Luminescence properties of heterometallic lanthanide complexes based on lithium β-diketonate bearing tert-butyl and acetal group

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Abstract

Nonsymmetrical lithium β-diketonate (LiL) containing tert-butyl and acetal substituents at the dicarbonyl cage has been synthesized for the first time and is structurally characterized (CIF file CCDC no. 2364039 (I)). The reactions of functional lithium β-diketonate with salts of trivalent rare-earth metals in methanol afford heterobinuclear complexes [(LnL3)(LiL)(MeOH)] (Ln = Eu, Gd, Tb). The structures of the complexes are characterized by X-ray diffraction (XRD) (CIF files CCDC nos. 2364040 (II), 2364041 (III), 2364042 (IV)).

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About the authors

Yu. O. Edilova

Postovskii Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences

Email: dnbazhin@gmail.com
Russian Federation, Yekaterinburg

Yu. S. Kudyakova

Postovskii Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences

Email: dnbazhin@gmail.com
Russian Federation, Yekaterinburg

P. A. Slepukhin

Postovskii Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences; Ural Federal University named after the first President of Russia B.N. Yeltsin

Email: dnbazhin@gmail.com
Russian Federation, Yekaterinburg; Yekaterinburg

M. S. Valova

Postovskii Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences

Email: dnbazhin@gmail.com
Russian Federation, Yekaterinburg

V. I. Saloutin

Postovskii Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences

Email: dnbazhin@gmail.com
Russian Federation, Yekaterinburg

D. N. Bazhin

Postovskii Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences; Ural Federal University named after the first President of Russia B.N. Yeltsin

Author for correspondence.
Email: dnbazhin@gmail.com
Russian Federation, Yekaterinburg; Yekaterinburg

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Supplementary files

Supplementary Files
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2. Scheme 1. Structures of acetal-containing diketonates.

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3. Scheme 2.

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4. Fig. 1. Molecular structure of lithium diketonate tetramer I.

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5. Fig. 2. Structure of lithium diketonate tetramer I, in which the ligand backbone is transparent for ease of perception.

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6. Scheme 3.

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7. Fig. 3. Molecular structure of complexes II–IV.

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8. Fig. 4. Organization of the bimetallic skeleton of compounds II–IV due to diketonate anions with acetal fragments.

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9. Fig. 5. Fragment of the crystal packing of complexes II‒IV. The ligands are transparent to simplify the perception of the arrangement of the heterometallic fragments of the molecules; the dotted line connects the lanthanide ions corresponding to the smallest intermolecular distance Ln…Ln.

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10. Fig. 6. Absorption and PL spectra of solid samples of complexes II and IV.

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11. Fig. 7. Absorption and phosphorescence spectra of microcrystalline samples of non-fluorinated complex III and the trifluoromethyl analogue [(GdLF3)(LiLF)(MeOH)].

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12. Fig. 8. Excitation spectra of solid samples of complexes II and IV.

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