Structural features of the oxidonitridophosphates K3 M III(PO3)3N (M III = Al, Ga)

Igor V Zatovsky; Ivan V Ogorodnyk; Vyacheslav N Baumer; Ivan D Zhilyak; Ruslana V Horda; Nataliya Yu Strutynska

doi:10.1107/S2056989021011336

Structural features of the oxidonitridophosphates K₃ M ^III(PO₃)₃N (M ^III = Al, Ga)

Acta Crystallogr E Crystallogr Commun. 2021 Nov 2;77(Pt 12):1213-1218. doi: 10.1107/S2056989021011336. eCollection 2021 Dec 1.

Authors

Igor V Zatovsky¹, Ivan V Ogorodnyk², Vyacheslav N Baumer³, Ivan D Zhilyak⁴, Ruslana V Horda¹, Nataliya Yu Strutynska⁵

Affiliations

¹ F.D. Ovcharenko Institute of Biocolloidal Chemistry, NAS Ukraine, 42 Acad. Vernadskoho blv., 03142 Kyiv, Ukraine.
² ShimUkraine LLC, 18 Chigorina Str., office 429, 01042 Kyiv, Ukraine.
³ STC "Institute for Single Crystals", NAS of Ukraine, 60 Lenin ave., 61001 Kharkiv, Ukraine.
⁴ Faculty of Horticulture, Ecology and Plants Protection, Uman National University of Horticulture, 1 Instytutska str., 20305 Uman, Cherkassy region, Ukraine.
⁵ Department of Inorganic Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska str., 01601, Kyiv, Ukraine.

Abstract

Cubic crystals of tripotassium aluminium (or gallium) nitridotriphosphate, K₃ M ^III(PO₃)₃N (M ^III = Al, Ga), were grown by application of the self-flux method. In their isostructural crystal structures, all metal cations and the N atom occupy special positions with site symmetry 3, while the P and O atoms are situated in general positions. The three-dimensional framework of these oxidonitridophosphates is built up from [M ^IIIO₆] octa-hedra linked together via (PO₃)₃N groups. The latter are formed from three PO₃N tetra-hedra sharing a common N atom. The coordination environments of the three potassium cations are represented by two types of polyhedra, viz. KO₉ for one and KO₉N for the other two cations. An unusual tetra-dentate type of coordination for the latter potassium cations by the (PO₃)₃N^6- anion is observed. These K₃ M ^III(PO₃)₃N (M ^III = Al, Ga) compounds are isostructural with the Na₃ M ^III(PO₃)₃N (M ^III = Al, V, Ti) compounds.

Keywords: (PO3)3N anion; crystal structure; cubic symmetry; isotypism; self-flux crystal growth.