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## Abstract

$Pb5O2[WO6]$ 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 ($P21/n$, $a=7.4379(2)$ Å, $b=12.1115(4)$ Å, $c=10.6171(3)$ Å, $β=90.6847(8)$°, $Z=4$, $Rint=0.038$, $R1=0.020$, $ωR2=0.029$, 4188 data, 128 param.) and is isotypic with $Pb5O2[Te6]$. $Pb5O2[WO6]$ comprises a layered structure built up by non-condensed [WO6]$6−$ octahedra and $[O4Pb10]12+$ 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 yielded $n≈2.31$. Furthermore first results of the thermal analysis are presented.