Abstract
Three new alkali and alkaline earth iron vanadates have been synthesized via high‐temperature hydrothermal brines. Compound 1, Rb2FeV6O16, is built from vanadium(IV/V) oxo layers with iron(III) tetrahedra embedded in them, crystallizing in space group Cc. Compound 2, Cs2FeV6O16, has similar vanadium‐rich layers, but with a very different pattern to the layered structure in space group P1. The difference in alkali metal between 1 and 2 influences the polarity of the iron vanadate layers. Compound 3, SrFe3V18O38, crystallizes in space group R3, with a complex three‐dimensional vanadate framework containing vanadium(IV) and vanadium(III/IV) octahedra. The framework is templated by Fe(III) tetrahedra and octahedra as well as Sr cuboctahedra. All compounds were characterized by single‐crystal X‐ray diffraction, Raman spectroscopy, and energy‐dispersive X‐ray spectroscopy (EDX). Broadly, this study demonstrates the structural variety that can be obtained by exploiting the sensitivity of vanadium's coordination and oxidation state in a novel hydrothermal halide environment.
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