Monoclinic Form of the Rhabdophane Compounds: REEPO4路0.667H2O

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• 作者：Adel Mesbah ; Nicolas Clavier ; Erik Elkaim ; Cl茅mence Gausse ; Ilyes Ben Kacem ; Stephanie Szenknect ; Nicolas Dacheux
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：October 1, 2014
• 年：2014
• 卷：14
• 期：10
• 页码：5090-5098
• 全文大小：603K
• ISSN：1528-7505

文摘

Hydrated rhabdophane with a general formula REEPO₄路nH₂O (REE: La 鈫?Dy) has been always considered to crystallize in the hexagonal system. A recent re-examination of this system by the use of synchrotron powder data of the SmPO₄路0.667 H₂O compound led to a structure crystallizing in the monoclinic C2 space group with a = 28.0903(1) 脜, b = 6.9466(1) 脜, c = 12.0304(1) 脜, 尾 = 115.23(1)掳, and V = 2123.4 (1) 脜³ with 24 formula units per unit cell. The structure consists of infinite channels oriented along the [101] direction and formed by the connection of Sm-polyhedra and P-tetrahedra by sharing O-edges. The water molecules filling the space have been localized for the first time. The monoclinic form of the hydrated rhabdophane was confirmed by studying the series with REE: La 鈫?Dy. Moreover, the dehydration of SmPO₄路0.667H₂O led to the stabilization of an anhydrous form SmPO₄ in the C2 space group with a = 12.14426 (1) 脜, b = 7.01776(1) 脜, c = 6.34755(1) 脜, 尾 = 90.02 (1)掳, V = 540.97(1) 脜³, and Z = 6.