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Four new rare-earth nitronyl nitroxide radical complexes: Magnetic and luminescent properties.

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Title: Four new rare-earth nitronyl nitroxide radical complexes: Magnetic and luminescent properties.
Authors: Yang, Shuai-Liang1, Wang, Rui-Rui1, Jin, Xiao-Jiao1, Zhang, Chen-Xi1,2 zcx@tust.edu.cn, Wang, Qing-Lun3,4
Source: Polyhedron. Apr2018, Vol. 144, p101-106. 6p.
Subjects: Luminescence, Crystal structure, Fluorine compounds, Analytical chemistry, Heat resistant alloys
Abstract: Four new rare-earth nitronyl nitroxide radical complexes, [Ln(hfac) 3 (NITPh-Pa) 2 ][0.5CH 3 (CH 2 ) 5 CH 3 ] (Ln = Gd( 1 ), Tb( 2 ), Dy( 3 ), Ho( 4 ), hfac = hexafluoroacetylacetonate, NITPh-Pa = 2-(3′,4′-dioxylmethylene-phenyl)-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide), have been synthesized. The X-ray crystal structure analysis revealed that four compounds have similar mononuclear tri-spin structures, in which the Ln(III) ions are eight-coordinated by two nitronyl nitroxide radicals and three hexafluoroacetylacetonate ligands to form a slightly distorted dodecahedron. In complexes 1 – 4 , isolated mononuclear molecules connect each other through intermolecular hydrogen bonds to form 3D supermolecular framework. Magnetic investigation indicates there are ferromagnetic interactions between Gd(III) ions and radicals in complex 1 . Alternating current(ac) magnetic susceptibilities of complexes 2 and 3 show that there are no non-zero out-of-phase signal, which indicates the inexistence of slow magnetic relaxation. The luminescence properties of complex 2 exhibit the characteristic emission peaks of Tb 3+ ions and the potential for recognition of Cr 2 O 7 2− and Cr 3+ ions. Furthermore, nearly linear at low concentration and the low detection limit (0.01 μM) indicate that complex 2 may potentially be acted as luminescence-based sensor for quantitative and highly sensitive detection of Cr 2 O 7 2− ion. [ABSTRACT FROM AUTHOR]
Copyright of Polyhedron is the property of Pergamon Press - An Imprint of Elsevier Science 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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DbLabel: Engineering Source
An: 128394950
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  Data: Four new rare-earth nitronyl nitroxide radical complexes: Magnetic and luminescent properties.
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  Data: <searchLink fieldCode="AR" term="%22Yang%2C+Shuai-Liang%22">Yang, Shuai-Liang</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Rui-Rui%22">Wang, Rui-Rui</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Jin%2C+Xiao-Jiao%22">Jin, Xiao-Jiao</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Chen-Xi%22">Zhang, Chen-Xi</searchLink><relatesTo>1,2</relatesTo><i> zcx@tust.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Qing-Lun%22">Wang, Qing-Lun</searchLink><relatesTo>3,4</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Polyhedron%22">Polyhedron</searchLink>. Apr2018, Vol. 144, p101-106. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Luminescence%22">Luminescence</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+structure%22">Crystal structure</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorine+compounds%22">Fluorine compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+chemistry%22">Analytical chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+resistant+alloys%22">Heat resistant alloys</searchLink>
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  Data: Four new rare-earth nitronyl nitroxide radical complexes, [Ln(hfac) 3 (NITPh-Pa) 2 ][0.5CH 3 (CH 2 ) 5 CH 3 ] (Ln = Gd( 1 ), Tb( 2 ), Dy( 3 ), Ho( 4 ), hfac = hexafluoroacetylacetonate, NITPh-Pa = 2-(3′,4′-dioxylmethylene-phenyl)-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide), have been synthesized. The X-ray crystal structure analysis revealed that four compounds have similar mononuclear tri-spin structures, in which the Ln(III) ions are eight-coordinated by two nitronyl nitroxide radicals and three hexafluoroacetylacetonate ligands to form a slightly distorted dodecahedron. In complexes 1 – 4 , isolated mononuclear molecules connect each other through intermolecular hydrogen bonds to form 3D supermolecular framework. Magnetic investigation indicates there are ferromagnetic interactions between Gd(III) ions and radicals in complex 1 . Alternating current(ac) magnetic susceptibilities of complexes 2 and 3 show that there are no non-zero out-of-phase signal, which indicates the inexistence of slow magnetic relaxation. The luminescence properties of complex 2 exhibit the characteristic emission peaks of Tb 3+ ions and the potential for recognition of Cr 2 O 7 2− and Cr 3+ ions. Furthermore, nearly linear at low concentration and the low detection limit (0.01 μM) indicate that complex 2 may potentially be acted as luminescence-based sensor for quantitative and highly sensitive detection of Cr 2 O 7 2− ion. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Polyhedron is the property of Pergamon Press - An Imprint of Elsevier Science 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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        Text: English
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      – SubjectFull: Fluorine compounds
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            NameFull: Wang, Rui-Rui
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              Text: Apr2018
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              Y: 2018
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