Keggin-type cesium salt of first series transition metal-substituted phosphomolybdates: one-pot easy synthesis, structural, and spectral analysis

The Keggin-type cesium salt of transition metal-substituted phosphomolybdates, Cs5[PCo(H2O)Mo11O39] · 6H2O (1) and Cs5[PMn(H2O)Mo11O39] · 6H2O (2), were synthesized from commercially available H3PMo12O40. The compounds were characterized by thermal, structural, and spectroscopic techniques. X-ray structural analysis reveals that, in these isostructural disordered compounds, the transition metal (Co/Mn) and Mo atoms are distributed over 12 positions. The presence of Co/Mn atoms was confirmed by powder XRD, FT-IR, DR-UV-Vis, ESR, and 31P NMR studies.