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Preparation, Crystal Structure, Vibrational Spectra, and Thermal Behavior of Rb 2 H 2 P 2 O 6 ·2H 2 O
Author(s) -
Gjikaj Mimoza,
Wu Peng,
Brockner Wolfgang
Publication year - 2014
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201300341
Subject(s) - monoclinic crystal system , raman spectroscopy , crystallography , chemistry , rubidium , hydrogen bond , crystal structure , disproportionation , molecule , infrared spectroscopy , potassium , physics , biochemistry , organic chemistry , optics , catalysis
Single crystals of Rb 2 H 2 P 2 O 6 · 2H 2 O could be obtained from aqueous solutions of hypodiphosphoric acid and rubidium carbonate. Its crystal structure was determined by X‐ray diffraction and it crystallizes in the monoclinic space group P 2 1 / c with Z = 4. The salt‐like title compound consists of [H 2 P 2 O 6 ] 2– units in staggered P 2 O 6 ‐skeleton conformation, Rb + cations, and H 2 O molecules, held together by intermolecular hydrogen bonds of the type O ··· O. The vibrational spectra (IR/FIR and Raman) of the rubidium salt were recorded and an assignment of the vibrational modes is proposed based on the point group C 2 h for the P 2 O 6 ‐skeleton of the anion. The thermal behavior of Rb 2 H 2 P 2 O 6 · 2H 2 O is dominated by a complex TG decay indicating a simultaneous H 2 O delivery coupled with a disproportionation of [H 2 P 2 O 6 ] 2– , what is also supported by Raman spectra of heated samples.