Synthesis and structural characterization of an air and water stable divalent Europium squarate prepared by in situ reduction.
In: Journal of Solid State Chemistry, Jg. 297 (2021-05-01), S. N.PAG
academicJournal
Zugriff:
A new air and water stable divalent Europium squarate, [Eu(C 4 O 4)(H 2 O)] (1), has been prepared and structurally characterized. 1 was synthesized by in situ reduction of a trivalent Europium salt using a Zinc amalgam and mild solvothermal heating. The resulting divalent Europium metal centers in 1 are both air and water stable. This demonstrates that this methodology does not require strict anaerobic conditions. A variation on the synthetic conditions used to prepare 1 (sans the Zinc amalgam) yielded two new series of trivalent lanthanide squarates, [Ln 2 (C 4 O 4) 2 (C 4 O 3 OH) 2 (H 2 O) 12 ] (Ln = La – Nd) (2) and [Ln 2 (C 4 O 4) 3 (H 2 O) 8 ] (Ln = Dy – Lu) (3), which have also been structurally and spectroscopically characterized. Single crystal X-ray diffraction analysis reveals that 1 crystallizes in the C 2 /m space group and is a 3D structure constructed from sheets of EuO 7 (H 2 O) polyhedra with an unusual triangular dodecahedral (CN = 8) geometry, 2 crystallizes in the P 1 ¯ space group and is a 0D structure constructed from LnO 3 (H 2 O) 6 monocapped square antiprismatic (CN = 9) metal centers, and 3 crystallizes in the P 2 1 /n space group and is a 2D sheet structure constructed from LnO 4 (H 2 O) 4 square antiprismatic (CN = 8) metal centers. In all structures, the squarate ligands bind to the metal centers with varying, and sometimes uncommon, coordination modes and denticities. Herein, the synthesis, structure, and solid-state UV–vis–NIR spectroscopy of 1 , 2 , and 3 are presented. [Display omitted] • Aerobic stable Eu2+ squarate compound is prepared using a Zn amalgam • Triangular dodecahedral geometry and μ 8 -octakis(μ 1,1,2,2,3,3,4,4) coordination mode of squarate. • A robust and versatile methodology for preparing other Eu2+ containing materials. [ABSTRACT FROM AUTHOR]
Titel: |
Synthesis and structural characterization of an air and water stable divalent Europium squarate prepared by in situ reduction.
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Autor/in / Beteiligte Person: | Stone, Jason P. ; Decoteau, Elizabeth A. ; Polinski, Matthew J. |
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Zeitschrift: | Journal of Solid State Chemistry, Jg. 297 (2021-05-01), S. N.PAG |
Veröffentlichung: | 2021 |
Medientyp: | academicJournal |
ISSN: | 0022-4596 (print) |
DOI: | 10.1016/j.jssc.2021.122048 |
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