Physisorption and Microscopy 磷酸盐回收使用多孔整体MgAl-LDH：从核磁共振光谱，物理吸附和显微镜的见解

IF 4 3区化学

Dalton Transactions Pub Date : 2025-09-20 DOI: 10.1039/d5dt01498k

Kamilla Thingholm Bünning, Per Morgen, Claude Forano, Vanessa Prévot, Anne Selent, Ville-Veikko Telkki, Anu Maria Kantola, Ulla Gro Nielsen

{"title":"Phosphate Recovery using Porous Monolith MgAl-LDH: Insights from NMR Spectroscopy, Physisorption and Microscopy","authors":"Kamilla Thingholm Bünning, Per Morgen, Claude Forano, Vanessa Prévot, Anne Selent, Ville-Veikko Telkki, Anu Maria Kantola, Ulla Gro Nielsen","doi":"10.1039/d5dt01498k","DOIUrl":"https://doi.org/10.1039/d5dt01498k","url":null,"abstract":"Monolithic layered double hydroxides (LDH) may alleviate the challenging separation process after ion-exchange of conventionally polycrystalline (powdery) LDH, which have been extensively tested as potential phosphate sorbents. However, the structure, ion-exchange properties, and stability of monolithic LDH have been sparingly studied and a detailed understanding of these properties is lacking. The phosphate (P) removal properties, structure, including porous network and stability of two MgAl-LDH and an Al(OH)3 monolithic composite with a high surface area (130−211 m2/g) were investigated in detail. The LDH monoliths are a mixture of amorphous Al(OH)3 and nano-crystalline MgAl-LDH (≈ 50%) and their phosphate removal capacity (≈ 50 mgP/g) is comparable to polycrystalline LDH, but only around half of the phosphate is removed by the LDH phase based on solid state 27Al, 31P and 35Cl NMR spectroscopy. Single pulse and 2D EXSY 129Xe NMR spectroscopy identified micro-, meso- and macro-porous environments. Micropore formation is related to the Al(OH)3 phase, which forms first during the synthesis, whereas the meso- and microporous environments are assigned to the LDH-phase subsequently formed. The main porous environments are well connected at a low Mg content, but to a lesser extent at higher Mg content. After P sorption, the monolith experienced a decreased crystallinity and dissolution of some Al(OH)3 (4−10%) or LDH (10%). Moreover, the pores are generally stable but disconnected likely by the phosphate species formed, based on 129Xe EXSY NMR. Thus, monolithic LDH suffers from the same challenge as polycrystalline LDH in relation to stability in a phosphate solution.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"32 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145089542","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

(Sr3Ca4)(Ca2Ga6)O18:Mn4+: crystallographic spatial isolation enables high doping levels, exceptional antithermal quenching, and promising temperature sensing applications （Sr3Ca4）（Ca2Ga6）O18:Mn4+：晶体空间隔离实现了高掺杂水平、优异的抗热淬火和有前途的温度传感应用

IF 4 3区化学

Dalton Transactions Pub Date : 2025-09-19 DOI: 10.1039/d5dt02222c

Yaxin Xu, Xiangxiang Jing, Jia Yang, Zien Cheng, Rihong Cong, Tao Yang, Pengfei Jiang

{"title":"(Sr3Ca4)(Ca2Ga6)O18:Mn4+: crystallographic spatial isolation enables high doping levels, exceptional antithermal quenching, and promising temperature sensing applications","authors":"Yaxin Xu, Xiangxiang Jing, Jia Yang, Zien Cheng, Rihong Cong, Tao Yang, Pengfei Jiang","doi":"10.1039/d5dt02222c","DOIUrl":"https://doi.org/10.1039/d5dt02222c","url":null,"abstract":"Mn4+-activated oxide phosphors have been extensively studied as promising candidates for red phosphors. However, their practical applications are significantly hindered by severe thermal quenching and the inherently low absorption capability in blue light caused by low doping concentration. In this work, we report a novel Mn4+-activated phosphor series, (Sr3Ca4)(Ca2Ga6)O18:xMn4+ (SCCGO:xMn4+), where Mn4+ emitters are confined within well-separated perovskite-like structural units, spaced more than 10.9 Å apart. This special isolation effectively suppresses concentration quenching, thus enabling a high optimal doping level of x = 0.06, an order of magnitude higher than that in perovskites. The structural confinement effect also facilitates strong coupling between the Mn4+ red-emission and the local MnO6 octahedral vibrations, thereby resulting in tunable thermal quenching (TQ) behaviors. Impressively, Mg2+-modified phosphor SCCM0.25GO:0.045Mn4+ exhibits pronounced anti-TQ behavior, retaining 142% of its room temperature emission intensity at 423 K, outperforming hitherto reported Mn4+-activated phosphors. In contrast, SCCGO:0.03Mn4+ exhibits conventional TQ performance but demonstrates exceptional relative sensitivity (Sr = 4.70 % K-1 at 200 K) and outstanding temperature resolution (δT = 0.002 K), surpassing existing lifetime-based optical thermometers. The findings highlight the effectiveness of crystallographic confinement of Mn4+ emitters as a powerful strategy for designing multifunctional, high-performance Mn4+-activated oxide phosphors with superior luminescence thermal stability and advanced thermometric sensing capabilities.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"73 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145083880","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

Assembly-Dependent Thermochromic and Photochromic Luminescence in Pentiptycene-Based Homoleptic Gold(I) Alkynyl Clusters [(AuC≡CR)n] 戊炔基同色金(I)炔基团簇的组装依赖性热致变色和光致变色发光[(AuC≡CR)n]

IF 4 3区化学

Dalton Transactions Pub Date : 2025-09-19 DOI: 10.1039/d5dt02075a

Ying-Feng Hsu, Shih-Ying Cheng, Che-An Cheng, Yu-Hsuan Kang, Yi-Hung Liu, Kien Voon Kong, Jye-Shane Yang

引用次数: 0

Rhodium(I) Complexes with Proton-Responsive Anionic Tethered N-Heterocyclic Carbene Ligands: Synthesis and Application in Alkyne Dimerization 质子响应性阴离子系链n杂环碳配体铑配合物的合成及其在炔二聚化中的应用

IF 4 3区化学

Dalton Transactions Pub Date : 2025-09-19 DOI: 10.1039/d5dt01516b

Mert Olgun Karataş, Diego R. Hinojosa, Vincenzo Passarelli, Luis A Oro, Jesús J. Pérez-Torrente, Ricardo Castarlenas Chela

{"title":"Rhodium(I) Complexes with Proton-Responsive Anionic Tethered N-Heterocyclic Carbene Ligands: Synthesis and Application in Alkyne Dimerization","authors":"Mert Olgun Karataş, Diego R. Hinojosa, Vincenzo Passarelli, Luis A Oro, Jesús J. Pérez-Torrente, Ricardo Castarlenas Chela","doi":"10.1039/d5dt01516b","DOIUrl":"https://doi.org/10.1039/d5dt01516b","url":null,"abstract":"A series of rhodium(I) complexes of formula Rh{κ2C,X-(IDippR)}(cod) and Rh{κ2C,X-(IDippR)}(CO)2 {IDippR = 1-(R)-3-(2,6-diisopropylphenyl)-imidazolin-2-carbene; X = N, O; R = (6-yl-2-pyridone), (CH2CH2NC(=O)Ph), (CH2CH2COO); (cod = 1,5-cyclooctadiene)} containing anionic-tethered NHC-functionalized ligands, including pyridonato, amidato or carboxylato groups at the N-wingtip has been prepared and their application to alkyne homocoupling has been investigated. The chelate coordination of the NHC-functionalized ligand generates 5, 6 and 7-membered metallacycles for pyridonato, amidato and carboxylato substituents, respectively. Preparation of the mixed bis-NHC derivative Rh{κ2C,O-(IDippCarbx)}(CO)(IPr) {IPr = 1,3-bis-(2,6-diisopropylphenyl)-imidazolin-2-carbene} is possible due to lability of one of the CO ligands in the bis-CO precursor. Reversible protonation is observed for pyridonato and carboxylato moieties but not for amidato counterpart. Alkyne dimerization catalytic activity is reported for N-based anionic groups whereas carboxylato counterparts are inefficient. A proton transfer mechanism is invoked for the gem-selectivity observed for cod-based catalysts whereas alkyne insertion is the regioselectivity-determining step for CO-containing analogues.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"14 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145083877","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

Porous organic polymers containing organic photosensitizer and metal-terpyridine molecules for efficient aqueous CO2 photoreduction 含有机光敏剂和金属三联吡啶分子的多孔有机聚合物，用于有效的水相CO2光还原

IF 4 3区化学

Dalton Transactions Pub Date : 2025-09-19 DOI: 10.1039/d5dt01930c

Youting Fang, Linfeng Sun, Yilin Xue, Duobin Chao

引用次数: 0

A new therapeutic perspective for metal-based drugs 金属基药物治疗的新前景

IF 4 3区化学

Dalton Transactions Pub Date : 2025-09-19 DOI: 10.1039/d5dt01567g

Norah Barba Behrens, Rodrigo Castro-Ramírez

引用次数: 0