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The first proof of protonated anion tetrahedra in the tsumcorite-type compounds

T. Mihajlovi^* and H. Effenberger

Institut für Mineralogie und Kristallographie, Universität Wien, Geozentrum, Althanstr. 14, A-1090 Wien, Austria

^* E-mail: tamara.mihajlovic{at}univie.ac.at

Hydrothermal synthesis produced the new compound SrCo₂(AsO₄)(AsO₃OH)(OH)(H₂O). The compound belongs to the tsumcorite group (natural and synthetic compounds with the general formula M(1)M(2)₂(XO₄)₂(H₂O,OH)₂; M(1)^1+,2+,3+ = Na, K, Rb, Ag, NH₄, Ca, Pb, Bi, Tl; M(2)^2+,3+ = Al, Mn³⁺, Fe³⁺, Co, Ni, Cu, Zn; and X^5+,6+ = P, As, V, S, Se, Mo). It represents (1) the first Sr member, (2) the until now unknown [7]-coordination for the M(1) position, (3) the first proof of (partially) protonated arsenate groups in this group of compounds, and (4) a new structure variant.

The crystal structure of the title compound was determined using single-crystal X-ray diffraction data. The compound is monoclinic, space group P2₁/a, with a = 9.139(2), b = 12.829(3), c = 7.522(2) Å ,ß = 114.33(3)°, V = 803.6(3) Å ³, Z = 4 [wR2 = 0.065 for 3530 unique reflections]. The hydrogen atoms were located experimentally.

KEYWORDS: SrCo₂(AsO₄)(AsO₃OH)(OH)(H₂O), tsumcorite group, hydrothermal synthesis, crystal structure, hydrogen bonds, protonated arsenate

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