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ChemInform Abstract: Syntheses, Structure, and Luminescent Properties of Novel Hydrated Rare Earth Borates Ln2B6O10 (OH)4·H2O (Ln: Pr, Nd, Sm, Eu, Gd, Dy, Ho, and Y).

✍ Scribed by Rihong Cong; Tao Yang; Zheming Wang; Junliang Sun; Fuhui Liao; Yingxia Wang; Jianhua Lin

Publisher: John Wiley and Sons
Year: 2011
Weight: 24 KB
Volume: 42
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.201116012

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✦ Synopsis

The novel title compounds are prepared in about 90% yield by hydrothermal reaction of Ln2O3 with stoichiometric amounts of H3BO3 (H2O, 220 °C, autoclave, 3 d). The structures are investigated by powder XRD and single crystal XRD for Nd2B6O10(OH)4•H2O. The isostructural compounds crystallize in the monoclinic space group C2/c with Z = 4. The structure contains cyclic B3O6 anions which share common O atoms to form infinite [B3O5 ] chains, which are interconnected to polyborate layers by hydrogen bonding. Ln2B6O10(OH)4•H2O dehydrates stepwise, giving rise to the new intermediate compounds Ln2B6O10(OH)4 and Ln2B6O11(OH)2. Gd2-2xEu2xB6O10(OH)4•H2O (x = 0.01-1.00) shows highly efficient Eu 3+ f-f transitions and energy transfer from Gd 3+ to Eu 3+ . Eu2B6O10(OH)4•H2O and its two dehydrated products present the strongest emission peak at 620 nm and may be potential red phosphors. -(CONG, R.; YANG,

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