51
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Schweinfurth D, Sommer MG, Atanasov M, Demeshko S, Hohloch S, Meyer F, Neese F, Sarkar B. The ligand field of the azido ligand: insights into bonding parameters and magnetic anisotropy in a Co(II)-azido complex. J Am Chem Soc 2015; 137:1993-2005. [PMID: 25588991 DOI: 10.1021/ja512232f] [Citation(s) in RCA: 111] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The azido ligand is one of the most investigated ligands in magnetochemistry. Despite its importance, not much is known about the ligand field of the azido ligand and its influence on magnetic anisotropy. Here we present the electronic structure of a novel five-coordinate Co(II)-azido complex (1), which has been characterized experimentally (magnetically and by electronic d-d absorption spectroscopy) and theoretically (by means of multireference electronic structure methods). Static and dynamic magnetic data on 1 have been collected, and the latter demonstrate slow relaxation of the magnetization in an applied external magnetic field of H = 3000 Oe. The zero-field splitting parameters deduced from static susceptibility and magnetizations (D = -10.7 cm(-1), E/D = 0.22) are in excellent agreement with the value of D inferred from an Arrhenius plot of the magnetic relaxation time versus the temperature. Application of the so-called N-electron valence second-order perturbation theory (NEVPT2) resulted in excellent agreement between experimental and computed energies of low-lying d-d transitions. Calculations were performed on 1 and a related four-coordinate Co(II)-azido complex lacking a fifth axial ligand (2). On the basis of these results and contrary to previous suggestions, the N3(-) ligand is shown to behave as a strong σ and π donor. Magnetostructural correlations show a strong increase in the negative D with increasing Lewis basicity (shortening of the Co-N bond distances) of the axial ligand on the N3(-) site. The effect on the change in sign of D in going from four-coordinate Co(II) (positive D) to five-coordinate Co(II) (negative D) is discussed in the light of the bonding scheme derived from ligand field analysis of the ab initio results.
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Affiliation(s)
- David Schweinfurth
- Institut für Chemie und Biochemie, Freie Universität Berlin , Fabeckstraße 34-36, D-14195 Berlin, Germany
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52
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Ke H, Zhang S, Zhu W, Xie G, Chen S. Synthesis, structures, and magnetic properties of four dodecanuclear Ni8RE4 (RE = Gd, Dy, Y) clusters trapping four μ5-bridged carbonate anions. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1004326] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Hongshan Ke
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an, PR China
| | - Sheng Zhang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an, PR China
| | - Wanxia Zhu
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an, PR China
| | - Gang Xie
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an, PR China
| | - Sanping Chen
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an, PR China
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53
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Cao DK, Wei RH, Li XX, Gu YW. Multifunctional mononuclear bisthienylethene-cobalt(ii) complexes: structures, slow magnetic relaxation and photochromic behavior. Dalton Trans 2015; 44:5755-62. [DOI: 10.1039/c4dt04035j] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Based on bisthienylethene ligands BrLH and PLH, multifunctional mononuclear complexes Co(BrL)2·3CH3OH (1) and Co(PL)2·2CH3OH (2) were synthesized, and they exhibited field-induced slow magnetic relaxation behavior and photochromic properties in CH2Cl2–CH3CN solution.
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Affiliation(s)
- Deng-Ke Cao
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Ruo-Hong Wei
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Xiao-Xiong Li
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Yan-Wei Gu
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
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54
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Chen L, Chen SY, Sun YC, Guo YM, Yu L, Chen XT, Wang Z, Ouyang ZW, Song Y, Xue ZL. Slow magnetic relaxation in mononuclear seven-coordinate cobalt(ii) complexes with easy plane anisotropy. Dalton Trans 2015; 44:11482-90. [DOI: 10.1039/c5dt00785b] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two mononuclear pentagonal bipyramid cobalt(ii) complexes with positive zero-field splitting D values were demonstrated to exhibit field-induced slow relaxation behaviour.
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Affiliation(s)
- Lei Chen
- State Key Laboratory of Coordination Chemistry
- Nanjing National Laboratory of Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
| | - Shu-Yang Chen
- State Key Laboratory of Coordination Chemistry
- Nanjing National Laboratory of Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
| | - Yi-Chen Sun
- Wuhan National High Magnetic Field Center
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Yu-Mei Guo
- Wuhan National High Magnetic Field Center
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Lu Yu
- High Magnetic Field Laboratory
- Hefei Institutes of Physical Science
- Chinese Academy of Sciences
- Hefei 230031
- China
| | - Xue-Tai Chen
- State Key Laboratory of Coordination Chemistry
- Nanjing National Laboratory of Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
| | - Zhenxing Wang
- Wuhan National High Magnetic Field Center
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Z. W. Ouyang
- Wuhan National High Magnetic Field Center
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - You Song
- State Key Laboratory of Coordination Chemistry
- Nanjing National Laboratory of Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
| | - Zi-Ling Xue
- Department of Chemistry
- University of Tennessee
- Knoxville
- USA
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55
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Plenk C, Krause J, Rentschler E. A Click-Functionalized Single-Molecule Magnet Based on Cobalt(II) and Its Analogous Manganese(II) and Zinc(II) Compounds. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402955] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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56
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Chen L, Wang J, Liu YZ, Song Y, Chen XT, Zhang YQ, Xue ZL. Slow Magnetic Relaxation in Mononuclear Octahedral Manganese(III) Complexes with Dibenzoylmethanide Ligands. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402964] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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57
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Yoe F, Flores-Alamo M, Morales F, Escudero R, Cortes-Hernández H, Castro M, Barba-Behrens N. Structural, magnetic and theoretical study of mononuclear nickel(II) and cobalt(II) compounds of a benzimidazole thiobutanoic acid derivative. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2014.07.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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58
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Chen L, Wang J, Wei JM, Wernsdorfer W, Chen XT, Zhang YQ, Song Y, Xue ZL. Slow magnetic relaxation in a mononuclear eight-coordinate cobalt(II) complex. J Am Chem Soc 2014; 136:12213-6. [PMID: 25119268 DOI: 10.1021/ja5051605] [Citation(s) in RCA: 140] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The quest for the single-molecular magnets (SMMs) based on mononuclear transition-metal complexes is focused on the low-coordinate species. No transition-metal complex with a coordination number of eight has been shown to exhibit SMM properties. Here the magnetic studies have been carried out for a mononuclear, eight-coordinate cobalt(II)-12-crown-4 (12C4) complex [Co(II)(12C4)2](I3)2(12C4) (1) with a large axial zero-field splitting. Magnetic measurements show field-induced, slow magnetic relaxation under an applied field of 500 Oe at low temperature. The magnetic relaxation time τ was fitted by the Arrhenius model to afford an energy barrier of Ueff = 17.0 cm(-1) and a preexponential factor of τ0 = 1.5 × 10(-6) s. The work here presents the first example of the eight-coordinate, mononuclear, 3d metal complex exhibiting the slow magnetic relaxation.
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Affiliation(s)
- Lei Chen
- State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210093, China
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59
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Singh SK, Gupta T, Badkur P, Rajaraman G. Magnetic anisotropy of mononuclear Ni(II) complexes: on the importance of structural diversity and the structural distortions. Chemistry 2014; 20:10305-13. [PMID: 25042299 DOI: 10.1002/chem.201402694] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Indexed: 11/06/2022]
Abstract
Mononuclear Ni(II) complexes are particularly attractive in the area of single-molecule magnets as the axial zero-field splitting (D) for the Ni(II) complexes is in the range of -200 to +200 cm(-1) . Despite this advantage, very little is known on the origin of anisotropy across various coordination ligands, coordination numbers, and particularly what factors influence the D parameter in these complexes. To answer some of these questions, herein we have undertaken a detailed study of a series of mononuclear Ni(II) complexes with ab initio calculations. Our results demonstrate that three prominent spin-conserved low-lying d-d transitions contribute significantly to the D value. Variation in the sign and the magnitude of D values are found to correlate to the specific structural distortions. Apart from the metal-ligand bond lengths, two different parameters, namely, Δα and Δβ, which are correlated to the cis angles present in the coordination environment, are found to significantly influence the axial D values. Developed magneto-structural D correlations suggest that the D values can be enhanced significantly by fine tuning the structural distortion in the coordination environment. Calculations performed on a series of Ni(II) models with coordination numbers two to six unfold an interesting observation-the D parameter increases significantly upon a reduction in coordination number compared with a reference octahedral coordination. Besides, if high symmetry is maintained, even larger coordination numbers yield large D values.
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Affiliation(s)
- Saurabh Kumar Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai,Mumbai,Maharashtra,India-400 076, Fax: (+91) 22-2576-7152
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60
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Murphy MJ, Usov PM, Rizzuto FJ, Kepert CJ, D'Alessandro DM. Magnetic, electrochemical and optical properties of a sulfate-bridged Co(ii) imidazole dimer. NEW J CHEM 2014. [DOI: 10.1039/c4nj01401d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electrochemical, optical and magnetic properties of a sulfate-bridged high spin Co(ii) dimer, [Co2(DMIM)4(μ2-O2,O,O′-SO4)2]·2MeCN are reported. Antiferromagnetic coupling across the μ2-(O2-sulfato) bridging mode has been identified with J = −28 cm−1.
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Affiliation(s)
| | - Pavel M. Usov
- School of Chemistry
- the University of Sydney
- NSW, Australia
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61
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Gómez-Coca S, Cremades E, Aliaga-Alcalde N, Ruiz E. Huge magnetic anisotropy in a trigonal-pyramidal nickel(II) complex. Inorg Chem 2013; 53:676-8. [PMID: 24359111 DOI: 10.1021/ic402256v] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The work presented herein shows the experimental and theoretical studies of a mononuclear nickel(II) complex with the largest magnetic anisotropy ever reported. The zero-field-splitting D parameter, extracted from the fits of the magnetization and susceptibility measurements, shows a large value of -200 cm(-1), in agreement with the theoretical value of -244 cm(-1) obtained with the CASPT2-RASSI method.
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Affiliation(s)
- Silvia Gómez-Coca
- Departament de Química Inorgànica and Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona , Diagonal 645, E-08028 Barcelona, Spain
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62
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Lamouchi M, Jeanneau E, Novitchi G, Luneau D, Brioude A, Desroches C. Polynuclear Complex Family of Cobalt(II)/Sulfonylcalixarene: One-Pot Synthesis of Cluster Salt [Co14II]+[Co4II]− and Field-Induced Slow Magnetic Relaxation in a Six-Coordinate Dinuclear Cobalt(II)/Sulfonylcalixarene Complex. Inorg Chem 2013; 53:63-72. [DOI: 10.1021/ic4012422] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Meriem Lamouchi
- Laboratoire
des Multimatériaux et Interfaces (UMR 5615), Université Claude Bernard Lyon 1, Campus de La Doua, 69622 Villeurbanne Cedex, France
| | - Erwann Jeanneau
- Laboratoire
des Multimatériaux et Interfaces (UMR 5615), Université Claude Bernard Lyon 1, Campus de La Doua, 69622 Villeurbanne Cedex, France
| | - Ghenadie Novitchi
- Laboratoire
National des Champs Magnétiques Intenses, CNRS, 38042 Grenoble, France
| | - Dominique Luneau
- Laboratoire
des Multimatériaux et Interfaces (UMR 5615), Université Claude Bernard Lyon 1, Campus de La Doua, 69622 Villeurbanne Cedex, France
| | - Arnaud Brioude
- Laboratoire
des Multimatériaux et Interfaces (UMR 5615), Université Claude Bernard Lyon 1, Campus de La Doua, 69622 Villeurbanne Cedex, France
| | - Cédric Desroches
- Laboratoire
des Multimatériaux et Interfaces (UMR 5615), Université Claude Bernard Lyon 1, Campus de La Doua, 69622 Villeurbanne Cedex, France
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63
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Colacio E, Ruiz J, Ruiz E, Cremades E, Krzystek J, Carretta S, Cano J, Guidi T, Wernsdorfer W, Brechin EK. Slow Magnetic Relaxation in a Co
II
–Y
III
Single‐Ion Magnet with Positive Axial Zero‐Field Splitting. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201304386] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Enrique Colacio
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Avda de Fuentenueva s/n, 18071 Granada (Spain)
| | - José Ruiz
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Avda de Fuentenueva s/n, 18071 Granada (Spain)
| | - Eliseo Ruiz
- Departament de Química Inorgànica and Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028 Barcelona (Spain)
| | - Eduard Cremades
- Departament de Química Inorgànica and Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028 Barcelona (Spain)
| | - J. Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310 (USA)
| | - Stefano Carretta
- Dipartimento di Fisica e Scienze della terra, Università de Parma and Unità CNISM di Parma, 43124 Parma (Italy)
| | - Joan Cano
- Instituto de Ciencia Molecular (ICMOL) and Fundació General de la Universitat de València (FGUV), Universitat de València, 46980 Paterna, València (Spain)
| | - Tatiana Guidi
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX (UK)
| | | | - Euan K. Brechin
- EaStCHEM School of Chemistry, The University of Edinburgh, West Mains Road, Edinburgh, EH9 3JJ (UK)
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64
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Colacio E, Ruiz J, Ruiz E, Cremades E, Krzystek J, Carretta S, Cano J, Guidi T, Wernsdorfer W, Brechin EK. Slow Magnetic Relaxation in a CoII-YIIISingle-Ion Magnet with Positive Axial Zero-Field Splitting. Angew Chem Int Ed Engl 2013; 52:9130-4. [DOI: 10.1002/anie.201304386] [Citation(s) in RCA: 249] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Indexed: 11/06/2022]
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65
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Gomez-Coca S, Cremades E, Aliaga-Alcalde N, Ruiz E. Mononuclear Single-Molecule Magnets: Tailoring the Magnetic Anisotropy of First-Row Transition-Metal Complexes. J Am Chem Soc 2013; 135:7010-8. [DOI: 10.1021/ja4015138] [Citation(s) in RCA: 355] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - Núria Aliaga-Alcalde
- ICREA - Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, 08193 Bellaterra, Spain
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