Premium
New Quaternary Alkali‐Metal Hypodiphosphate Hydrates: Preparation, Crystal Structure, Vibrational Spectrum, and Thermal Behavior of K 4 P 2 O 6 ·8H 2 O and Na 2 K 2 P 2 O 6 ·8H 2 O in Comparison to Na 4 P 2 O 6 ·10H 2 O
Author(s) -
Gjikaj Mimoza,
Wu Peng,
Brockner Wolfgang
Publication year - 2012
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.201200130
Subject(s) - orthorhombic crystal system , alkali metal , raman spectroscopy , crystallography , hydrate , crystal structure , chemistry , aqueous solution , metal , infrared spectroscopy , formula unit , molecule , inorganic chemistry , physics , organic chemistry , optics
Single crystals of the alkali‐metal hypodiphosphates K 4 P 2 O 6 · 8H 2 O ( 1 ) and Na 2 K 2 P 2 O 6 · 8H 2 O ( 2 ) could be obtained and their crystal structures determined. The compounds 1 and 2 crystallize isotypic in the orthorhombic space group Pbca (no. 61) with four formula units in the unit cell. The crystal structures are built up by discrete [P 2 O 6 ] 4– units in an ethane‐like staggered conformation, by the corresponding alkali‐metal cations and water molecules. FT‐IR/FIR and FT‐Raman spectra of the crystalline title compounds were recorded and a complete assignment for the [P 2 O 6 ] 4– modes is proposed. Raman spectra of aqueous hypodiphosphate solutions deliver additional polarization data supporting the band assignment. Compounds 1 and 2 show a complete H 2 O loss in case of slow heating avoiding the formation of a hydrate melt.