51
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Chen YC, Liu JL, Ungur L, Liu J, Li QW, Wang LF, Ni ZP, Chibotaru LF, Chen XM, Tong ML. Symmetry-Supported Magnetic Blocking at 20 K in Pentagonal Bipyramidal Dy(III) Single-Ion Magnets. J Am Chem Soc 2016; 138:2829-37. [DOI: 10.1021/jacs.5b13584] [Citation(s) in RCA: 631] [Impact Index Per Article: 78.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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52
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Long J, Mamontova E, Freitas V, Luneau D, Vieru V, Chibotaru LF, Ferreira RAS, Félix G, Guari Y, Carlos LD, Larionova J. Study of the influence of magnetic dilution over relaxation processes in a Zn/Dy single-ion magnet by correlation between luminescence and magnetism. RSC Adv 2016. [DOI: 10.1039/c6ra24115h] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
We investigate the magnetic dilution effect on the relaxation mechanisms and the estimation of the energy barrier in a photo-luminescent Dy(iii)/Y(iii) based Single-Ion Magnet (SIM).
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53
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Grindell R, Vieru V, Pugh T, Chibotaru LF, Layfield RA. Magnetic frustration in a hexaazatrinaphthylene-bridged trimetallic dysprosium single-molecule magnet. Dalton Trans 2016; 45:16556-16560. [DOI: 10.1039/c6dt01763k] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The hexaazatrinaphthylene-bridged tri-dysprosium complex [{(thd)3Dy}3HAN] is an SMM that shows two relaxation processes and a frustrated magnetic ground state.
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54
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Liu JL, Wu JY, Huang GZ, Chen YC, Jia JH, Ungur L, Chibotaru LF, Chen XM, Tong ML. Desolvation-Driven 100-Fold Slow-down of Tunneling Relaxation Rate in Co(II)-Dy(III) Single-Molecule Magnets through a Single-Crystal-to-Single-Crystal Process. Sci Rep 2015; 5:16621. [PMID: 26573326 PMCID: PMC4647839 DOI: 10.1038/srep16621] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 10/16/2015] [Indexed: 11/15/2022] Open
Abstract
Single-molecule magnets (SMMs) are regarded as a class of promising materials for spintronic and ultrahigh-density storage devices. Tuning the magnetic dynamics of single-molecule magnets is a crucial challenge for chemists. Lanthanide ions are not only highly magnetically anisotropic but also highly sensitive to the changes in the coordination environments. We developed a feasible approach to understand parts of the magneto-structure correlations and propose to regulate the relaxation behaviors via rational design. A series of Co(II)-Dy(III)-Co(II) complexes were obtained using in situ synthesis; in this system of complexes, the relaxation dynamics can be greatly improved, accompanied with desolvation, via single-crystal to single-crystal transformation. The effective energy barrier can be increased from 293 cm−1 (422 K) to 416 cm−1 (600 K), and the tunneling relaxation time can be grown from 8.5 × 10−4 s to 7.4 × 10−2 s. These remarkable improvements are due to the change in the coordination environments of Dy(III) and Co(II). Ab initio calculations were performed to better understand the magnetic dynamics.
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55
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Aquilante F, Autschbach J, Carlson RK, Chibotaru LF, Delcey MG, De Vico L, Fdez Galván I, Ferré N, Frutos LM, Gagliardi L, Garavelli M, Giussani A, Hoyer CE, Li Manni G, Lischka H, Ma D, Malmqvist PÅ, Müller T, Nenov A, Olivucci M, Pedersen TB, Peng D, Plasser F, Pritchard B, Reiher M, Rivalta I, Schapiro I, Segarra-Martí J, Stenrup M, Truhlar DG, Ungur L, Valentini A, Vancoillie S, Veryazov V, Vysotskiy VP, Weingart O, Zapata F, Lindh R. Molcas 8: New capabilities for multiconfigurational quantum chemical calculations across the periodic table. J Comput Chem 2015; 37:506-41. [PMID: 26561362 DOI: 10.1002/jcc.24221] [Citation(s) in RCA: 1083] [Impact Index Per Article: 120.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 09/07/2015] [Accepted: 09/09/2015] [Indexed: 12/17/2022]
Abstract
In this report, we summarize and describe the recent unique updates and additions to the Molcas quantum chemistry program suite as contained in release version 8. These updates include natural and spin orbitals for studies of magnetic properties, local and linear scaling methods for the Douglas-Kroll-Hess transformation, the generalized active space concept in MCSCF methods, a combination of multiconfigurational wave functions with density functional theory in the MC-PDFT method, additional methods for computation of magnetic properties, methods for diabatization, analytical gradients of state average complete active space SCF in association with density fitting, methods for constrained fragment optimization, large-scale parallel multireference configuration interaction including analytic gradients via the interface to the Columbus package, and approximations of the CASPT2 method to be used for computations of large systems. In addition, the report includes the description of a computational machinery for nonlinear optical spectroscopy through an interface to the QM/MM package Cobramm. Further, a module to run molecular dynamics simulations is added, two surface hopping algorithms are included to enable nonadiabatic calculations, and the DQ method for diabatization is added. Finally, we report on the subject of improvements with respects to alternative file options and parallelization.
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56
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Xue S, Guo Y, Ungur L, Tang J, Chibotaru LF. Tuning the Magnetic Interactions and Relaxation Dynamics of Dy
2
Single‐Molecule Magnets. Chemistry 2015; 21:14099-106. [DOI: 10.1002/chem.201501866] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Indexed: 12/16/2022]
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57
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Li J, Ji M, Schwarz T, Ke X, Van Tendeloo G, Yuan J, Pereira PJ, Huang Y, Zhang G, Feng HL, Yuan YH, Hatano T, Kleiner R, Koelle D, Chibotaru LF, Yamaura K, Wang HB, Wu PH, Takayama-Muromachi E, Vanacken J, Moshchalkov VV. Local destruction of superconductivity by non-magnetic impurities in mesoscopic iron-based superconductors. Nat Commun 2015; 6:7614. [PMID: 26139568 PMCID: PMC4506518 DOI: 10.1038/ncomms8614] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2014] [Accepted: 05/22/2015] [Indexed: 11/09/2022] Open
Abstract
The determination of the pairing symmetry is one of the most crucial issues for the iron-based superconductors, for which various scenarios are discussed controversially. Non-magnetic impurity substitution is one of the most promising approaches to address the issue, because the pair-breaking mechanism from the non-magnetic impurities should be different for various models. Previous substitution experiments demonstrated that the non-magnetic zinc can suppress the superconductivity of various iron-based superconductors. Here we demonstrate the local destruction of superconductivity by non-magnetic zinc impurities in Ba0.5K0.5Fe2As2 by exploring phase-slip phenomena in a mesoscopic structure with 119 × 102 nm(2) cross-section. The impurities suppress superconductivity in a three-dimensional 'Swiss cheese'-like pattern with in-plane and out-of-plane characteristic lengths slightly below ∼1.34 nm. This causes the superconducting order parameter to vary along abundant narrow channels with effective cross-section of a few square nanometres. The local destruction of superconductivity can be related to Cooper pair breaking by non-magnetic impurities.
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58
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Zhang X, Vieru V, Feng X, Liu JL, Zhang Z, Na B, Shi W, Wang BW, Powell AK, Chibotaru LF, Gao S, Cheng P, Long JR. Influence of Guest Exchange on the Magnetization Dynamics of Dilanthanide Single-Molecule-Magnet Nodes within a Metal-Organic Framework. Angew Chem Int Ed Engl 2015; 54:9861-5. [PMID: 26119180 DOI: 10.1002/anie.201503636] [Citation(s) in RCA: 225] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 05/20/2015] [Indexed: 11/11/2022]
Abstract
Multitopic organic linkers can provide a means to organize metal cluster nodes in a regular three-dimensional array. Herein, we show that isonicotinic acid N-oxide (HINO) serves as the linker in the formation of a metal-organic framework featuring Dy2 single-molecule magnets as nodes. Importantly, guest solvent exchange induces a reversible single-crystal to single-crystal transformation between the phases Dy2(INO)4(NO3)2⋅2 solvent (solvent=DMF (Dy2-DMF), CH3CN (Dy2-CH3CN)), thereby switching the effective magnetic relaxation barrier (determined by ac magnetic susceptibility measurements) between a negligible value for Dy2-DMF and 76 cm(-1) for Dy2-CH3CN. Ab initio calculations indicate that this difference arises not from a significant change in the intrinsic relaxation barrier of the Dy2 nodes, but rather from a slowing of the relaxation rate of incoherent quantum tunneling of the magnetization by two orders of magnitude.
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59
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Zhang X, Vieru V, Feng X, Liu J, Zhang Z, Na B, Shi W, Wang B, Powell AK, Chibotaru LF, Gao S, Cheng P, Long JR. Influence of Guest Exchange on the Magnetization Dynamics of Dilanthanide Single‐Molecule‐Magnet Nodes within a Metal–Organic Framework. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503636] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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60
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Chorazy S, Podgajny R, Nogaś W, Buda S, Nitek W, Mlynarski J, Rams M, Kozieł M, Juszyńska Gałązka E, Vieru V, Chibotaru LF, Sieklucka B. Optical Activity and Dehydration-Driven Switching of Magnetic Properties in Enantiopure Cyanido-Bridged CoII3WV2 Trigonal Bipyramids. Inorg Chem 2015; 54:5784-94. [DOI: 10.1021/acs.inorgchem.5b00470] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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61
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Ungur L, Lin SY, Tang J, Chibotaru LF. Single-molecule toroics in Ising-type lanthanide molecular clusters. Chem Soc Rev 2015; 43:6894-905. [PMID: 24975197 DOI: 10.1039/c4cs00095a] [Citation(s) in RCA: 288] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Single-molecule toroics (SMTs) are defined, by analogy with single-molecule magnets, as bistable molecules with a toroidal magnetic state, and seem to be most promising for future applications in quantum computing and information storage and use as multiferroic materials with magnetoelectric effect. As an interdisciplinary research area that spans chemistry, physics and material sciences, synthetic chemists have produced systems suitable for detailed study by physicists and materials scientists, while ab initio calculations have been playing a major role in the detection of toroidal magnetization and the advancement of this field. In this tutorial review, we demonstrate the research developed in the fascinating and challenging field of molecular-based SMTs with particular focus on how recent studies tend to address the issue of toroidal arrangement of the magnetic moment in these systems. Herein, nine typical SMTs are summarized, showing that the assembly of wheel-shaped complexes with the high symmetry of the molecule unit and strong intra-molecular dipolar interactions using strong anisotropy metal ions represents the most promising route toward the design of a toroidal moment. Furthermore, the linkage of such robust toroidal moment units with ferromagnetic type through appropriate bridging ligands enhances the toroidal magnetic moment per unit cell.
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62
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Langley SK, Le C, Ungur L, Moubaraki B, Abrahams BF, Chibotaru LF, Murray KS. Heterometallic 3d–4f Single-Molecule Magnets: Ligand and Metal Ion Influences on the Magnetic Relaxation. Inorg Chem 2015; 54:3631-42. [DOI: 10.1021/acs.inorgchem.5b00219] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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63
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Askevold B, Khusniyarov MM, Kroener W, Gieb K, Müller P, Herdtweck E, Heinemann FW, Diefenbach M, Holthausen MC, Vieru V, Chibotaru LF, Schneider S. Inside Cover: Square-Planar Ruthenium(II) Complexes: Control of Spin State by Pincer Ligand Functionalization (Chem. Eur. J. 2/2015). Chemistry 2015. [DOI: 10.1002/chem.201590001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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64
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Langley SK, Wielechowski DP, Vieru V, Chilton NF, Moubaraki B, Chibotaru LF, Murray KS. The first 4d/4f single-molecule magnet containing a {RuIII2DyIII2} core. Chem Commun (Camb) 2015; 51:2044-7. [DOI: 10.1039/c4cc08811e] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first 4d–4f single-molecule magnet of formula [RuIII2DyIII2(OMe)2(O2CPh)4(mdea)2(NO3)2] shows an anisotropy barrier Ueff of 11 cm−1.
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65
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Huang XC, Vieru V, Chibotaru LF, Wernsdorfer W, Jiang SD, Wang XY. Determination of magnetic anisotropy in a multinuclear TbIII-based single-molecule magnet. Chem Commun (Camb) 2015; 51:10373-6. [DOI: 10.1039/c5cc03089g] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The magnetic anisotropy axis of the Tb3+ ion in a tetranuclear [CuTb]2 SMM was established by magneto-structural relationship investigation.
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66
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Holmberg RJ, Ho LTA, Ungur L, Korobkov I, Chibotaru LF, Murugesu M. Observation of unusual slow-relaxation of the magnetisation in a Gd-EDTA chelate. Dalton Trans 2015; 44:20321-5. [DOI: 10.1039/c5dt04072h] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A Gadolinium EDTA chelate displays characteristic isotropic behaviour common of GdIII complexes under zero applied magnetic field, and anisotropic behaviour arising from dipolar coupling and weak spin–phonon coupling under an applied magnetic field.
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67
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Long J, Rouquette J, Thibaud JM, Ferreira RAS, Carlos LD, Donnadieu B, Vieru V, Chibotaru LF, Konczewicz L, Haines J, Guari Y, Larionova J. A high-temperature molecular ferroelectric Zn/Dy complex exhibiting single-ion-magnet behavior and lanthanide luminescence. Angew Chem Int Ed Engl 2014; 54:2236-40. [PMID: 25556721 DOI: 10.1002/anie.201410523] [Citation(s) in RCA: 193] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Indexed: 11/09/2022]
Abstract
Multifunctional molecular ferroelectrics are exciting materials synthesized using molecular chemistry concepts, which may combine a spontaneous electrical polarization, switched upon applying an electric field, with another physical property. A high-temperature ferroelectric material is presented that is based on a chiral Zn(2+) /Dy(3+) complex exhibiting Dy(3+) luminescence, optical activity, and magnetism. We investigate the correlations between the electric polarization and the crystal structure as well as between the low-temperature magnetic slow relaxation and the optical properties.
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68
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Long J, Rouquette J, Thibaud JM, Ferreira RAS, Carlos LD, Donnadieu B, Vieru V, Chibotaru LF, Konczewicz L, Haines J, Guari Y, Larionova J. A High-Temperature Molecular Ferroelectric Zn/Dy Complex Exhibiting Single-Ion-Magnet Behavior and Lanthanide Luminescence. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201410523] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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69
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Xue S, Ungur L, Guo YN, Tang J, Chibotaru LF. Field-Induced Multiple Relaxation Mechanism of CoIII2DyIII Compound with the Dysprosium Ion in a Low-Symmetrical Environment. Inorg Chem 2014; 53:12658-63. [DOI: 10.1021/ic502443g] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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70
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Askevold B, Khusniyarov MM, Kroener W, Gieb K, Müller P, Herdtweck E, Heinemann FW, Diefenbach M, Holthausen MC, Vieru V, Chibotaru LF, Schneider S. Square-planar ruthenium(II) complexes: control of spin state by pincer ligand functionalization. Chemistry 2014; 21:579-89. [PMID: 25359612 DOI: 10.1002/chem.201404282] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Indexed: 11/07/2022]
Abstract
Functionalization of the PNP pincer ligand backbone allows for a comparison of the dialkyl amido, vinyl alkyl amido, and divinyl amido ruthenium(II) pincer complex series [RuCl{N(CH2 CH2 PtBu2 )2 }], [RuCl{N(CHCHPtBu2 )(CH2 CH2 PtBu2 )}], and [RuCl{N(CHCHPtBu2 )2 }], in which the ruthenium(II) ions are in the extremely rare square-planar coordination geometry. Whereas the dialkylamido complex adopts an electronic singlet (S=0) ground state and energetically low-lying triplet (S=1) state, the vinyl alkyl amido and the divinyl amido complexes exhibit unusual triplet (S=1) ground states as confirmed by experimental and computational examination. However, essentially non-magnetic ground states arise for the two intermediate-spin complexes owing to unusually large zero-field splitting (D>+200 cm(-1) ). The change in ground state electronic configuration is attributed to tailored pincer ligand-to-metal π-donation within the PNP ligand series.
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71
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Liu JL, Wu JY, Chen YC, Mereacre V, Powell AK, Ungur L, Chibotaru LF, Chen XM, Tong ML. Ein heterometallischer FeII-DyIII-Einzelmolekülmagnet mit Rekord-Anisotropiebarriere. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201407799] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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72
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Liu JL, Wu JY, Chen YC, Mereacre V, Powell AK, Ungur L, Chibotaru LF, Chen XM, Tong ML. A Heterometallic FeII-DyIIISingle-Molecule Magnet with a Record Anisotropy Barrier. Angew Chem Int Ed Engl 2014; 53:12966-70. [DOI: 10.1002/anie.201407799] [Citation(s) in RCA: 215] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Indexed: 11/11/2022]
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73
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Zhao FH, Li H, Che YX, Zheng JM, Vieru V, Chibotaru LF, Grandjean F, Long GJ. Synthesis, Structure, and Magnetic Properties of Dy2Co2L10(bipy)2 and Ln2Ni2L10(bipy)2, Ln = La, Gd, Tb, Dy, and Ho: Slow Magnetic Relaxation in Dy2Co2L10(bipy)2 and Dy2Ni2L10(bipy)2. Inorg Chem 2014; 53:9785-99. [DOI: 10.1021/ic501374q] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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74
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Samuel PP, Mondal KC, Amin Sk N, Roesky HW, Carl E, Neufeld R, Stalke D, Demeshko S, Meyer F, Ungur L, Chibotaru LF, Christian J, Ramachandran V, van Tol J, Dalal NS. Electronic Structure and Slow Magnetic Relaxation of Low-Coordinate Cyclic Alkyl(amino) Carbene Stabilized Iron(I) Complexes. J Am Chem Soc 2014; 136:11964-71. [DOI: 10.1021/ja5043116] [Citation(s) in RCA: 127] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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75
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Le Roy JJ, Ungur L, Korobkov I, Chibotaru LF, Murugesu M. Coupling Strategies to Enhance Single-Molecule Magnet Properties of Erbium–Cyclooctatetraenyl Complexes. J Am Chem Soc 2014; 136:8003-10. [DOI: 10.1021/ja5022552] [Citation(s) in RCA: 236] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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