Synthesis and crystal structure of NaCuIn(PO4)2

• Main Authors: Elhassan Benhsina, Jamal Khmiyas, Said Ouaatta, Abderrazzak Assani, Mohamed Saadi, Lahcen El Ammari
• Format: Article
• Language: English
• Published: International Union of Crystallography 2020-03-01
• Series: Acta Crystallographica Section E: Crystallographic Communications
• Subjects: crystal structure; phosphate; amm'(po4)2 family; trigonal–bipyramidal coordination; isotypism
• Online Access: http://scripts.iucr.org/cgi-bin/paper?S2056989020001929

Single crystals of sodium copper(II) indium bis[phosphate(V)], NaCuIn(PO4)2, were grown from the melt under atmospheric conditions. The title phosphate crystallizes in the space group P21/n and is isotypic with KCuFe(PO4)2. In the crystal, two [CuO5] trigonal bipyramids share an edge to form a dimer [Cu2O8] that is connected to two PO4 tetrahedra. The obtained [Cu2P2O12] units are interconnected through vertices to form sheets that are sandwiched between undulating layers resulting from the junction of PO4 tetrahedra and [InO6] octahedra. The two types of layers are alternately stacked along [101] and are joined into a three-dimensional framework through vertex- and edge-sharing, leaving channels parallel to the stacking direction. The channels host the sodium cations that are surrounded by four oxygen atoms in form of a distorted disphenoid.