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The barium oxoantimonates(III) Ba 3 [SbO 3 ] 2  (triclinic, P1̄, a = 615.2(8), b = 981.4(3), c = 1215.4(5) pm, α =74.683(9), β =89.710(6), γ =71.464(7)°, Z =2, R1=0.0802) and Ba 2 [Sb 2 O 5 ] (orthorhombic, Cmcm, a = 401.0(3), b = 1450.6(7), c = 636.6(6) pm, Z = 4, R1 = 0.0589) have been synthesized from melts of elemental barium and antimony oxide Sb2O3 at a temperature of 800 °C. Their oxoantimonate building units are strongly influenced by the stereochemically active lone pair electrons of the pentele element: In the Ba rich compound Ba 3 [SbO 3 ] 2 , isolated ψ tetrahedra [SbO 3 ] 3−  are present, in Ba 2 [Sb 2 O 5 ], which crystallizes with the Sr 2 Bi 2 O 5  structure type, two of these ψ tetrahedra are condensed to form nucelar units [Sb 2 O 5 ] 4− . The two compounds are compared in terms of structure and bonding with the alkali antimonates on one hand and with the alkaline earth bismutates on the other.

zeitschrift für naturforschung b

Neue Barium-Oxoantimonate(III): Darstellung und Kristallstruktur von Ba 3 [SbO 3 ] 2  und Ba 2 [Sb 2 O 5 ]/New Barium Oxoantimonates(III): Synthesis and Crystal Structures of Ba 3 [SbO 3 ] 2  and Ba 2 [Sb 2 O 5 ]