Qi Zheng, Amy Ren, Alexandra Zagalskaya, Haiyan Mao, Daewon Lee, Chongqing Yang, Karen C. Bustillo, Liwen F. Wan, Tuan Anh Pham, Jeffrey A. Reimer, Jian Zhang, Yi Liu, Haimei Zheng
{"title":"Multistep Growth Pathway of Covalent Organic Framework Onion Nanostructures","authors":"Qi Zheng, Amy Ren, Alexandra Zagalskaya, Haiyan Mao, Daewon Lee, Chongqing Yang, Karen C. Bustillo, Liwen F. Wan, Tuan Anh Pham, Jeffrey A. Reimer, Jian Zhang, Yi Liu, Haimei Zheng","doi":"10.1021/jacs.4c14196","DOIUrl":"https://doi.org/10.1021/jacs.4c14196","url":null,"abstract":"The growth of complex organic macromolecular materials in solution is a pervasive phenomenon in both natural and synthetic systems, yet the underlying growth mechanisms remain largely unresolved. Using liquid-phase transmission electron microscopy (TEM), we elucidate the real-time growth pathways of covalent organic framework (COF) onion nanostructures, which involve graphitic layer formation, subsequent layer attachment, onion ring closure, and structural relaxation. This process is marked by variations in orientation and curvature, driven by the dynamic formation of the COF structure, which further regulates order–disorder transition and defect generation within the framework. Our <i>in situ</i> TEM characterizations provide valuable insights into how molecular arrangement drives the formation of complex nanostructures. We anticipate that direct imaging of COF nanostructure growth in liquids will open new opportunities for controlling COF crystal morphology, composition, and hierarchical structure development.","PeriodicalId":49,"journal":{"name":"Journal of the American Chemical Society","volume":"11 1","pages":""},"PeriodicalIF":15.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Triggering the Dual-Metal-Site Lattice Oxygen Mechanism with In Situ-Generated Mn3+ Sites for Enhanced Acidic Oxygen Evolution","authors":"Jianyun Liu, Tanyuan Wang, Mingzi Sun, Mengyi Liao, Shiyu Wang, Shuxia Liu, Hao Shi, Yang Liu, Yue Shen, Ruiguo Cao, Yunhui Huang, Bolong Huang, Qing Li","doi":"10.1021/jacs.4c14338","DOIUrl":"https://doi.org/10.1021/jacs.4c14338","url":null,"abstract":"The development of high-performance non-Ir/Ru catalysts for the oxygen evolution reaction (OER) in acid is critical for the applications of proton exchange membrane water electrolyzers (PEMWEs). Here, we report a new kind of heterostructure catalyst by loading 5.8% Ag nanoparticles on MnO nanorods (Ag/MnO) for acidic OER. The as-prepared Ag/MnO requires only an overpotential of 196 mV for the OER at a current density of 10 mA cm<sup>–2</sup> in 0.5 M H<sub>2</sub>SO<sub>4</sub> and operates in a PEMWE for over 300 h at a current density of 200 mA cm<sup>–2</sup>, representing one of the best non-Ir/Ru OER catalysts. <i>Operando</i> X-ray absorption spectroscopy confirms that the introduction of trace Ag can promote the generation of highly active Mn<sup>3+</sup>–O sites with oxygen vacancies at a low voltage, leading to a dual-metal-site lattice oxygen-mediated pathway with faster kinetics than the adsorbate evolution mechanism. Theoretical calculations indicate that the trace Ag promotes the overlap between the d orbitals of Mn and the s, p orbitals of O, thereby activating the lattice oxygen and reducing the OER energy barrier. The dissolution of Mn is also suppressed by Ag due to the increased energy for vacancy formation of Mn, where the stability number reaches a high value of 3058, supporting improved structural stability.","PeriodicalId":49,"journal":{"name":"Journal of the American Chemical Society","volume":"61 1","pages":""},"PeriodicalIF":15.0,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jennifer N. Whetter, Dariusz Śmiłowicz, Kaelyn V. Becker, Eduardo Aluicio-Sarduy, Cormac A. A. Kelderman, Angus J. Koller, Owen M. Glaser, Axia Marlin, Shin Hye Ahn, Margarita N. Kretowicz, Jonathan W. Engle, Eszter Boros
{"title":"Phosphonate-Based Aza-Macrocycle Ligands for Low-Temperature, Stable Chelation of Medicinally Relevant Rare Earth Radiometals and Radiofluorination","authors":"Jennifer N. Whetter, Dariusz Śmiłowicz, Kaelyn V. Becker, Eduardo Aluicio-Sarduy, Cormac A. A. Kelderman, Angus J. Koller, Owen M. Glaser, Axia Marlin, Shin Hye Ahn, Margarita N. Kretowicz, Jonathan W. Engle, Eszter Boros","doi":"10.1021/jacs.4c11254","DOIUrl":"https://doi.org/10.1021/jacs.4c11254","url":null,"abstract":"Radioisotopes of fluorine (<sup>18</sup>F), scandium (<sup>43/44</sup>Sc, <sup>47</sup>Sc), lutetium (<sup>177</sup>Lu), and yttrium (<sup>86</sup>Y, <sup>90</sup>Y) have decay properties ideally suited for targeted nuclear imaging and therapy with small biologics, such as peptides and antibody fragments. However, a single-molecule strategy to introduce these radionuclides into radiopharmaceuticals under mild conditions to afford inert in vivo complexes is critically lacking. Here, we introduce H<sub>4</sub>L2 and H<sub>4</sub>L3, two small-cavity macrocyclic chelator structural isomers bearing a single phosphonate functional group. Potentiometry and spectrophotometry were employed to determine H<sub>4</sub>L2 and H<sub>4</sub>L3′s ability to form a single [M(L)]<sup>−</sup> species with metals of different sizes (Sc<sup>3+</sup>, Lu<sup>3+</sup>, and Y<sup>3+</sup>) under physiologically relevant conditions. NMR spectroscopy and density functional theory (DFT) calculations suggest modulation of H<sub>4</sub>L2 and H<sub>4</sub>L3′s inner-sphere hydration across the Sc<sup>3+</sup>/Lu<sup>3+</sup>/Y<sup>3+</sup> series. Radiochemical labeling experiments with <sup>18</sup>F, <sup>44</sup>Sc, <sup>177</sup>Lu, and <sup>86</sup>Y reveal that H<sub>4</sub>L2 selectively chelates radioscandium at room temperature with high apparent molar activity (AMA, 462 mCi/μmol), while radiofluorination remains inaccessible. In contrast, H<sub>4</sub>L3 enables room temperature radiochelation <sup>44</sup>Sc, <sup>177</sup>Lu, and <sup>86</sup>Y (AMA: 96–275 mCi/μmol) and incorporates <sup>18</sup>F via the Sc–<sup>18</sup>F methodology to form [<sup>18</sup>F][ScF(L3)]<sup>2–</sup>. In vivo biodistribution analysis at 1 h postinjection confirms the broad utility of H<sub>4</sub>L3: all four radiochemical complexes clear off-target organs and remain >98% intact in urine metabolite analyses. The scope of room temperature radiochemical labeling, paired with facile <sup>18</sup>F incorporation, to afford in vivo compatible complexes exceeds the clinical gold standard chelator DOTA and previously reported acyclic chelators, rendering H<sub>4</sub>L3 promising for prospective radiopharmaceutical applications.","PeriodicalId":49,"journal":{"name":"Journal of the American Chemical Society","volume":"254 1","pages":""},"PeriodicalIF":15.0,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Geminal Synergy in Pt–Co Dual-Atom Catalysts: From Synthesis to Photocatalytic Hydrogen Production","authors":"Aonan Zhu, Yutao Cao, Ning Zhao, Yongcheng Jin, Yonglong Li, Ling Yang, Cancan Zhang, Yangxuan Gao, Zhao Zhang, Yuying Zhang, Wei Xie","doi":"10.1021/jacs.4c09611","DOIUrl":"https://doi.org/10.1021/jacs.4c09611","url":null,"abstract":"Dual-atom catalysts (DACs) have garnered significant interest due to their high atom utilization and synergistic catalysis. However, developing a precise synthetic method for DACs and comprehending the underlying catalytic mechanisms remain challenging. In this study, we employ a photoinduced anchoring strategy to precisely synthesize PtCo DAC on graphitic carbon nitride (CN). A Co atom was anchored on CN through the lone-pair electrons of nitrogen. Upon light irradiation, photoelectrons gathering at the Co site can anchor Pt metal ions nearby, accurately facilitating the formation of heteronuclear DACs. The PtCo DAC demonstrates a remarkably high H<sub>2</sub> generation rate from ammonia borane (AB) hydrolysis, with a TOF of 3130 mol<sub>H2</sub> mol<sub>Pt</sub><sup>–1</sup> min<sup>–1</sup> at 298 K. This TOF value is approximately 3.2 times higher than that of the Pt single-atom photocatalyst. Importantly, the PtCo DAC shows good stability, achieving a turnover number as high as 307,982 mol<sub>H2</sub> mol<sub>Pt</sub><sup>–1</sup> at room temperature. The experimental and theoretical calculation results demonstrate that the synergy between Pt and Co optimizes the adsorption energy of AB and H<sub>2</sub> molecules while reducing the energy barrier of the rate-determining step, thus accelerating H<sub>2</sub> evolution from AB hydrolysis. Additionally, the introduced Co species stabilize the Pt active sites by enhancing the stability of the Pt–N bond, preventing leaching, aggregation, and deactivation. The excellent catalytic performance, good stability, and low cost of the catalysts in this work open new prospects for their practical application in hydrogen production.","PeriodicalId":49,"journal":{"name":"Journal of the American Chemical Society","volume":"197 1","pages":""},"PeriodicalIF":15.0,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jiangtao Wang, Xudong Zheng, Gregory Pitner, Xiang Ji, Tianyi Zhang, Aijia Yao, Jiadi Zhu, Tomás Palacios, Lain-Jong Li, Han Wang, Jing Kong
{"title":"Remote-Contact Catalysis for Target-Diameter Semiconducting Carbon Nanotube Arrays","authors":"Jiangtao Wang, Xudong Zheng, Gregory Pitner, Xiang Ji, Tianyi Zhang, Aijia Yao, Jiadi Zhu, Tomás Palacios, Lain-Jong Li, Han Wang, Jing Kong","doi":"10.1021/jacs.4c10592","DOIUrl":"https://doi.org/10.1021/jacs.4c10592","url":null,"abstract":"Electrostatic catalysis uses an external electric field (EEF) to rearrange the charge distribution to boost reaction rates and selectively produce certain reaction products in small-molecule reactions (e.g., Diels–Alder addition), requiring a 10 MV/cm field aligned with the reaction axis. Such a large and oriented EEF is challenging for large-scale implementation or material growth with multiple reaction axes or steps. Here, we demonstrate that the energy band at the tip of an individual single-walled carbon nanotube (SWCNT) can be spontaneously shifted in a high-permittivity growth environment, with its other end in contact with a low-work-function electrode (e.g., hafnium carbide). By adjusting the Fermi level at a point where there is a substantial disparity in the density of states (DOS) between semiconducting (s-) and metallic (m-) SWCNTs, we achieve effective electrostatic catalysis for 99.92% purity s-SWCNT growth with a narrow diameter distribution (0.95 ± 0.04 nm), targeting the requirement of advanced SWCNT-based electronics for future computing.","PeriodicalId":49,"journal":{"name":"Journal of the American Chemical Society","volume":"25 1","pages":""},"PeriodicalIF":15.0,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yannick Stöferle, Péter Pál Kalapos, Patrik Willi, Peter Chen
{"title":"Activation of Methyltrioxorhenium for Olefin Metathesis by a Frustrated Lewis Pair","authors":"Yannick Stöferle, Péter Pál Kalapos, Patrik Willi, Peter Chen","doi":"10.1021/jacs.4c12888","DOIUrl":"https://doi.org/10.1021/jacs.4c12888","url":null,"abstract":"Methyltrioxorhenium (MTO) supported on Al<sub>2</sub>O<sub>3</sub> or SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> is an efficient heterogeneous alkene metathesis catalyst that works at room temperature and tolerates various functional groups. Surface studies found that MTO interacts with highly Lewis-acidic aluminum centers and that its methyl group is probably C–H activated resulting in rhenium-methylidene species. The exact structure of the catalyst resting state and the active species is subject to scientific debate. Here, we report on the activation of MTO by 2,6-lutidine and tris(pentafluorophenyl)borane (B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>), a frustrated Lewis pair (FLP) in solution. The MTO/FLP catalyst is active in ring-opening metathesis polymerization of norbornene and in cross-metathesis of internal olefins under mild conditions. ESI-MS and NMR studies found that MTO is deprotonated in the presence of the FLP to yield a rhenium-methylidene species. While this initially activated methylidene eluded detection, spraying reaction mixtures with structurally constrained olefins in ESI-MS allowed for the detection of on-cycle rhenium-alkylidene species. Time-course measurements showed that the modest catalytic activity could be attributed to a rapid catalyst deactivation step. One possible deactivation pathway was identified to be a second deprotonation step of the metathesis-active methylidene, yielding a rhenium-methylidyne. Kinetic experiments have shown that it can be reactivated for olefin metathesis by protonation in solution. Additionally, several irreversible catalyst deactivation pathways leading to permanently deactivated catalyst species are hypothesized. We propose that the MTO/FLP system constitutes a homogeneous model system for the heterogeneous MTO catalysts.","PeriodicalId":49,"journal":{"name":"Journal of the American Chemical Society","volume":"70 1","pages":""},"PeriodicalIF":15.0,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Axial Chlorination Engineering of Single-Atom Nanozyme: Fe-N4Cl Catalytic Sites for Efficient Peroxidase-Mimicking","authors":"Shengjie Wei, Minmin Sun, Juan Huang, Zhengbo Chen, Xijun Wang, Lizeng Gao, Jijie Zhang","doi":"10.1021/jacs.4c13335","DOIUrl":"https://doi.org/10.1021/jacs.4c13335","url":null,"abstract":"Developing axial coordination engineering of single-atom nanozymes (SAzymes), directly regulating the axial coordination environment of the catalytic site, and optimizing the axial adsorption are meaningful and challenging for boosting the enzyme-like activities. Herein, the axial chlorination engineering of SAzyme with the Fe-N<sub>4</sub>Cl catalytic site (Fe-N<sub>4</sub>Cl/CNCl) was first proposed, exhibiting superior peroxidase-like activity compared to the traditional Fe-N<sub>4</sub>/CN SAzyme with Fe-N<sub>4</sub> site. The maximal reaction velocity (4.73 × 10<sup>–5</sup> M min<sup>–1</sup>), the catalytic constant (246.4 min<sup>–1</sup>), and the specific activity (81 U/mg) catalyzed by the Fe-N<sub>4</sub>Cl/CNCl SAzyme were 4.9 times, 3.9 times, and 2.7 times those of the Fe-N<sub>4</sub>/CN SAzyme, revealing the enormous advantages of axial chlorination engineering of SAzymes for remarkably improving enzyme-like activities. Moreover, the Fe-N<sub>4</sub>Cl/CNCl SAzyme also exhibited an enhanced inhibition effect of tumor cell growth in vitro and in vivo. The density functional theory calculation revealed that the Fe-N<sub>4</sub>Cl site was more favorable for releasing <sup>•</sup>OH radical, lowering the energy barrier of rate-determining step, and accelerating the reaction rate compared to the Fe-N<sub>4</sub> site. This work demonstrated the outstanding potential of axial chlorination engineering of SAzymes for improving enzyme-like activities and practical application in tumor therapy.","PeriodicalId":49,"journal":{"name":"Journal of the American Chemical Society","volume":"23 1","pages":""},"PeriodicalIF":15.0,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiaofeng Gao, Cheng Cai, Shuheng Tian, Shiqiang Xu, Lili Lin, Jinan Shi, Chuqiao Song, Tao Wang, Ding Ma, Siyu Yao
{"title":"Performance Descriptor of Subsurface Metal-Promoted Boron Catalysts for Low-Temperature Propane Oxidative Dehydrogenation to Propylene","authors":"Xiaofeng Gao, Cheng Cai, Shuheng Tian, Shiqiang Xu, Lili Lin, Jinan Shi, Chuqiao Song, Tao Wang, Ding Ma, Siyu Yao","doi":"10.1021/jacs.4c11506","DOIUrl":"https://doi.org/10.1021/jacs.4c11506","url":null,"abstract":"Boron-based catalysts have exhibited excellent olefin selectivity in the oxidative dehydrogenation of propane (ODHP) reaction. The substrate material should be a potential platform for performance modulation of boron catalysts in this reaction since the introduction of subsurface Ni promoters significantly improves the activity. In this study, we deciphered the substrate effect and identified a performance descriptor to comprehend the roles of subsurface materials in BO<sub><i>x</i></sub>/metal/BN ODHP catalysts by evaluating different metal promoters. Performance evaluation and transient infrared spectroscopic experiments demonstrate that the intrinsic activity and kinetic behaviors of the O–H bond dissociation/regeneration on the metal-promoted BO<sub><i>x</i></sub> overlayer are metal substrate-dependent. Combining density functional theory (DFT) calculations, it is found that the dissociation/regeneration inclination of the O–H bond in BO<sub><i>x</i></sub>(OH)<sub>3–<i>x</i></sub> active species is controlled by the affinity of H for boron oxide species. The metal-O binding energy, which has been demonstrated to be linearly correlated with H affinity, can serve as a straightforward performance descriptor for both low-temperature radical initialization and ODHP reaction, revealing this reaction is controlled by the Sabatier principle, and moderate metal-O binding energy is essential for achieving remarkable performance in the BO<sub><i>x</i></sub>/M/BN catalysts. Following the guidance of a potential descriptor, Ni–Rh alloy substrates are investigated and the substrate with a Ni/Rh molar ratio of 15:1 significantly enhances the low-temperature intrinsic activity of the metal-modified BO<sub><i>x</i></sub> to 9.26 μmol/(m<sup>2</sup>·s), which reaches 105.9 times that of h-BN and is 18.3% larger than the monometallic BO<sub><i>x</i></sub>/Ni/BN catalysts.","PeriodicalId":49,"journal":{"name":"Journal of the American Chemical Society","volume":"23 1","pages":""},"PeriodicalIF":15.0,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Dynamic Creation of a Local Acid-like Environment for Hydrogen Evolution Reaction in Natural Seawater","authors":"Deyu Bao, Linsen Huang, Yingjie Gao, Kenneth Davey, Yao Zheng, Shi-Zhang Qiao","doi":"10.1021/jacs.4c13036","DOIUrl":"https://doi.org/10.1021/jacs.4c13036","url":null,"abstract":"Electrolysis of natural seawater driven by renewable energy is practically attractive for green hydrogen production. However, because precipitation initiated by an increase in local pH near to the cathode deactivates catalysts or blocks electrolyzer channels, limited catalysts are capable of operating with untreated, natural seawater (<i>viz</i>., pH 8.2 to 8.3 and <i>ca</i>. 35 g salts L<sup>–1</sup>); most are used in strongly alkaline or acidic seawater. Here, we report a new natural seawater electrolysis cathode with precipitation-suppression via a Pt/WO<sub>2</sub> catalyst to create a dynamically local acid-like environment. The <i>in situ</i> formed hydrogen tungsten bronze (H<sub><i>x</i></sub>WO<sub><i>y</i></sub>) phase via continuous hydrogen insertion from water acts as a proton reservoir. As a result, dynamically stored protons create a local acid-like environment near the Pt active sites. We evidence that this tailored acid-like environment boosts the hydrogen evolution reaction in natural seawater splitting and neutralizes generated OH<sup>–</sup> species to restrict precipitation formations. Consequently, a long-term stability of >500 h at 100 mA cm<sup>–2</sup> was exhibited in direct seawater electrolysis.","PeriodicalId":49,"journal":{"name":"Journal of the American Chemical Society","volume":"15 1","pages":""},"PeriodicalIF":15.0,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arad Lang, Celia Chen, Chumei Ye, Lauren N. McHugh, Xian Wei Chua, Samuel D. Stranks, Siân E. Dutton, Thomas D. Bennett
{"title":"Melt Alloying of Two-Dimensional Hybrid Perovskites: Composition-Dependence of Thermal and Optical Properties","authors":"Arad Lang, Celia Chen, Chumei Ye, Lauren N. McHugh, Xian Wei Chua, Samuel D. Stranks, Siân E. Dutton, Thomas D. Bennett","doi":"10.1021/jacs.4c12697","DOIUrl":"https://doi.org/10.1021/jacs.4c12697","url":null,"abstract":"Melt alloying, the process of melting a physical powder blend to create a homogeneous alloy, is widely used in materials processing. By carefully selecting the materials and their proportions, the physical properties of the resulting alloy can be precisely controlled. In this study, we investigate the possibility of utilizing melt alloying principles for meltable two-dimensional hybrid organic–inorganic perovskites (2D-HOIPs). We blend and melt mixtures of two selected 2D-HOIPs: the glass-forming (<i>S</i>-NEA)<sub>2</sub>PbBr<sub>4</sub> (<i>S</i>-NEA = (<i>S</i>)-(−)-1-(1-naphthyl)ethylammonium) and the liquid-forming (1-MHA)<sub>2</sub>PbI<sub>4</sub> (1-MHA = 1-methylhexylammonium). Upon melting and cooling, 1-MHA-poor blends (<i>X</i><sub>1-MHA</sub> ≤ 50% mol, where <i>X</i><sub>1-MHA</sub> corresponds to the relative molar concentration of (1-MHA)<sub>2</sub>PbI<sub>4</sub> in the blend) form a hybrid glass, while 1-MHA-rich blends (<i>X</i><sub>1-MHA</sub> ≥ 70% mol) crystallize. The melting temperature of all blends, as well as the glass transition temperature of the glass-forming blends, change according to blend composition. In all cases, melting produces a homogeneous structure, either glassy or crystalline, which remains such after the glassy samples are recrystallized upon a second heat treatment. This method enables band gap tuning of the blends, given that it varies with composition and crystallinity. Overall, this work demonstrates the applicability of classical melt processing to binary-component functional hybrid systems, and paves the way to solvent-free perovskite-based device fabrication.","PeriodicalId":49,"journal":{"name":"Journal of the American Chemical Society","volume":"4 1","pages":""},"PeriodicalIF":15.0,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}