31P and 183W NMR Spectroscopic Evidence for Novel Peroxo Species in the "H3[PW12O40].cntdot.yH2O/H2O2" System. Synthesis and X-ray Structure of Tetrabutylammonium (.mu.-Hydrogen phosphato)bis(.mu.-peroxo)bis(oxoperoxotungstate) (2-): A Catalyst of Olefin Epoxidation in a Biphase Medium

Influence of composition of heteropolyphosphatotungstate catalyst on epoxidation of propylene

“…There is few result on 31 P MAS NMR spectra of heteropolyphosphatotungstates in the literature, but 31 P NMR spectra of heteropolyphosphatotungstates are studied quite detailedly. In the work of Salles et al [7], the 31 P NMR band of PW 4 , PW 3 , PW 2 locate at δ = −3.5, −1.6 and −0.5 ppm, respectively. Similarly, in the 31 P spectra of Hill et al [6], the band of PW 4 and PW 12 is at δ = 0.6 and −18.5 ppm, respectively.…”

Dititanium‐Containing 19‐Tungstodiarsenate(III) [Ti2(OH)2As2W19O67(H2O)]8−: Synthesis, Structure, Electrochemistry, and Oxidation Catalysis

“…[3i, 4] It is worth [19,[21][22][23] The resistance towards H 2 O 2 is known to increase with increasing POM charge. [19] To ascertain correct interpretation of the catalytic results, we addressed the question of stability of 1 in the presence of an excess of H 2 O 2 .…”

Alkylaminophosphazenes as Efficient and Tuneable Phase‐Transfer Agents for Polyoxometalate‐Catalysed Biphasic Oxidation with Hydrogen Peroxide

“…These signals are shiftedu pfield from the singlet peak of the neat iBuPN at 19.6 ppm ( Figure S1 in the SupportingI nformation). The UV/Vis spectrumo ft he DCE phase after shakingt he PWBzPN (1:6)/DCE-H 2 Os ystem shows the broad charge-transfer band of PW peakeda t2 68 nm ( Figure S7) [15,16] The UV/Vis spectrum of the DCE phase ( Figure S8 in the Supporting Information) shows two broad absorption bands at 250 and 292 nm, which can also be assigned to the peroxo PW species.…”