Crystal structure of Zn2(HTeO3)(AsO4)

• Main Authors: Felix Eder, Matthias Weil
• Format: Article
• Language: English
• Published: International Union of Crystallography 2021-05-01
• Series: Acta Crystallographica Section E: Crystallographic Communications
• Subjects: crystal structure; oxidotellurate(iv); oxidoarsenate(v); hydrogen bonding; lone pair electrons; stereochemical activity
• Online Access: http://scripts.iucr.org/cgi-bin/paper?S2056989021004333

Single crystals of Zn2(HTeO3)(AsO4), dizinc(II) hydroxidodioxidotellurate(IV) oxidoarsenate(V), were obtained as one of the by-products in a hydrothermal reaction between Zn(NO3)2·6H2O, TeO2, H3AsO4 and NH3 in molar ratios of 2:1:2:10 at 483 K for seven days. The asymmetric unit of Zn2(HTeO3)(AsO4) contains one Te (site symmetry m), one As (m), one Zn (1), five O (three m, two 1) and one H (m) site. The ZnII atom exhibits a coordination number of 5 and is coordinated by four oxygen atoms and a hydroxide group, forming a distorted trigonal bipyramid. The hydroxide ion is positioned at a significantly larger distance on one of the axial positions of the bipyramid. The [ZnO4OH] polyhedra are connected to each other by corner-sharing to form ∞2[ZnO3/2(OH)1/2O1/1] layers extending parallel to (001). The TeIV atom is coordinated by three oxygen atoms and a hydroxide group in a one-sided manner in the shape of a bisphenoid, revealing stereochemical activity of its 5s2 electron lone pair. The AsV atom is coordinated by four oxygen atoms to form the tetrahedral oxidoarsenate(V) anion. By corner-sharing, [TeO3OH] and [AsO4] groups link adjacent ∞2[ZnO3/2(OH)1/2O1/1] layers along [001] into a three-dimensional framework structure.