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Co 2 As 2 O 5 – the First Cobalt(II)‐Arsenate(III)
Author(s) -
Lösel Stefan,
Hillebrecht Harald
Publication year - 2008
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.200800232
Subject(s) - crystallography , octahedron , triclinic crystal system , tetrahedron , trigonal bipyramidal molecular geometry , cobalt , trigonal crystal system , crystal structure , chemistry , materials science , inorganic chemistry
Co 2 As 2 O 5 was obtained as a by‐product from the single crystal growth of CoAs 2 . The triclinic crystal structure ( $P{\bar 1}$ , a = 6.223(1), b = 9.169(2), c = 9.259(2) Å, α = 66.95(3), β = 82.18(3), γ = 79.28(3)°, Z = 4, R 1 ( F ) = 0.057, w R 2 ( F 2 ) = 0.141) represents a new structure type. As typical for As III it contains trigonal‐pyramidal ψ‐tetrahedra [AsO 3 ] 3− . The four crystallographically different As‐atoms are arranged in monomeric units and trimeric chain fragments [As 3 O 7 ] 5− . The surroundings of the four cobalt(II) atoms are remarkably unequal and show tetrahedral, trigonal‐bipyramidal and distorted octahedral coordinations. The octahedra form double‐chains linked to layers by the trigonal bipyramids and dimers of the tetrahedra.