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Yang W, Rosenkranz M, Velkos G, Ziegs F, Dubrovin V, Schiemenz S, Spree L, de Souza Barbosa MF, Guillemard C, Valvidares M, Büchner B, Liu F, Avdoshenko SM, Popov AA. Covalency versus magnetic axiality in Nd molecular magnets: Nd-photoluminescence, strong ligand-field, and unprecedented nephelauxetic effect in fullerenes NdM 2N@C 80 (M = Sc, Lu, Y). Chem Sci 2024; 15:2141-2157. [PMID: 38332818 PMCID: PMC10848757 DOI: 10.1039/d3sc05146c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 12/20/2023] [Indexed: 02/10/2024] Open
Abstract
Nd-based nitride clusterfullerenes NdM2N@C80 with rare-earth metals of different sizes (M = Sc, Y, Lu) were synthesized to elucidate the influence of the cluster composition, shape and internal strain on the structural and magnetic properties. Single crystal X-ray diffraction revealed a very short Nd-N bond length in NdSc2N@C80. For Lu and Y analogs, the further shortening of the Nd-N bond and pyramidalization of the NdM2N cluster are predicted by DFT calculations as a result of the increased cluster size and a strain caused by the limited size of the fullerene cage. The short distance between Nd and nitride ions leads to a very large ligand-field splitting of Nd3+ of 1100-1200 cm-1, while the variation of the NdM2N cluster composition and concomitant internal strain results in the noticeable modulation of the splitting, which could be directly assessed from the well-resolved fine structure in the Nd-based photoluminescence spectra of NdM2N@C80 clusterfullerenes. Photoluminescence measurements also revealed an unprecedentedly strong nephelauxetic effect, pointing to a high degree of covalency. The latter appears detrimental to the magnetic axiality despite the strong ligand field. As a result, the ground magnetic state has considerable transversal components of the pseudospin g-tensor, and the slow magnetic relaxation of NdSc2N@C80 could be observed by AC magnetometry only in the presence of a magnetic field. A combination of the well-resolved magneto-optical states and slow relaxation of magnetization suggests that Nd clusterfullerenes can be useful building blocks for magneto-photonic quantum technologies.
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Affiliation(s)
- Wei Yang
- Leibniz Institute for Solid State and Materials Research (IFW Dresden) 01069 Dresden Germany
| | - Marco Rosenkranz
- Leibniz Institute for Solid State and Materials Research (IFW Dresden) 01069 Dresden Germany
| | - Georgios Velkos
- Leibniz Institute for Solid State and Materials Research (IFW Dresden) 01069 Dresden Germany
| | - Frank Ziegs
- Leibniz Institute for Solid State and Materials Research (IFW Dresden) 01069 Dresden Germany
| | - Vasilii Dubrovin
- Leibniz Institute for Solid State and Materials Research (IFW Dresden) 01069 Dresden Germany
| | - Sandra Schiemenz
- Leibniz Institute for Solid State and Materials Research (IFW Dresden) 01069 Dresden Germany
| | - Lukas Spree
- Leibniz Institute for Solid State and Materials Research (IFW Dresden) 01069 Dresden Germany
- Center for Quantum Nanoscience, Institute for Basic Science (IBS) Seoul Republic of Korea
| | | | | | | | - Bernd Büchner
- Leibniz Institute for Solid State and Materials Research (IFW Dresden) 01069 Dresden Germany
| | - Fupin Liu
- Leibniz Institute for Solid State and Materials Research (IFW Dresden) 01069 Dresden Germany
| | - Stanislav M Avdoshenko
- Leibniz Institute for Solid State and Materials Research (IFW Dresden) 01069 Dresden Germany
| | - Alexey A Popov
- Leibniz Institute for Solid State and Materials Research (IFW Dresden) 01069 Dresden Germany
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Jin H, Xin J, Xiang W, Jiang Z, Han X, Chen M, Du P, Yao YR, Yang S. Bandgap Engineering of Erbium-Metallofullerenes toward Switchable Photoluminescence. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2304121. [PMID: 37805835 DOI: 10.1002/adma.202304121] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 09/07/2023] [Indexed: 10/09/2023]
Abstract
Encapsulating photoluminescent lanthanide ions like erbium (Er) into fullerene cages affords photoluminescent endohedral metallofullerenes (EMFs). Few reported photoluminescent Er-EMFs are all based on encapsulation of multiple (two to three) metal atoms, whereas mono-Er-EMFs exemplified by Er@C82 are not photoluminescent due to its narrow optical bandgap. Herein, by entrapping an Er-cyanide cluster into various C82 cages to form novel Er-monometallic cyanide clusterfullerenes (CYCFs), ErCN@C82 (C2 (5), Cs (6), and C2 v (9)), the photoluminescent properties of CYCFs are investigated, and obvious near-infrared (NIR) photoluminescence only is observed for ErCN@C2 (5)-C82 . Combined with a comparative photoluminescence study of three medium-bandgap di-Er-EMFs, including Er2 @Cs (6)-C82 , Er2 O@Cs (6)-C82 , and Er2 C2 @Cs (6)-C82 , this study proposes that the optical bandgap can be used as a simple criterion for switching the photoluminescence of Er-EMFs, and the bandgap threshold is determined to be between 0.83 and 0.74 eV. Furthermore, the photoluminescent patterns of these three di-Er-EMFs differ dramatically. It is found that the location of the Er atom within the same Cs (6)-C82 cage is almost fixed and independent on the endo-unit; thus the previous statement on the key role of metal position in photoluminescence of di-Er-EMFs seems erroneous, and the geometric configuration of the endo-unit, especially the bridging mode of two Er ions, is decisive instead.
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Affiliation(s)
- Huaimin Jin
- Key Laboratory of Precision and Intelligent Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Jinpeng Xin
- Key Laboratory of Precision and Intelligent Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Wenhao Xiang
- Key Laboratory of Precision and Intelligent Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Zhanxin Jiang
- Key Laboratory of Precision and Intelligent Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Xinyi Han
- Key Laboratory of Precision and Intelligent Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Muqing Chen
- Key Laboratory of Precision and Intelligent Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Pingwu Du
- Key Laboratory of Precision and Intelligent Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Yang-Rong Yao
- Key Laboratory of Precision and Intelligent Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Shangfeng Yang
- Key Laboratory of Precision and Intelligent Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
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3
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Liang J, Lu Y, Zhang J, Qiu L, Li W, Zhang Z, Wang C, Wang T. Visible and near-infrared photoluminescence of a supramolecular complex constructed from a cycloparaphenylene nanoring and an erbium metallofullerene. Dalton Trans 2022; 51:10227-10233. [PMID: 35748358 DOI: 10.1039/d2dt00983h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Erbium metallofullerenes exhibit near-infrared photoluminescence from the Er3+ ions, which has potential applications in telecommunications, optical devices and bioscience. In this manuscript, we report the construction of a supramolecular complex of metallofullerene Er3N@C80 and cycloparaphenylene [12]CPP to adjust the near-infrared photoluminescence of Er3N@C80 through host-guest interactions. Moreover, this supramolecular complex shows a multiwavelength luminescence property. Mass spectrometry, electrochemical measurements and proton NMR spectroscopy were used to characterize the structure of Er3N@C80⊂[12]CPP. The electrochemical results of Er3N@C80⊂[12]CPP show the negatively shifted redox potentials compared to pristine Er3N@C80 and the 1H NMR signals of Er3N@C80⊂[12]CPP shift upfield compared to pristine [12]CPP. More importantly, the photoluminescence spectra show that the [12]CPP nanoring can affect the near-infrared emission of encapsulated Er3+ ions in Er3N@C80, with the characteristic emission peak of Er3+ at 1.5 μm being broadened and enhanced in the Er3N@C80⊂[12]CPP complex, while the fluorescence lifetime of Er3+ also becomes longer after assembly formation. Furthermore, the Er3N@C80 guest also can influence the photoluminescence property of [12]CPP, whose emission peaks exhibit a slight blue-shift in the Er3N@C80⊂[12]CPP complex. This study illustrates that the outer nanoring can be employed to adjust the photoluminescence of the encapsulated Er3+ ion in Er3N@C80.
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Affiliation(s)
- Jiayi Liang
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Taiyuan 030024, China. .,Beijing National Laboratory for Molecular Sciences, Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun North First Street 2, Beijing 100190, China.
| | - Yuxi Lu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun North First Street 2, Beijing 100190, China. .,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jie Zhang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun North First Street 2, Beijing 100190, China. .,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ling Qiu
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Taiyuan 030024, China. .,Beijing National Laboratory for Molecular Sciences, Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun North First Street 2, Beijing 100190, China.
| | - Wang Li
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun North First Street 2, Beijing 100190, China. .,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhuxia Zhang
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Taiyuan 030024, China.
| | - Chunru Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun North First Street 2, Beijing 100190, China.
| | - Taishan Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun North First Street 2, Beijing 100190, China.
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4
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Zalibera M, Ziegs F, Schiemenz S, Dubrovin V, Lubitz W, Savitsky A, Deng SHM, Wang XB, Avdoshenko SM, Popov AA. Metallofullerene photoswitches driven by photoinduced fullerene-to-metal electron transfer. Chem Sci 2021; 12:7818-7838. [PMID: 34168836 PMCID: PMC8188499 DOI: 10.1039/d0sc07045a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report on the discovery and detailed exploration of the unconventional photo-switching mechanism in metallofullerenes, in which the energy of the photon absorbed by the carbon cage π-system is transformed to mechanical motion of the endohedral cluster accompanied by accumulation of spin density on the metal atoms. Comprehensive photophysical and electron paramagnetic resonance (EPR) studies augmented by theoretical modelling are performed to address the phenomenon of the light-induced photo-switching and triplet state spin dynamics in a series of Y x Sc3-x N@C80 (x = 0-3) nitride clusterfullerenes. Variable temperature and time-resolved photoluminescence studies revealed a strong dependence of their photophysical properties on the number of Sc atoms in the cluster. All molecules in the series exhibit temperature-dependent luminescence assigned to the near-infrared thermally-activated delayed fluorescence (TADF) and phosphorescence. The emission wavelengths and Stokes shift increase systematically with the number of Sc atoms in the endohedral cluster, whereas the triplet state lifetime and S1-T1 gap decrease in this row. For Sc3N@C80, we also applied photoelectron spectroscopy to obtain the triplet state energy as well as the electron affinity. Spin distribution and dynamics in the triplet states are then studied by light-induced pulsed EPR and ENDOR spectroscopies. The spin-lattice relaxation times and triplet state lifetimes are determined from the temporal evolution of the electron spin echo after the laser pulse. Well resolved ENDOR spectra of triplets with a rich structure caused by the hyperfine and quadrupolar interactions with 14N, 45Sc, and 89Y nuclear spins are obtained. The systematic increase of the metal contribution to the triplet spin density from Y3N to Sc3N found in the ENDOR study points to a substantial fullerene-to-metal charge transfer in the excited state. These experimental results are rationalized with the help of ground-state and time-dependent DFT calculations, which revealed a substantial variation of the endohedral cluster position in the photoexcited states driven by the predisposition of Sc atoms to maximize their spin population.
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Affiliation(s)
- Michal Zalibera
- Institute of Physical Chemistry and Chemical Physics, Slovak University of Technology in Bratislava Radlinského 9 81237 Bratislava Slovakia .,Max Planck Institute for Chemical Energy Conversion Mülheim (Ruhr) Germany
| | - Frank Ziegs
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
| | - Sandra Schiemenz
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
| | - Vasilii Dubrovin
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
| | - Wolfgang Lubitz
- Max Planck Institute for Chemical Energy Conversion Mülheim (Ruhr) Germany
| | - Anton Savitsky
- Max Planck Institute for Chemical Energy Conversion Mülheim (Ruhr) Germany.,Faculty of Physics, Technical University Dortmund Otto-Hahn-Str. 4a 44227 Dortmund Germany
| | - Shihu H M Deng
- Physical Sciences Division, Pacific Northwest National Laboratory Richland Washington 99352 USA
| | - Xue-Bin Wang
- Physical Sciences Division, Pacific Northwest National Laboratory Richland Washington 99352 USA
| | - Stanislav M Avdoshenko
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
| | - Alexey A Popov
- Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20 01069 Dresden Germany
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5
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Yang S, Wei T, Jin F. When metal clusters meet carbon cages: endohedral clusterfullerenes. Chem Soc Rev 2018; 46:5005-5058. [PMID: 28681052 DOI: 10.1039/c6cs00498a] [Citation(s) in RCA: 185] [Impact Index Per Article: 30.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Fullerenes have the characteristic of a hollow interior, and this unique feature triggers intuitive inspiration to entrap atoms, ions or clusters inside the carbon cage in the form of endohedral fullerenes. In particular, upon entrapping an otherwise unstable metal cluster into a carbon cage, the so-called endohedral clusterfullerenes fulfil the mutual stabilization of the inner metal cluster and the outer fullerene cage with a specific isomeric structure which is often unstable as an empty fullerene. A variety of metal clusters have been reported to form endohedral clusterfullerenes, including metal nitrides, carbides, oxides, sulfides, cyanides and so on, making endohedral clusterfullerenes the most variable and intriguing branch of endohedral fullerenes. In this review article, we present an exhaustive review on all types of endohedral clusterfullerenes reported to date, including their discoveries, syntheses, separations, molecular structures and properties as well as their potential applications in versatile fields such as biomedicine, energy conversion, and so on. At the end, we present an outlook on the prospect of endohedral clusterfullerenes.
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Affiliation(s)
- Shangfeng Yang
- Hefei National Laboratory for Physical Sciences at Microscale, Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences, Department of Materials Science and Engineering, Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China (USTC), Hefei 230026, China.
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6
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Zhao C, Wang T, Li Y, Meng H, Nie M, Tian J, Wang C. Awaking N-hyperfine couplings in charged yttrium nitride endohedral fullerenes. Phys Chem Chem Phys 2017; 19:26846-26850. [DOI: 10.1039/c7cp05444k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Charged yttrium nitride endohedral fullerenes show particular N-hyperfine couplings that are sensitive to the outer carbon cage.
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Affiliation(s)
- Chong Zhao
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Sciences
- 100190 Beijing
| | - Taishan Wang
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Sciences
- 100190 Beijing
| | - Yongjian Li
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Sciences
- 100190 Beijing
| | - Haibing Meng
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Sciences
- 100190 Beijing
| | - Mingzhe Nie
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Sciences
- 100190 Beijing
| | - Jianlei Tian
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Sciences
- 100190 Beijing
| | - Chunru Wang
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Molecular Nanostructure and Nanotechnology
- Institute of Chemistry
- Chinese Academy of Sciences
- 100190 Beijing
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7
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Zhao J, Huang X, Jin P, Chen Z. Magnetic properties of atomic clusters and endohedral metallofullerenes. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.12.013] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Wang T, Wang C. Endohedral metallofullerenes based on spherical I(h)-C(80) cage: molecular structures and paramagnetic properties. Acc Chem Res 2014; 47:450-8. [PMID: 24328037 DOI: 10.1021/ar400156z] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Fullerenes are carbon cages assembled from fused hexagons andpentagons that have closed networks and conjugated π systems. The curve of the fullerene structure requires that the constituent carbon atoms take on a pyramidal shape and produces extra strain energy. However, the highly symmetrical geometry of the fullerene decreases the surface tension in these structures, so highly symmetrical fullerenes are usually very stable. For example, C60 with icosahedral symmetry (Ih) is the most stable fullerene molecule. However, another highly symmetrical fullerene, Ih-C80, is extremely unstable. The reason for this difference is the open-shell electronic structure of Ih-C80, which has a 4-fold degenerate HOMO occupied by only two electrons. Predictably, once the degenerate HOMO of Ih-C80 accepts six more electrons, it forms a closed-shell electronic structure similar to Ih-C60 and with comparable stability. Because the hollow structure of fullerenes can encapsulate metal atoms and those internal metals can transfer electrons to the fullerene cage, the encapsulation of metal clusters may provide an ideal technique for the stabilization of the Ih-C80 fullerenes. In this Account, we focus on the molecular structures and paramagnetic properties of spherical Ih-C80 endohedral fullerenes encaging a variety of metal moieties, such as metal atoms (Mn), metal nitride (M3N), metal carbide (MnC2), metal carbonitride (M3CN), and metal oxides (M4Om). We introduce several types of endohedral metallofullerenes such as Sc4C2@Ih-C80, which exhibits a Russian-doll-like structure, and Sc3CN@Ih-C80, which encapsulates a planar metal carbonitride cluster. In addition, we emphasize the paramagnetic properties of Ih-C80-based metallofullerenes, such as Sc3C2@Ih-C80, Y2@C79N, and M3N@Ih-C80, to show how those spin-active species can present a controllable paramagnetism. This Account highlights an inspiring molecular world within the spherical Ih-C80 cages of various metallofullerenes.
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Affiliation(s)
- Taishan Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
| | - Chunru Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
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9
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Lebedeva MA, Chamberlain TW, Davies ES, Mancel D, Thomas BE, Suyetin M, Bichoutskaia E, Schröder M, Khlobystov AN. Transition Metal Complexes of a Salen-Fullerene Diad: Redox and Catalytically Active Nanostructures for Delivery of Metals in Nanotubes. Chemistry 2013; 19:11999-2008. [DOI: 10.1002/chem.201300872] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Indexed: 11/10/2022]
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10
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Affiliation(s)
- Alexey A Popov
- Department of Electrochemistry and Conducting Polymers, Leibniz-Institute for Solid State and Materials Research (IFW) Dresden , D-01171 Dresden, Germany
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11
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Štěpánek P, Straka M, Andrushchenko V, Bouř P. Communication: Fullerene resolution by the magnetic circular dichroism. J Chem Phys 2013; 138:151103. [DOI: 10.1063/1.4802763] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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12
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Stevenson S, Rose CB, Maslenikova JS, Villarreal JR, Mackey MA, Mercado BQ, Chen K, Olmstead MM, Balch AL. Selective Synthesis, Isolation, and Crystallographic Characterization of LaSc2N@Ih-C80. Inorg Chem 2012; 51:13096-102. [DOI: 10.1021/ic300888e] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Steven Stevenson
- Department
of Chemistry, Indiana Purdue University at Fort Wayne (IPFW), 2101
E. Coliseum Blvd., Fort Wayne, Indiana 46805, United States
| | - Coralie B. Rose
- Department
of Chemistry, Indiana Purdue University at Fort Wayne (IPFW), 2101
E. Coliseum Blvd., Fort Wayne, Indiana 46805, United States
| | - Juliya S. Maslenikova
- Department of Chemistry and
Biochemistry, University of Southern Mississippi, 118 College Drive, #5043, Hattiesburg, Mississippi 39406, United
States
| | - Jimmy R. Villarreal
- Department of Chemistry and
Biochemistry, University of Southern Mississippi, 118 College Drive, #5043, Hattiesburg, Mississippi 39406, United
States
| | - Mary A. Mackey
- Department of Chemistry and
Biochemistry, University of Southern Mississippi, 118 College Drive, #5043, Hattiesburg, Mississippi 39406, United
States
| | - Brandon Q. Mercado
- Department of Chemistry, University of California, One Shields Avenue, Davis,
California 05616, United States
| | - Kelly Chen
- Department of Chemistry, University of California, One Shields Avenue, Davis,
California 05616, United States
| | - Marilyn M. Olmstead
- Department of Chemistry, University of California, One Shields Avenue, Davis,
California 05616, United States
| | - Alan L. Balch
- Department of Chemistry, University of California, One Shields Avenue, Davis,
California 05616, United States
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13
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Huang T, Zhao J, Feng M, Popov AA, Yang S, Dunsch L, Petek H. A multi-state single-molecule switch actuated by rotation of an encapsulated cluster within a fullerene cage. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.09.064] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Zhang Y, Popov AA, Schiemenz S, Dunsch L. Synthesis, isolation, and spectroscopic characterization of holmium-based mixed-metal nitride clusterfullerenes: HoxSc3-xN@C80 (x=1, 2). Chemistry 2012; 18:9691-8. [PMID: 22745152 DOI: 10.1002/chem.201200574] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Revised: 04/09/2012] [Indexed: 11/06/2022]
Abstract
The synthesis, isolation and spectroscopic characterization of holmium-based mixed metal nitride clusterfullerenes Ho(x) Sc(3-x) N@C(80) (x=1, 2) are reported. Two isomers of Ho(x) Sc(3-x) N@C(80) (x=1, 2) were synthesized by the reactive gas atmosphere method and isolated by multistep recycling HPLC. The isomeric structures of Ho(x) Sc(3-x) N@C(80) (x=1, 2) were characterized by laser-desorption time-of-flight (LD-TOF) mass spectrometry and UV/Vis/NIR, FTIR and Raman spectroscopy. A comparative study of M(x) Sc(3-x) N@C(80) (M=Gd, Dy, Lu, Ho) demonstrates the dependence of their electronic and vibrational properties on the encaged metal. Despite the distinct perturbation induced by 4f(10) electrons, we report the first paramagnetic (13) C NMR study on Ho(x) Sc(3-x) N@C(80) (I; x=1, 2) and confirm I(h) -symmetric cage structure. A (45) Sc NMR study on HoSc(2) N@C(80) (I, II) revealed a temperature-dependent chemical shift in the temperature range of 268-308 K.
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Affiliation(s)
- Yang Zhang
- Group of Electrochemistry and Conducting Polymers, Leibniz-Institute for Solid State and Materials Research (IFW) Dresden, 101171 Dresden, Germany
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15
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Fiasconaro A, Spagnolo B. Stability measures in metastable states with Gaussian colored noise. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2009; 80:041110. [PMID: 19905276 DOI: 10.1103/physreve.80.041110] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2009] [Revised: 08/23/2009] [Indexed: 05/28/2023]
Abstract
We present a study of the escape time from a metastable state of an overdamped Brownian particle in the presence of colored noise generated by Ornstein-Uhlenbeck process. We analyze the role of the correlation time on the enhancement of the mean first passage time through a potential barrier and on the behavior of the mean growth rate coefficient as a function of the noise intensity. We observe the noise-enhanced stability effect for all the initial unstable states used and for all values of the correlation time tau(c) investigated. We can distinguish two dynamical regimes characterized by weak and strong correlated noises, depending on the value of tau(c) with respect to the relaxation time of the system.
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Affiliation(s)
- Alessandro Fiasconaro
- Dipartimento di Fisica e Tecnologie Relative, Group of Interdisciplinary Physics, Università di Palermo and CNISM-INFM, Viale delle Scienze, I-90128 Palermo, Italy.
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Plant SR, Dantelle G, Ito Y, Ng TC, Ardavan A, Shinohara H, Taylor RA, Briggs GAD, Porfyrakis K. Acuminated fluorescence of Er3+ centres in endohedral fullerenes through the incarceration of a carbide cluster. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.05.042] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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