Two new acidic diphosphates Rb2M(H2P2O7)2•2H2O (M=Zn and Mg): Crystal structures and vibrational study

被引：8
|
作者：
Essehli, Rachid [1 ]
El Bali, Brahim [1 ]
Lachkar, Mohammed [2 ]
Cruciani, Giuseppe [3 ]
机构：
[1] Univ Mohamed I, Fac Sci, Dept Chem, Lab Mineral Solid & Analyt Chem, Oujda 60000, Morocco
[2] Univ Sidi Mohamed Ben Abdellah, Fac Sci, Lab Ingn Mat Organometall & Mol, Atlas, Fes, Morocco
[3] Univ Ferrara, Fac Sci, Dept Earth Sci, I-44100 Ferrara, Italy
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 492卷 / 1-2期
关键词：
Acidic diphosphates; X-ray diffraction; Crystal structure; IR and micro-Raman spectroscopies; PYROPHOSPHATE; PHOSPHATE;
D O I：
10.1016/j.jallcom.2009.11.095
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Two new complex diphosphates Rb2M(H2P2O7)(2)center dot 2H(2)O [M = Zn (I), Mg (II)], have been synthesized using wet chemistry. Their crystals have been isolated and characterized by X-ray diffraction, FTIR and micro-Raman techniques. Both compounds crystallize in the triclinic system, S.G. P-1, Z= 1 and following parameters (A,degrees), [6.9573(1), 7.3615(1), 7.7938(1), 81.851(1), 70.622(1), 86.263(1), R-1/wR(2) = 0.0315/0.1083 for (I) and 6.9546(1), 7.3752(1), 7.8117(1), 81.986(1), 70.275(1), 85.988(1), R-1/wR(2) = 0.0275/0.0865 for (II)]. The crystal packing in (I) and (II) consists in a three-dimensional network made by layers, parallel to ac-plane. H2P2O72- shows bent eclipsed conformation and the M2+ ion lies on inversion centre. IR and Raman spectra confirm the bent geometry of the POP bridge angle. (C) 2009 Elsevier B.V. All rights reserved.
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页码：358 / 362
页数：5
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