Complexes of Keggin‐Type Monolacunary Heteropolytungstates: Synthesis and Characterisation

New Polyoxotungstates with Ln(III) and Co(II) and Their Immobilization in Silica Particles

“…The IR spectra of all the new lanthanotungstocobaltates had the bands corresponding to the ν as (W-O d ) vibration at lower frequency than CoW 12 . This is consistent with previous observations for other lacunary and metal-substituted POMs [16][17][18][19][20]. The splitting of the band corresponding to ν as (W-O c -W) was associated with the distortion of the Keggin anions in the new compounds, in comparison with CoW 12 .…”

Terbiumpolyoxotungstate Anions as Building Units to Fabricate Nanostructured Films

“…Assignments for the major bands observed in the infrared and Raman spectra are presented in Table 1. The terbiumpolyoxotungstates exhibit characteristic bands of Keggin-type anions, namely the terminal W=O stretch and several bands at lower wavenumbers assigned to W-O-W corner-shared or W-O-W edge-shared stretching modes of the POM polyhedra [12]. The infrared spectrum of terbiumpolyoxophosphate also shows two characteristic P-O stretch bands at 1047 and 1104 cm -1 .…”

A novel supramolecular organic–inorganic adduct containing α-Keggin-type [PW12O40]3−anions and benzo-15-crown-5 molecules

“…Following our recent research on the synthesis and structural characterization of novel hybrid compounds containing -Keggin-type polyoxometalates and lanthanide coordination compounds (Soares-Santos, Nogueira, Fe  lix et al, 2003;Soares-Santos, Nogueria, Paz et al, 2003;Cavaleiro et al, 1999;Gamelas et al, 1999), we came across the title compound, (I). Interestingly, as revealed by a search in the Cambridge Structural Database (Allen, 2002) (You, Wang, Zhang et al, 2000).…”