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Aquacomplexes of rare earth elements demonstrate luminescent properties, suggesting potential applications in materials science.
Aquacomplexes [M(HO)][BH]·15HO (M = Eu, Gd, Yb) and [Ce(HO)][BH]·15HO stabilized by -dodecaborate anion have been synthesized by neutralization of (HO)[BH] solution with rare earth element (REE) oxides MO (M = Eu, Gd, Yb) and CeO and characterized. The structures of [Eu(HO)][BH]·15HO and [Ce(HO)][BH]·15HO have been determined by X-ray diffraction analysis. It was found that the reaction in the CeO/(HO)[BH] system is accompanied by the redox transformation Ce → Ce, while for the MO (M = Eu, Gd, Yb)/(HO)[BH] systems, stabilization of the oxidation state of the corresponding REE has been observed. The luminescent properties of [Ce(HO)][BH]·15HO have been studied. It was shown that this compound emits in the near ultraviolet region with an emission maximum at 370 nm.
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I.I. Myshletsov (2025) studied this question.
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