Acta Cryst. (2004). C60, i79-i83 [doi:10.1107/S0108270104015938]
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) Å]. Compound (II) is the first reported diarsenate with a KAlP2O7-type structure and is isotypic with at least 27 AIMIII diphosphates. The average Sc-O bond lengths in (I) and (II) are 2.09 (2) and 2.09 (3) Å, 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.
Formula: KSc(HAsO4)2 and RbScAs2O7
Online 11 August 2004
 |   Structure factor file (CIF format) (68.9 kbytes) |
| Structure factor file (CIF format) (124.9 kbytes) |
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