(BMI)3LnCl6 Crystals as Models for the Coordination Environment of LnCl3 (Ln = Sm, Eu, Dy, Er, Yb) in 1-Butyl-3-methylimidazolium Chloride Ionic-Liquid Solution

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• 作者：Yulun Han ; Cuikun Lin ; Qingguo Meng ; Fengrong Dai ; Andrew G. Sykes ; Mary T. Berry ; P. Stanley May
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：June 2, 2014
• 年：2014
• 卷：53
• 期：11
• 页码：5494-5501
• 全文大小：439K
• 年卷期：v.53,no.11(June 2, 2014)
• ISSN：1520-510X

文摘

A series of (BMI)₃LnCl₆ (Ln = Sm, Eu, Dy, Er, Yb) crystals was prepared from solutions of LnCl₃ dissolved in the ionic liquid, 1-butyl-3-methylimidazolium chloride (BMICl). Crystals with Ln = 5% Sm + 95% Gd and with Ln = 5% Dy + 95% Gd were also grown to assess the importance of cross-relaxation in the Sm and Dy samples. The crystals are isostructural, with monoclinic space group P2₁/c and four formula units per unit cell. The first coordination sphere of Ln³⁺ consists of six Cl^{鈥?/sup> anions forming a slightly distorted octahedral LnCl₆3鈥?/sup> center. The second coordination sphere is composed of nine BMI+ cations. The emission spectra and luminescence lifetimes of both (BMI)₃LnCl₆ crystals and LnCl₃ in BMICl solution were measured. The spectroscopic similarities suggest that crystalline (BMI)₃LnCl₆ provides a good model of the Ln3+ coordination environment in BMICl solution.}