Syntheses, structures, magnetic and thermodynamics properties of tri-spin lanthanide complexes of nitronyl nitroxide

Song, Mei-Ying; Wen, Long-Mei; Wang, Shuping; Yang, Siluo; Zhang, Jianjun; Geng, Lin; Shi, Shikao

doi:10.1016/j.ica.2015.02.018

Cited by 9 publications

(1 citation statement)

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“…In the field of molecular magnetic materials, much more attention has been paid to the assembly of Ln(III)-radical complexes in the recent decade [1][2][3][4][5][6][7][8]. As stable organic radicals, nitronyl nitroxides can act not only as building blocks, but also as spin carriers, so they have played a prominent role in the design and construction of molecular magnetic materials [9][10][11][12]. Due to the rather large and anisotropic magnetic moments of rare-earth metal ions, the magnetic properties of many Ln(III) compounds exhibit very interesting characteristics [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure and Magnetic Property of Novel Ln(III)-Nitronyl Nitroxide Radical Complex

Hou

Fan

Yang

et al. 2016

MSF

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Four novel rare-earth complexes based on a new nitronyl nitroxide radical have been synthesized and characterized as: {[Ln (hfac)3(NITPhBrF)2]·0.5CH2Cl2}(Ln = Sm (1), Gd (2), Tb (3)), {[Ln (hfac)3(NITPhBrF)2]}(Ln = Dy (4)) (hfac = hexafiuoroacetylacetonate; NITPhBrF = 2-(2-fluoro-5-bromophenyl)-tetramethylimidazoline-1-oxyl-3-oxide). The single-crystal X-ray diffraction revealed that compound 1, 2 and 3 are isostructural, which crystallize in the monoclinic space group P21/n, and compound 4 is in the P-1 triclinic space group. These complexes possess mononuclear structure in which the central Ln (III) is octacoordinated by six oxygen atoms from three bidentate hfac ligands and two oxygen atoms from two NITPhBrF ligands. DC magnetic susceptibilities were measured under 1kOe in the 2 - 300 K range. The studies reveal that there exit ferromagnetic interaction between the Gd (III) and radical ligands, and the antiferromagnetic interaction between the two intramolecular radicals in Gd (2). Meanwhile complexes Tb (3) and Dy (4) exhibit antiferromagnetic interactions.

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Section: Introductionmentioning

confidence: 99%

Crystal Structure and Magnetic Property of Novel Ln(III)-Nitronyl Nitroxide Radical Complex

Hou

Fan

Yang

et al. 2016

MSF

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Construction of lanthanide complexes supported by 2,3‐dimethoxybenzoic acid and 5,5’‐dimethy‐2,2’‐bipyridine: crystal structures, thermoanalysis, magnetic and fluorescence properties

Ren

et al. 2019

Applied Organom Chemis

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A series of novel trivalent lanthanide complexes, [Ln(2,3-DMOBA)3(5,5′-DM-2,2′-bipy)]2·C2H5OH (Ln = Eu(1), Sm(2), Gd(3), Ho(4) Er(5), Pr(6), Nd (7)) (2,3-DMOBA = 2,3-dimethoxybenzoate, 5,5′-DM-2,2′-bipy = 5,5′-dimethy-2,2′-bipyridine), have been successfully synthesized and structurally validated by single crystal diffraction. All complexes discussed herein feature a binuclear structure, and contain only one free ethanol molecule, which is interesting in the lanthanide complexes. The coordination number of center Ln3+ ions is nine, showing a distorted monocapped square anti-prismatic coordination geometry. Through a pair of alternating identical C-H···O hydrogen bonding interactions between two 2,3-DMOBA ligands on the same lanthanum binuclear unit with 5,5′-DM-2,2′-bipy ligands on two neighboring units, the binuclear complexes can form one-The thermal analysis of these complexes are investigated by TG-DSC/FTIR, the result show that the decomposition process of complexes are mainly divided into four stages with the formation of the respective oxides.The visible light emission experiment of complex 1 is carried out, and the characteristic luminescence behavior of intense red light is exhibited. What'more, fluorescence lifetimes as well as the fluorescent quantum yield of complex 1 is calculated. And the magnetic properties of complexes 3-5 are also studied.

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Synthesis, structures, thermal behaviour, luminescence and magnetic properties of lanthanide complexes constructed from 2,6‐dimethylbenzoic acid and 5,5′‐dimethyl‐2,2′‐bipyridine

Ren

et al. 2019

Applied Organom Chemis

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Six new lanthanide complexes, with the formula [La(2,6‐DMBA)3(5,5′‐DM‐2,2′‐bipy)(H2O)]2 (1) and [Ln(2,6‐DMBA)3(5,5′‐DM‐2,2′‐bipy)]2 (Ln = Tb(2), Dy(3), Ho(4), Pr(5), Nd(6)) (2,6‐DMBA = 2,6‐dimethylbenzoate, 5,5′‐DM‐2,2′‐bipy = 5,5′‐dimethyl‐2,2′‐bipyridine) have been successfully synthesized and characterized. These title complexes have three different structural types. The structure of complex 1(type I) contains coordination water molecules, and the coordination number is 8. The coordination numbers of complexes 2–4 and 5–6 are 8 and 9, showing a distorted square antiprism geometry and distorted monocapped square anti‐prismatic geometry, respectively. However they have the same general formula and they can be all assembled into the same 1D, 2D supramolecular structures via the C‐H···O hydrogen bonding interactions, which is interesting in previous lanthanide complexes. The complexes were analyzed by TG‐DSC/FTIR. In addition, the visible light luminescence experiments of Tb (III) complex was carried out, and the characteristic luminescence behavior of strong green color was shown. And the fluorescence lifetime and intrinsic quantum yield were calculated. The magnetic properties of complexes 2–4 were also studied, and the results showed that complex 3 and complexes 2, 4 have ferromagnetic interactions and antiferromagnetic interactions, respectively.

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Syntheses, structures, magnetic and thermodynamics properties of tri-spin lanthanide complexes of nitronyl nitroxide

Cited by 9 publications

References 50 publications

Crystal Structure and Magnetic Property of Novel Ln(III)-Nitronyl Nitroxide Radical Complex

Crystal Structure and Magnetic Property of Novel Ln(III)-Nitronyl Nitroxide Radical Complex

Construction of lanthanide complexes supported by 2,3‐dimethoxybenzoic acid and 5,5’‐dimethy‐2,2’‐bipyridine: crystal structures, thermoanalysis, magnetic and fluorescence properties

Synthesis, structures, thermal behaviour, luminescence and magnetic properties of lanthanide complexes constructed from 2,6‐dimethylbenzoic acid and 5,5′‐dimethyl‐2,2′‐bipyridine

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