New quinary cesium vanadium (IV) fluorophosphates, CsVOF(PO3F) and CsV2O2F(PO3F)2·H2O

Synthesis, Crystal Structure, and Magnetism in Fluoride Sulfates, A2VF3(SO4) (A = K, Rb, Cs)

“…The spectra of A 2 VF 3 (SO 4 ) (A = K, Rb, Cs) did not show any peaks stemming from hydroxyl ions at approximately 3500 cm –1 (Figure S7). Moreover, the antisymmetric stretching mode (ν3) of the (SO 4 ) 2– ions was observed at 1223–1240 cm –1 in all three compounds; the asymmetric bending modes (ν4) of the (SO 4 ) 2– ions were found at 613–687 cm –1 for K, 609–681 cm –1 for Rb, and 607–677 cm –1 for Cs. The symmetric bending mode (ν2) of (SO 4 ) 2– ions at 420–427 cm –1 was clearly identified in all spectra, confirming the presence of (SO 4 ) 2– ions. , …”

“…The combination of oxyanion groups with halides motivated our extensive exploratory synthesis in multianionic vanadium systems, specifically focusing on vanadium fluoro-phosphates 9 and vanadium fluoro-sulfates. Our ultimate goal in this field was to expand the range of known V x O y F z compounds to create novel structural building units and to understand the relationship between the variable structural parameters formed by functional V x O y F z and their magnetic properties.…”