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Synthesis, Crystal Structure, and Physical Properties of the New Chain Alkalioxocuprate K 3 Cu 2 O 4
Author(s) -
Đuriš Katarina,
Kremer Reinhard K.,
Jansen Martin
Publication year - 2011
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.201100031
Subject(s) - antiferromagnetism , crystallography , crystal structure , magnetic susceptibility , valence (chemistry) , stoichiometry , single crystal , chemistry , bond length , materials science , condensed matter physics , physics , organic chemistry
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.