Hydrothermal synthesis and properties of MIIMIIIF5(H2O)7 (MII = Co2+ and Ni2+, MIII = Mn3+, Ga3+, and In3+)

• Published in: Solid state sciences 2020-10, Vol.108, Article 106374
• Main Authors: Keerthisinghe, Navindra, Klepov, Vladislav V., Zhang, Eric, Smith, Mark D., Egodawatte, Shani, Foulger, Stephen H., zur Loye, Hans-Conrad
• Format: Article
• Language: English
• ISSN: 1293-2558; 1873-3085
• DOI: 10.1016/j.solidstatesciences.2020.106374

A family of new compounds with a general formula MIIMIIIF5(H2O)7 (MII = Co2+ and Ni2+, MIII = Mn3+, Ga3+, and In3+), along with a related compound [Ni(H2O)6][InF4(H2O)2]2, was obtained via hydrothermal crystal growth and characterized using single crystal X-ray diffraction. All compounds adopt related structural motifs and differ in slight symmetry distortions rather than overall change in packing. No direct relationships between the cation size and symmetry of the crystals were found, moreover, [Co(H2O)6]2[MnF4(H2O)2][MnF6] that exhibits Jahn-Teller distortions of the Mn octahedra adopts the same structure as [Ni(H2O)6]2[InF4(H2O)2][InF6], which is lacking such distortions. Magnetic and spectroscopic properties of the former compound are also reported. The ‘mild’ hydrothermal crystal growth technique has been leveraged to synthesize seven new transition-metal fluorides whose structures were determined by single-crystal X-ray diffraction and confirmed by powder X-ray diffraction. Magnetic and spectroscopic properties are reported. [Display omitted] •Hydrothermal synthesis of complex inorganic oxyfluoride salts was performed.•The packing of the inorganic complexes was studied using Voronoi polyhedra.•[Co(H2O)6]2[MnF4(H2O)2][MnF6] shows paramagnetic behavior.