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Wheel-like {Ln6} luminescent lanthanide complexes covering the visible and near-infrared domains.

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Title: Wheel-like {Ln6} luminescent lanthanide complexes covering the visible and near-infrared domains.
Authors: Sun, Ou1 (AUTHOR), Chen, Peng1 (AUTHOR), Li, Hong-Feng1 (AUTHOR), Gao, Ting1 (AUTHOR) gaotingmail@sina.cn, Yan, Peng-Fei1 (AUTHOR) yanpf@vip.sina.com
Source: CrystEngComm. 8/21/2020, Vol. 22 Issue 31, p5200-5206. 7p.
Subjects: Rare earth metals, X-ray powder diffraction, Phosphorimetry, X-ray diffraction
Abstract: The syntheses of pure wheel-like 4f lanthanide complexes are challenging because of the variable and high coordination numbers as well as poor directionality of the lanthanide ions. Therefore, a multifunctional ligand, salicylhydroxamic acid (H3shi), with various coordination sites is deliberately selected for the construction of lanthanide complexes. At the same time, it is found that the ligand can successfully sensitize the lanthanide centers, exhibiting their characteristic emission. A series of wheel-like complexes are synthesized by using metal to ligand stoichiometry (Ln : H3shi : 2-pyca) with a ratio of 1 : 1 : 2, namely, [Ln6(H2shi)6(2-pyca)12(CH3CN)4] ({Ln6}; Ln = Nd, Sm–Er, and Yb). Single-crystal X-ray diffraction shows that the {Eu6} complex is formed as a hexatomic core with dimensions of approximately 18 × 18 × 13 Å. The powder X-ray diffraction analysis demonstrates that all other isolated complexes are isostructural. The analysis of the luminescence properties of these complexes shows typical metal-centered emission bands from the visible (Sm3+, Eu3+, Tb3+ and Dy3+) to near-infrared (Nd3+, Ho3+, Er3+ and Yb3+) ranges. {Sm6} and {Tb6} exhibit orange and bright-green emission in the visible region, respectively. {Eu6} and {Dy6} exhibit co-luminescence of the corresponding Ln3+ ions and the ligands. {Nd6}, {Ho6}, {Er6} and {Yb6} exhibit characteristic sharp emission bands in the NIR range. [ABSTRACT FROM AUTHOR]
Copyright of CrystEngComm 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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  Data: Wheel-like {Ln<subscript>6</subscript>} luminescent lanthanide complexes covering the visible and near-infrared domains.
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  Data: <searchLink fieldCode="AR" term="%22Sun%2C+Ou%22">Sun, Ou</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Peng%22">Chen, Peng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Hong-Feng%22">Li, Hong-Feng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gao%2C+Ting%22">Gao, Ting</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> gaotingmail@sina.cn</i><br /><searchLink fieldCode="AR" term="%22Yan%2C+Peng-Fei%22">Yan, Peng-Fei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> yanpf@vip.sina.com</i>
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  Data: <searchLink fieldCode="JN" term="%22CrystEngComm%22">CrystEngComm</searchLink>. 8/21/2020, Vol. 22 Issue 31, p5200-5206. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Rare+earth+metals%22">Rare earth metals</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+powder+diffraction%22">X-ray powder diffraction</searchLink><br /><searchLink fieldCode="DE" term="%22Phosphorimetry%22">Phosphorimetry</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+diffraction%22">X-ray diffraction</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The syntheses of pure wheel-like 4f lanthanide complexes are challenging because of the variable and high coordination numbers as well as poor directionality of the lanthanide ions. Therefore, a multifunctional ligand, salicylhydroxamic acid (H3shi), with various coordination sites is deliberately selected for the construction of lanthanide complexes. At the same time, it is found that the ligand can successfully sensitize the lanthanide centers, exhibiting their characteristic emission. A series of wheel-like complexes are synthesized by using metal to ligand stoichiometry (Ln : H3shi : 2-pyca) with a ratio of 1 : 1 : 2, namely, [Ln6(H2shi)6(2-pyca)12(CH3CN)4] ({Ln6}; Ln = Nd, Sm–Er, and Yb). Single-crystal X-ray diffraction shows that the {Eu6} complex is formed as a hexatomic core with dimensions of approximately 18 × 18 × 13 Å. The powder X-ray diffraction analysis demonstrates that all other isolated complexes are isostructural. The analysis of the luminescence properties of these complexes shows typical metal-centered emission bands from the visible (Sm3+, Eu3+, Tb3+ and Dy3+) to near-infrared (Nd3+, Ho3+, Er3+ and Yb3+) ranges. {Sm6} and {Tb6} exhibit orange and bright-green emission in the visible region, respectively. {Eu6} and {Dy6} exhibit co-luminescence of the corresponding Ln3+ ions and the ligands. {Nd6}, {Ho6}, {Er6} and {Yb6} exhibit characteristic sharp emission bands in the NIR range. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of CrystEngComm 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/d0ce00652a
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              Text: 8/21/2020
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