Premium
The Flexibility of P2O7 Dimers in Soft Structures: M2CdP2O7 (M = Rb, Cs)
Author(s) -
Dong Xiaoyu,
Shi Yunjing,
Zhang Mingjie,
Chen Zhaohui,
Jing Qun,
Yang Yun,
Pan Shilie,
Yang Zhihua,
Li Hongyi
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201600086
Subject(s) - chemistry , monoclinic crystal system , orthorhombic crystal system , crystallography , alkali metal , crystallization , melting point , ion , infrared spectroscopy , crystal structure , spectroscopy , diffuse reflectance infrared fourier transform , nuclear magnetic resonance spectroscopy , stereochemistry , physics , organic chemistry , quantum mechanics , biochemistry , photocatalysis , catalysis
Two new congruent‐melting alkali metal diphosphates, Rb 2 CdP 2 O 7 and Cs 2 CdP 2 O 7 , were synthesized by conventional solid‐state reactions. Single‐crystal X‐ray structural analyses showed that M 2 CdP 2 O 7 (M = Rb, Cs) feature two‐dimensional [CdP 2 O 7 ] 2– layers that are composed of CdO 5 pyramids and P 2 O 7 dimers. The Rb + and Cs + cations ions fill the interlayers. The flexible P 2 O 7 dimers could be bent and distorted if the Cs + ion was substituted by the Rb + ion, which led to crystallization of the Rb 2 CdP 2 O 7 compound in the lower symmetry monoclinic space group P 2 1 / c (No. 14) and crystallization of the Cs 2 CdP 2 O 7 compound in the high‐symmetry orthorhombic space group Pnma (No. 53). Thermal analyses showed that the two compounds melt congruently and that the melting point of Rb 2 CdP 2 O 7 compound is lower than that of the Cs 2 CdP 2 O 7 compound owing to distortion of the P 2 O 7 dimers. IR spectroscopy and UV/Vis–near‐IR diffuse reflectance spectroscopy were performed on the reported compounds.