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Pb   5    O  2    [WO   6    ]${\text{Pb}}_{5}{\text{O}}_{2}\left[{\text{WO}}_{6}\right]$was discovered as a frequently observed side phase during our investigation on lead tungstates. Its crystal structure was solved by single-crystal X-ray diffraction (P   2  1    /  n$P{2}_{1}/n$,a  =  7.4379   (  2  )$a=7.4379\left(2\right)$Å,b  =  12.1115   (  4  )$b=12.1115\left(4\right)$Å,c  =  10.6171   (  3  )$c=10.6171\left(3\right)$Å,β  =  90.6847   (  8  )$\beta =90.6847\left(8\right)$°,Z  =  4    $Z=4$,R   int    =  0.038    ${R}_{\text{int}}=0.038$,R  1   =  0.020    ${R}_{1}=0.020$,ω   R  2   =  0.029    $\omega {R}_{2}=0.029$, 4188 data, 128 param.) and is isotypic withPb   5    O  2    [Te   6    ]${\text{Pb}}_{5}{\text{O}}_{2}\left[{\text{Te}}_{6}\right]$.Pb   5    O  2    [WO   6    ]${\text{Pb}}_{5}{\text{O}}_{2}\left[{\text{WO}}_{6}\right]$comprises a layered structure built up by non-condensed [WO 6 ]6  −${}^{6-}$octahedra and[    O  4Pb    10]12  +${\left[{\text{O}}_{4}{\text{Pb}}_{10}\right]}^{12+}$oligomers. The compound was characterised by spectroscopic measurements (Infrared (IR), Raman and Ultraviolet–visible (UV/Vis) spectra) as well as quantum chemical and electrostatic calculations (density functional theory (DFT), MAPLE) yielding a band gap of 2.9 eV fitting well with the optical one of 2.8 eV. An estimation of the refractive index based on the Gladstone-Dale relationship yieldedn  ≈  2.31    $n\approx 2.31$. Furthermore first results of the thermal analysis are presented.

On tungstates of divalent cations (III) – Pb 5 O 2 [WO 6 ]