The crystal structure of the first synthetic copper(II) tellurite arsenate, Cu^II ₅(Te^IVO₃)₂(As^VO₄)₂

Abstract

Crystals of the first synthetic copper tellurite arsenate, Cu II 5 (Te IV O 3 ) 2 (As V O 4 ) 2 [systematic name pentacopper(II) bis-oxotellurate(IV) bis-oxoarsenate(V)], were grown by the chemical vapour transport method and structurally determined using single-crystal X-ray diffraction. Cu II 5 (Te IV O 3 ) 2 (As V O 4 ) 2 possesses a novel structure type including a new topological arrangement of Cu II and O atoms. Cu II 5 (Te IV O 3 ) 2 (As V O 4 ) 2 is formed from a framework of two types of Jahn-Teller distorted [Cu II O 6 ] octahedra (one of which is considerably elongated) and [Cu II O 5 ] square pyramids, which are linked by edge-sharing to form chains and dimers and by corner-sharing to complete a three-dimensional framework. [As V O 4 ] tetrahedra and [Te IV O 5 ] polyhedra bridge the edges of channels along the a-axis direction, with void space remaining for the Te IV stereoactive 5s 2 lone pairs. A comparison is made between the crystal structure of Cu II 5 (Te IV O 3 ) 2 (As V O 4 ) 2 and those of known compounds and minerals, in particular fumarolitic Cu minerals.

Synthesis and crystal structure of (NH4)[Ni3(HAsO4)(AsO4)(OH)2]

“…As shown for other tetrahedral oxido-anions such as sulfate [SO 4 ] 2- (Weil & Shirkhanlou, 2017a,b,c), selenate [SeO 4 ] 2- (Weil & Shirkhanlou, 2017a,b,c) or phosphate [PO 4 ] 3- (Zimmermann et al, 2011;Eder & Weil, 2020), similar attempts were made for arsenate [AsO 4 ] 3anions. In this regard, the syntheses of transition-metal oxidotellurate(IV) arsenate(V) phases have previously been reported and accomplished by a chemical transport reaction for Cu 5 (TeO 3 ) 2 (AsO 4 ) 2 (Missen et al, 2020) and by the hydrothermal method for Zn 2 (HTeO 3 )(AsO 4 ) (Eder & Weil, 2021).…”

Crystal structure of Zn2(HTeO3)(AsO4)

“…sulfates [e.g. Missen et al, 2020]. Crystals of Cu 5 (TeO 3 ) 2 (AsO 4 ) 2 have been grown by a chemical transport reaction (Binnewies et al, 2012), starting from CuO, TeO 2 and As 2 O 5 at temperatures of 1023 K (source) and 953 K (sink).…”

Single crystals of SnTe3O8 in the millimetre range grown by chemical vapor transport reactions

“…Single-crystal growth of oxidotellurates(IV) can be accomplished through various crystallization methods including, for example, experiments under hydrothermal conditions (Weil et al, 2018), cooling from the melt (Sto ¨ger et al, 2009), from salt melts as fluxing agents (Weil, 2019), or from chemical vapor transport reactions (Missen et al, 2020). The latter method (Binnewies et al, 2012) is particularly suitable for growing large crystals of high quality and was the ISSN 2056-9890 method of choice for crystal growth of SnTe 3 O 8 for which a more precise and accurate structure refinement appeared to be desirable.…”