Premium
Synthesis and Crystal Structure of {(NH 4 ) x Co ((3– x )/2) }(H 2 O) 2 [BP 2 O 8 ] · (1 – x ) H 2 O ( x ≈ 0.5)
Author(s) -
Schäfer Gerd,
CarrilloCabrera Wilder,
Schnelle Walter,
Borrmann Horst,
Kniep Rüdiger
Publication year - 2002
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 - 10.1002/1521-3749(200201)628:1<289::aid-zaac289>3.0.co;2-h
Subject(s) - chemistry , crystallography , hydrate , crystal structure , cobalt , stereochemistry , inorganic chemistry , organic chemistry
A borophosphate hydrate with general composition {(NH 4 ) x Co ((3– x )/2) }(H 2 O) 2 [BP 2 O 8 ] · (1 – x ) H 2 O ( x ≈ 0.5) was prepared under mild hydrothermal conditions ( T = 170 °C). The crystal structure of the purple title compound was refined in space group P 6 5 (no. 170) as a merohedric twin ( a = 949.14 pm, c = 1558.25 pm, R 1 = 0.037, w R 2 = 0.092 for all data). According to preliminary X‐ray investigations, vis‐spectra, and magnetic susceptibility measurements, a second blue coloured variant exhibits a superstructure of the title compound with a change in coordination numbers around cobalt from six and five to six and four. Both phases show reversible de‐/rehydration properties.