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Jantz SG, Pielnhofer F, Höppe HA. On tungstates of divalent cations (III) – Pb5O2[WO6]. Z KRIST-CRYST MATER 2020. [DOI: 10.1515/zkri-2020-0041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
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 with
Pb
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 [WO6]
6
−
${}^{6-}$
octahedra and
[
O
4
Pb
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 yielded
n
≈
2.31
$n\approx 2.31$
. Furthermore first results of the thermal analysis are presented.
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Affiliation(s)
- Stephan G. Jantz
- Lehrstuhl für Festkörperchemie , Universität Augsburg , Universitätsstraße 1 , 86159 Augsburg , Germany
| | - Florian Pielnhofer
- Institut für Anorganische Chemie , Universität Regensburg , 93053 Regensburg , Germany
| | - Henning A. Höppe
- Lehrstuhl für Festkörperchemie , Universität Augsburg , Universitätsstraße 1 , 86159 Augsburg , Germany
| |
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