Alkali scandium arsenates. I. The framework structures of KSc(HAsO4)2 and RbScAs2O7

Acta Crystallographica. Section C, Crystal Structure Communications
Karolina Schwendtner, Uwe Kolitsch

Abstract

The crystal structures of hydrothermally synthesized potassium scandium hydrogen arsenate(V), KSc(HAsO4)2, (I), and rubidium scandium diarsenate(V), RbScAs2O7, (II), were determined from single-crystal X-ray diffraction data collected at room temperature. Compound (I) represents a new microporous structure type, designated MCV-3, which is characterized by a three-dimensional framework of corner-sharing alternating ScO6 octahedra and HAsO4 tetrahedra. Intersecting tunnels parallel to [101] and [110] host eight-coordinate K atoms. There is one hydrogen bond of medium strength [O...O = 2.7153 (18) A]. Compound (II) is the first reported diarsenate with a KAlP2O7-type structure and is isotypic with at least 27 A(I)M(III) diphosphates. The average Sc-O bond lengths in (I) and (II) are 2.09 (2) and 2.09 (3) A, respectively. The K and Sc atoms in (I) lie on an inversion centre and a twofold axis, respectively. All atoms in (II) are in general positions.

Citations

Jan 1, 2009·Acta Crystallographica. Section E, Structure Reports Online·Jan CempírekZdirad Zák
Jun 19, 2014·Acta Crystallographica. Section E, Structure Reports Online·Najoua OuerfelliAhmed Driss
Apr 4, 2015·Acta Crystallographica. Section C, Structural Chemistry·Sabina KovačTamara Đorđević
Jun 6, 2018·Acta Crystallographica. Section C, Structural Chemistry·Karolina Schwendtner, Uwe Kolitsch
Aug 6, 2019·Acta Crystallographica. Section C, Structural Chemistry·Karolina Schwendtner, Uwe Kolitsch
Sep 22, 2017·Acta Crystallographica. Section E, Crystallographic Communications·Karolina Schwendtner, Uwe Kolitsch
Aug 18, 2018·Acta Crystallographica. Section E, Crystallographic Communications·Karolina Schwendtner, Uwe Kolitsch
May 23, 2017·Acta Crystallographica. Section E, Crystallographic Communications·Karolina Schwendtner, Uwe Kolitsch
Dec 19, 2017·Acta Crystallographica. Section E, Crystallographic Communications·Karolina Schwendtner, Uwe Kolitsch
Mar 15, 2019·Acta Crystallographica. Section E, Crystallographic Communications·Karolina Schwendtner, Uwe Kolitsch
Oct 16, 2018·Acta Crystallographica. Section E, Crystallographic Communications·Karolina Schwendtner, Uwe Kolitsch

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