In:
Zeitschrift für anorganische und allgemeine Chemie, Wiley, Vol. 637, No. 9 ( 2011-07), p. 1101-1107
Abstract:
Single crystals of K 3 Cu 2 O 4 were prepared by the azide/nitrate route from respective stoichiometric mixtures of KN 3 , KNO 3 and CuO, at 923 K, whereas powder samples were synthesised by solid state reaction of K 2 O, KCuO 2 and CuO, sealed in gold ampoules and treated at 723 K. According to the single crystal structure analysis ( Cmcm , Z = 4, a = 6.1234(1), b = 8.9826(2), c = 10.8620(2) Å, R 1 = 0.044, R 2 = 0.107), the main structural feature are undulating ${1}\atop{{\infty}}$ CuO 2 chains built up from planar, edge sharing CuO 4 square units. From an analysis of the Cu–O bond lengths, the valence state of either +2 or +3 can be unambiguously assigned to each copper atom. The magnetic susceptibilities show the dominance of antiferromagnetic (AFM) interactions. At high temperatures, the magnetic behaviour can be fitted with the Curie–Weiss law ( μ eff = 1.84μ B , Θ = –105 K). The experimental data can be very well described by a uniform Heisenberg chain with a nearest‐neighbour spin intrachain interaction ( J nn ) of ~ 101 K.
Type of Medium:
Online Resource
ISSN:
0044-2313
,
1521-3749
DOI:
10.1002/zaac.201100031
Language:
English
Publisher:
Wiley
Publication Date:
2011
detail.hit.zdb_id:
201094-X
detail.hit.zdb_id:
1481139-X
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