V2O2F4(H2O)2·H2O: a new V(4+) layer structure related to VOF3

Area of Science:

• Inorganic Chemistry
• Materials Science
• Solid-State Chemistry

Background:

• Vanadium(IV) oxyfluorides are explored for frustrated magnet applications.
• Synthesis of 2D vanadium(IV) oxyfluoride structures typically involves ionic liquids.
• Previous research focused on triangular lattice vanadium selenites.

Purpose of the Study:

• To report the discovery and structural characterization of a novel 2D vanadium oxyfluoride.
• To investigate new synthetic routes for vanadium-based materials.
• To understand the structural features of frustrated magnets.

Main Methods:

• Solvothermal synthesis was employed.
• Structural analysis of the synthesized compound was performed.
• Crystallographic data was collected and refined.

Main Results:

• A new 2D layer structure, diaquatetra-μ-fluorido-dioxidodivanadium(IV) monohydrate (V2O2F4(H2O)2·H2O), was synthesized.
• The structure consists of infinite V(4+)-containing layers with fluorine-bridged, corner- and edge-sharing VOF4(H2O) octahedral units.
• The V(4+) center shows off-centering with a short V=O bond and elongated trans-V-F bond; hydrogen-bonded water molecules are present between layers.
• The layer topology is similar to that of VOF3.

Conclusions:

• A novel 2D vanadium oxyfluoride structure was successfully synthesized and characterized.
• The compound exhibits structural features relevant to frustrated magnetism.
• The discovery expands the known family of vanadium oxyfluoride materials.