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From zero-dimensional to one-dimensional chain N-oxide bridged compounds with enhanced single-molecule magnetic performance.

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Title: From zero-dimensional to one-dimensional chain N-oxide bridged compounds with enhanced single-molecule magnetic performance.
Authors: Zhang, Ling1, Chen, Peng1, Li, Hong-Feng1, Tian, Yong-Mei1, Yan, Peng-Fei1, Sun, Wen-Bin1
Source: Dalton Transactions: An International Journal of Inorganic Chemistry. 4/7/2019, Vol. 48 Issue 13, p4324-4332. 9p.
Subjects: Magnetic measurements, Bridging ligands, Magnetic susceptibility measurement, Activation energy, Magnetic relaxation, X-ray crystallography
Abstract: A series of dinuclear dysprosium complexes bridged by pyridine-NO ligands with formula [Ln2(BTA)6(pyNO)2] (1Dy, Ln = Dy, 1Y, Ln = Y and 1Gd, Ln = Gd) (BTA = benzoyltrifluoroacetone, pyNO = pyridine-N-oxide) were structurally and magnetically characterized. The X-ray crystallographic analyses of the structures revealed that the NO group serves as the effective bridge to link two Dy(iii) centers and the periphery β-diketonate (BTA) ligands complete the rest of the coordination sphere. The dynamic magnetic measurements revealed that complex 1Dy displayed significant zero-field single-molecule magnetic (SMM) behaviour with 72 K energy barrier and 2.5 K hysteresis temperature. In order to extend this dinuclear system, double N-oxide bridged ligand 4,4′-bpdo(4,4′-bipyridine-N,N′-dioxide) was used, and consequently, a series of one-dimensional chain complexes possessing repeated [Ln2(BTA)6(pyNO)2] units were synthesized with formula [Ln2(BTA)6(4,4′-bpdo)]n·2EtOH (2Dy, Ln = Dy, 2Y, Ln = Y and 2Gd, Ln = Gd). The AC magnetic susceptibility measurements revealed that complex 2Dy exhibited significant zero-field slow magnetic relaxation behavior with a higher effective energy barrier of 87 K and a hysteresis temperature of 3 K than 1Dy albeit the separation between the repeated units is large. [ABSTRACT FROM AUTHOR]
Copyright of Dalton Transactions: An International Journal of Inorganic Chemistry is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: From zero-dimensional to one-dimensional chain N-oxide bridged compounds with enhanced single-molecule magnetic performance.
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  Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Ling%22">Zhang, Ling</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Chen%2C+Peng%22">Chen, Peng</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Li%2C+Hong-Feng%22">Li, Hong-Feng</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Tian%2C+Yong-Mei%22">Tian, Yong-Mei</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Yan%2C+Peng-Fei%22">Yan, Peng-Fei</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sun%2C+Wen-Bin%22">Sun, Wen-Bin</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Dalton+Transactions%3A+An+International+Journal+of+Inorganic+Chemistry%22">Dalton Transactions: An International Journal of Inorganic Chemistry</searchLink>. 4/7/2019, Vol. 48 Issue 13, p4324-4332. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Magnetic+measurements%22">Magnetic measurements</searchLink><br /><searchLink fieldCode="DE" term="%22Bridging+ligands%22">Bridging ligands</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+susceptibility+measurement%22">Magnetic susceptibility measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Activation+energy%22">Activation energy</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+relaxation%22">Magnetic relaxation</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+crystallography%22">X-ray crystallography</searchLink>
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  Data: A series of dinuclear dysprosium complexes bridged by pyridine-NO ligands with formula [Ln2(BTA)6(pyNO)2] (1Dy, Ln = Dy, 1Y, Ln = Y and 1Gd, Ln = Gd) (BTA = benzoyltrifluoroacetone, pyNO = pyridine-N-oxide) were structurally and magnetically characterized. The X-ray crystallographic analyses of the structures revealed that the NO group serves as the effective bridge to link two Dy(iii) centers and the periphery β-diketonate (BTA) ligands complete the rest of the coordination sphere. The dynamic magnetic measurements revealed that complex 1Dy displayed significant zero-field single-molecule magnetic (SMM) behaviour with 72 K energy barrier and 2.5 K hysteresis temperature. In order to extend this dinuclear system, double N-oxide bridged ligand 4,4′-bpdo(4,4′-bipyridine-N,N′-dioxide) was used, and consequently, a series of one-dimensional chain complexes possessing repeated [Ln2(BTA)6(pyNO)2] units were synthesized with formula [Ln2(BTA)6(4,4′-bpdo)]n·2EtOH (2Dy, Ln = Dy, 2Y, Ln = Y and 2Gd, Ln = Gd). The AC magnetic susceptibility measurements revealed that complex 2Dy exhibited significant zero-field slow magnetic relaxation behavior with a higher effective energy barrier of 87 K and a hysteresis temperature of 3 K than 1Dy albeit the separation between the repeated units is large. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Dalton Transactions: An International Journal of Inorganic Chemistry is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1039/c9dt00210c
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        Text: English
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      – SubjectFull: Magnetic measurements
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      – SubjectFull: Bridging ligands
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      – SubjectFull: Magnetic susceptibility measurement
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      – SubjectFull: Activation energy
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      – SubjectFull: Magnetic relaxation
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      – SubjectFull: X-ray crystallography
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      – TitleFull: From zero-dimensional to one-dimensional chain N-oxide bridged compounds with enhanced single-molecule magnetic performance.
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            NameFull: Zhang, Ling
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            NameFull: Chen, Peng
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              M: 04
              Text: 4/7/2019
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              Y: 2019
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              Value: 48
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