Transition Metal Chemistry最新文献

{"title":"Strong antiferromagnetic interaction in µ-Oxo-bridged diiron(III) complex and paramagnetic nickel(II) complex of pyridoxal Schiff base ligands","authors":"Viera Murašková,&nbsp;Václav Eigner,&nbsp;David Sedmidubský","doi":"10.1007/s11243-025-00713-y","DOIUrl":"10.1007/s11243-025-00713-y","url":null,"abstract":"<div><p>Dinuclear and mononuclear pyridoxal Schiff base complexes, specifically [{FeL}₂(<i>µ</i>-O)]·2.2H₂O (<b>1</b>) and [NiL’(H₂O)]·2H₂O (<b>2</b>) (where L^2– is the dianion of tetradentate pyridoxal Schiff base generated in situ by the iron-catalyzed oxidative C − N bond cleavage of the initial pentadentate Schiff base, and L’^2– is the dianion of pentadentate Schiff base ligand formed from pyridoxal and <i>N</i>-(2-aminoethyl)propane-1,3-diamine) have been synthesized and characterized by elemental analysis, Fourier transform infrared spectroscopy, and mass spectrometry. The crystal structures of these complexes were determined using single-crystal X-ray diffraction. The Fe atoms in complex <b>1</b> exhibit a distorted square pyramidal coordination geometry, while Ni atom in complex <b>2</b> displays a distorted octahedral geometry. The most significant finding is the strong antiferromagnetic exchange coupling observed in the diiron complex <b>1</b>. Magnetic susceptibility data revealed an exchange coupling constant of <i>J</i> = − 173 cm^–1, confirming its potential role as a model for non-heme diiron metalloenzymes. In contrast, complex <b>2</b> exhibits typical paramagnetic behavior of an octahedral Ni(II) complex with two unpaired electrons. Calculations based on density functional theory confirmed the high-spin state of the Fe(III) centers in the diiron complex and verified the magnitude of the strong antiferromagnetic exchange coupling. For the nickel complex, these calculations also revealed a significant degree of bond covalency, providing a comprehensive understanding of the structural and magnetic properties of these pyridoxal-based coordination compounds.</p></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"51 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11243-025-00713-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339808","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}

{"title":"A environment-friendly utilization of flue gas desulfurization residue for removing hexavalent chromium from electroplating wastewater","authors":"Dean Fang,&nbsp;Xueyuan Li,&nbsp;Xiangxin Xue","doi":"10.1007/s11243-026-00714-5","DOIUrl":"10.1007/s11243-026-00714-5","url":null,"abstract":"<div><p>A novel environment-friendly utilization manner of the flue gas desulfurization residue from wet magnesia flue gas desulfurization process and semi-dry calcium flue gas desulfurization process was proposed. In this article, the wet magnesia flue gas desulfurization residue and the semi-dry calcium flue gas desulfurization residue were respectively regarded as a high price-performance water treatment agent to detoxify the hexavalent chromium in the electroplating wastewater. The main technological mechanism and optimal parameters of the hexavalent chromium removal process were investigated. When the detoxification process was performed by using a residue from wet magnesia flue gas desulfurization process, the residual pollutant concentration in treated wastewater under the optimal experimental parameters was as follow: the hexavalent chromium residue decreased to 0.035 mg/L, total chromium residue decreased to 0.08 mg/L and magnesium residue was 73.5 mg/L. When the detoxification process was performed by using a residue from semi-dry calcium flue gas desulfurization process, the residual pollutant concentration in treated wastewater under the optimal experimental parameters was as follow: the hexavalent chromium residue decreased to 0.021 mg/L, total chromium residue decreased to 0.085 mg/L and calcium residue was 227 mg/L. The present work not only provided a new resource utilization approach of desulfurization residue from wet magnesia desulfurization technology and semi-dry calcium desulfurization technology, but also provided a high price-performance, efficient and environmentally friendly detoxification process for the electroplating wastewater which give attention to economic benefit and environmental factors.</p></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"51 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339935","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}

{"title":"Eco-friendly thermolytic synthesis of PbS nanoparticles using single source precursor: role of castor oil and ricinoleic acid in tailoring particle properties","authors":"Ginena Bildard Shombe,&nbsp;Sixberth Mlowe","doi":"10.1007/s11243-025-00709-8","DOIUrl":"10.1007/s11243-025-00709-8","url":null,"abstract":"<div><p>Growing concerns over the toxicity and environmental impact of conventional surfactants have accelerated the search for eco-friendly capping agents for nanomaterials synthesis. In this study, we have employed castor oil (CO) and ricinoleic acid (RA) as green capping and dispersing agents in the preparation of PbS nanoparticles. The synthesis was carried out via thermolysis of bis(tetrahydroquinolinedithiocarbamato)lead(II) complex at temperatures ranging from 190 to 300 °C. The influence of the nature of the capping agent and the synthesis temperature on the morphology, structure, and optical properties of the synthesized particles was studied. P-XRD analysis demonstrated formation of crystalline, phase pure cubic rock salt PbS at all reaction conditions. Morphological characterization revealed distinct, temperature dependent evolution of particle morphologies. Castor oil-capped nanoparticles exhibited a progression in anisotropic morphologies with increasing temperature, in which a mixed population of quasi-spherical particles, nanorods, multipods, and cuboidal structures were observed at 190 °C, while predominantly branched star-like structures were formed at higher temperatures. In contrast, ricinoleic acid capped nanoparticles displayed a transition from quasi-spherical to cuboidal and rod-like structures with increasing temperature, which reflects a balance between kinetic and thermodynamic growth pathways. UV-Vis-NIR spectra of all the synthesized particles were blue shifted relative to bulk PbS, with Tauc analysis yielding direct band gaps in the range of 1.125–0.816 eV, confirming the synthesis of nanoscale PbS. This study highlights the potential of both castor oil and its major fatty acid component, ricinoleic acid, as renewable, biodegradable, and environmentally benign capping and dispersing agents for the green synthesis of PbS nanoparticles.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"51 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339936","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}

{"title":"Hierarchical gold nanoflowers via PIL-mediated facile synthesis: toward ultrasensitive SERS sensing of Rhodamine 6G","authors":"Shijie Li,&nbsp;Chenchen Zhao,&nbsp;Lingyu Wang,&nbsp;Xiaoqi Feng,&nbsp;Jiaqiang Hou,&nbsp;Tianyu Gao,&nbsp;Guoli Yang,&nbsp;Kaisheng Yao","doi":"10.1007/s11243-026-00719-0","DOIUrl":"10.1007/s11243-026-00719-0","url":null,"abstract":"<div><p>To address the limitations of traditional synthesis methods for gold nanostructures, which rely on high temperatures, toxic reagents, and harsh conditions, this study proposes an eco-friendly strategy for synthesizing gold spikelet nanoflowers using poly(ionic liquid) (PIL) as a structure-directing agent. By employing HAuCl₄ as the precursor and ascorbic acid (AA) as the reducing agent, hierarchical Au spikelet nanoflowers with tertiary structure were successfully prepared via a one-pot method in a 60 °C water bath. Systematic investigation of the influencing factors revealed that temperature, AA concentration, and PIL concentration collectively determine the product morphology, with PIL concentration exerting the most significant influence on both the morphology and hierarchical structure of the Au nanoflowers. Using Rhodamine 6G (R6G) as a molecular probe, the resulting substrate exhibited exceptional surface-enhanced Raman scattering (SERS) sensitivity, achieving a detection limit of 10^− 12 M for R6G, which surpasses the performance of most reported Au/Ag-based materials, and demonstrates high reproducibility (&lt; 2% average relative deviation (RAD) from measurements at five randomly selected locations). This work provides a sustainable approach for fabricating high-performance SERS substrates, demonstrating promising potential for applications in biological sensing and diagnostics.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"51 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339932","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}

{"title":"Efficient storage and separation of methane using the metal–organic frameworks M2(m-dobdc)(M = Fe, Co, Ni, and Cu): a first-principles study","authors":"Ali M. Hussein,&nbsp;Narinderjit Singh Sawaran Singh,&nbsp;Muktha Eti,&nbsp;Tanmoy Prida,&nbsp;S. Radhika,&nbsp;Gaganjot Kaur,&nbsp;Saodatkhon Ibragimova,&nbsp;Akmal Abilkasimo,&nbsp;Abdusalom Umarov,&nbsp;Aseel Smerat,&nbsp;Wissam Aziz Yousif","doi":"10.1007/s11243-026-00715-4","DOIUrl":"10.1007/s11243-026-00715-4","url":null,"abstract":"<div>\u0000 \u0000 <p>Methane (CH₄) storage media play a crucial role in promoting sustainable development. However, current materials encounter challenges related to storage capacity and operational conditions. Therefore, it is essential to develop new and innovative materials for capturing and storing CH₄. The versatility of metal-organic frameworks (MOFs) allows for significant opportunities in this area due to their ease of functionalization. This inclusive innovation study explores the adsorption properties of CH₄ in M₂(m-dobdc) MOFs (M = Fe, Co, Ni, Cu; m-dobdc⁴⁻=4,6-dioxido-1,3-benzenedicarboxylate) through first-principles calculations. Strong orbital interactions between the M and surrounding oxygens result in notable charge depletion on the metal atoms, making them potential sites for CH₄ adsorption. The strength of CH₄ adsorption at each metal site is evaluated by analyzing the adsorption energy, charge transfer, charge density difference map, and partial density of states. The type of metal atom has a minimal influence on the CH₄ storage capacity of M₂(m-dobdc) frameworks. The findings reveal that M₂(m-dobdc) can hold up to 18 CH₄ molecules (per unit cell) with an average adsorption energy of about − 0.44 eV. The M₂(m-dobdc) frameworks can efficiently store and separate CH₄ molecules at moderate temperatures and pressures. Furthermore, M₂(m-dobdc) frameworks demonstrate outstanding capability for separating CH₄ from CH₄/CF₄, CH₄/N₂, CH₄/CO_2, and CH₄/H₂ binary mixtures. This study could pave the way for advancing functionalized MOFs that possess a significant capacity for CH₄ capture.</p>\u0000 </div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"51 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339934","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}

{"title":"Synthesis and characterization of pure ZnO and ZnO supported MgF2 for catalytic acylation of phenol","authors":"Ika Fitri Ulfindrayani,&nbsp;Irmina Kris Murwani,&nbsp;Eko Sri Kunarti,&nbsp;Afifah Rosyidah,&nbsp;Harsasi Setyawati,&nbsp;Qurrota A’yuni,&nbsp;Abdul Wafi,&nbsp;Eka Cahya Muliawati","doi":"10.1007/s11243-025-00710-1","DOIUrl":"10.1007/s11243-025-00710-1","url":null,"abstract":"<div><p>The catalysts MgF₂ supported ZnO (0; 2.5; 5; 7.5; 10 and 15% <i>w</i>/<i>w</i>) were synthesized by sol-gel method. The structure of the catalysts were characterized by XRD. The acidity of the catalyst determined by pyridine-FTIR method showed that 7.5% ZnO/MgF₂ had the highest acidity. The surface area of the ZnO/MgF₂ was measured by N₂ adsorption-desorption method. The surface area of the ZnO/MgF₂ catalysts decrease with the increase in Zn content. The measurement S_BET of the catalysts was in range of 5.31 to 9.44 m²/g. The morphology of the catalyst was observed by Scanning Electron Microscope (SEM). The synthesized catalysts performance was tested in phenol acylation and were determined by High Performance Liquid Chromatography (HPLC), which the main products were <i>p</i>-HAP (hydroxyacetophenone) and PA (phenyl acetate). The formation of <i>p</i>-HAP was influenced by the Lewis acid site, while PA was influenced by the Brønsted acid site. The highest conversion was achieved 85.36% by 7.5% ZnO/MgF₂, while the yields of the <i>p</i>-HAP and PA were 56.06 and 23.40% respectively.</p></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"51 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339236","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}

{"title":"(Benz)imidazole-based NHC complexes as anticancer frontiers: selenium and silver","authors":"Ghazanfar Abbas,&nbsp;Tanveer Hussain Bokhari,&nbsp;Maham Fatima,&nbsp;Adnan Majeed,&nbsp;Muhammad Adnan Iqbal","doi":"10.1007/s11243-025-00704-z","DOIUrl":"10.1007/s11243-025-00704-z","url":null,"abstract":"<div><p>Cancer, a leading cause of global mortality, demands the development of targeted therapies due to rising treatment resistance and limited efficacy of current drugs. N-heterocyclic carbenes (NHCs) represent a unique class of ligands, primarily due to their strong σ-donor and weak π-acceptor properties, making them highly valuable in organometallic and medicinal chemistry. The metal-NHC complexes are prepared by reacting the respective azolium salts with the appropriate metal sources. In recent years, metal complexes have gained considerable attention for their promising cytotoxic activity, particularly NHC-based metal complexes that demonstrate superior anticancer efficacy compared to conventional chemotherapeutic agents. This review provides a comprehensive overview of advances made over the past five years in organoselenium and silver-NHC complexes derived from (benz)imidazole, highlighting their significant potential in anticancer applications. The antitumor activities, proposed mechanisms of action, and structure–activity relationships of NHC-based metallodrugs are systematically reviewed. We hope this review inspires researchers to design novel metal-based NHC compounds for cancer treatment.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><img></picture></div></div></figure></div></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"51 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338914","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}

{"title":"Carbazole benzaldehyde: A highly selective and sensitive “turn-off” fluorometric sensor for Fe3+ detection","authors":"Ahmet Battal","doi":"10.1007/s11243-026-00722-5","DOIUrl":"10.1007/s11243-026-00722-5","url":null,"abstract":"<div><p>In this study, 4-(9’-hexylcarbazol-3’-yl)benzaldehyde (probe <b>C</b>) with the structure of donor-π-acceptor was studied as a new sensor. The selectivity and sensitivity properties of probe <b>C</b> against various analytes were investigated by using absorption (UV-Vis) and fluorescence (PL) spectroscopy. Only with the addition of Fe³⁺ and Fe²⁺, the absorption spectrum of probe <b>C</b> slightly changed, while the maximum emission intensity at 482 nm of probe <b>C</b> dramatically changed in the presence of various interfering analytes. Hence, probe <b>C</b> exhibited high selectivity towards Fe³⁺ with the limit of detection (LOD) value of 2.3 nM. This LOD value lies in among the best values reported so far for the carbazole-based fluorescent sensors. The binding stoichiometry, stoichiometric interaction ratio and binding site between probe <b>C</b> and Fe³⁺ were established by Job’s plot, ¹H-NMR, HRMS and FT-IR analyses. Job’s plot indicated that the stoichiometric ratio between probe <b>C</b> and Fe³⁺ was 2:1. ¹H-NMR and FT-IR spectra showed that Fe³⁺ formed a complex with probe <b>C</b> via the non-bonding electron pair on the oxygen atom of the formyl group. Probe <b>C</b> was tested for the detection of Fe³⁺ in 3 different real water samples by spike and recovery method. It was observed that probe <b>C</b> worked successfully in the detection of Fe³⁺. From these, it was concluded that probe <b>C</b> can be successfully used as a “turn-off” fluorometric sensor for the detection of Fe³⁺.</p><h3>Graphical Abstract</h3><p>Probe <b>C</b>, composed of carbazole-phenylene-formyl units, functions as a good “turn-off” fluorescent sensor for Fe³⁺ detection, demonstrating high selectivity and low detection limit of 2.3 nM. It enables real-time monitoring of Fe³⁺ in real-world water samples with remarkable selectivity.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"51 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338112","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}

{"title":"Advances and prospects of lead-free metal halide perovskites for solar hydrogen fuel generation","authors":"Alberto Boretti","doi":"10.1007/s11243-025-00712-z","DOIUrl":"10.1007/s11243-025-00712-z","url":null,"abstract":"<div><p>Photocatalytic hydrogen production powered by solar energy is a foundational technology for a sustainable hydrogen economy. Lead-free metal halide perovskites (MHPs) are at the forefront of this field, lauded for their superb optoelectronic properties and environmental compatibility. However, realizing their full potential requires overcoming the significant stability and performance challenges that have hindered widespread adoption. This article provides a critical and updated assessment of the remarkable progress in lead-free MHP development, with a specific focus on compositions centered around tin (Sn), bismuth (Bi), antimony (Sb), and copper (Cu), as well as advanced double perovskite structures. We explore the core principles of material design, from crystal and electronic band structure engineering to innovative strategies for enhancing stability in aqueous environments, such as heterostructuring, dimensionality control, and surface passivation. The analysis includes a review of performance benchmarks, including hydrogen evolution rates now exceeding 1700 μmol g⁻¹ h⁻¹ (among the highest reported for tin-based systems and competitive with some lead-based analogues), and the optimization techniques that enable such achievements. Despite these advances, formidable challenges remain in achieving long-term operational stability and closing the efficiency gap with both lead-based counterparts and the targets for economic viability, which project a need for green hydrogen costs below $2/kg. We conclude by outlining the key future research frontiers essential for propelling these eco-friendly photocatalysts toward large-scale solar fuel generation. These frontiers include the urgent need for standardized testing protocols, a deeper mechanistic understanding through operando studies, and the integration of machine learning for accelerated materials discovery and inverse design, all of which are imperative for translating laboratory breakthroughs into practical, impactful technologies.</p></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"51 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338108","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}

{"title":"Stability constants of macrocyclic tetrathioether complexes of Nickel and Cobalt","authors":"Chandrika P. Kulatilleke,&nbsp;Brian Sarango,&nbsp;Valeriya Shaporova,&nbsp;Ying Pan","doi":"10.1007/s11243-025-00702-1","DOIUrl":"10.1007/s11243-025-00702-1","url":null,"abstract":"<div><p>Determining stability constants provides insight into metal-ligand affinity and complex stability, essential for understanding selectivity and potential applications. In this regard, we measured the stability constants of first row transition metal ions with macrocyclic tetrathioethers. namely, 1,4,7, 10-tetrathiocyclododecane ([12]aneS₄), 1,4,8,11-tetrathiocyclotetradecane ([14]aneS₄) and 1,5,9,13-tetrathiocyclohexadecane ([16]aneS₄). All three ligands have the same number of sulfur atoms but different number of atoms making the overall structure and the size of the cavity of the ligand increase from [12]aneS₄ to [16]aneS₄. The metal ions selected for the study were chromium, manganese, iron, cobalt and nickel. The stability constants of the complexes that showed observable complex formation in solutions were measured using the McConnell-Davidson method. Out of the metal ions studied, only nickel and cobalt show observable complex formation. Although nickel forms measurable complexes with all three macrocyclic ligands, cobalt forms a complex only with [14]aneS₄. Chromium, manganese and iron do not show any complex formation with the macrocyclic tetrathioethers investigated in this study. The stability constants determined are as follows: Ni^II([12]aneS₄) (4.0 M^-1), Ni^II([14]aneS₄) (75.0 M^-1), Ni^II([16]aneS₄) (166.0 M^-1) and Co^II([14]aneS₄) (133.0 M^-1). The nickel complexes show a slight increase in stability constants going from [12]aneS₄ to [16]aneS₄. The stability constant of Co^II( [14]aneS₄) (133.0 M^-1) exceeds that of Ni^II([14]aneS₄) (75.0. M^-1). To the best of our knowledge, this is the first report of determination of apparent stability constants for Ni^II([12]aneS₄), Ni^II([16]aneS₄) and Co^II([14]aneS₄). Job’s plots indicate that both metal ions, cobalt and nickel form 1:1 metal to ligand complexes with all three macrocyclic tetrathioethers in solution. The stability constants obtained in the present study are compared with reported stability constants of copper complexes with the same macrocyclic tetrathioethers.</p></div>","PeriodicalId":803,"journal":{"name":"Transition Metal Chemistry","volume":"51 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337128","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}