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Issue 40, 2019
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Ca10Na10[Te9O42](H2O): a hydrothermally synthesized quaternary tellurium(vi) oxide containing edge-sharing octahedral trimers

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Abstract

A new tellurium(VI) oxycompound, Ca10Na10[Te9O42](H2O), was synthesized by a high-temperature, high-pressure hydrothermal reaction at 550 °C, its structure determined by single-crystal X-ray diffraction, and further characterized by energy dispersive, infrared, and X-ray photoelectron spectroscopy. The compound crystallizes in the centrosymmetric trigonal space group R[3 with combining macron]c (no. 167) with a = 9.743(2), c = 66.337(13) Å, and Z = 6. The structure consists of discrete linear edge-sharing octahedral trimers with the composition Te3O1410−, which is a new type of finite Te–O oligomer with Te6+ only. The large complex anions form a hexagonal close-packed lattice with the octahedral and tetrahedral interstices being filled with Ca2+ and Na+ cations and water molecules. The octahedral trimers in every other h.c.p. layer rotate around the 31 screw axis for 120°; therefore the unit cell has a very long c axis. This work is one of the few examples of the synthesis of metal tellurates by supercritical hydrothermal techniques.

Graphical abstract: Ca10Na10[Te9O42](H2O): a hydrothermally synthesized quaternary tellurium(vi) oxide containing edge-sharing octahedral trimers

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Publication details

The article was received on 30 Aug 2019, accepted on 16 Sep 2019 and first published on 16 Sep 2019


Article type: Paper
DOI: 10.1039/C9DT03521D
Dalton Trans., 2019,48, 15231-15235

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    Ca10Na10[Te9O42](H2O): a hydrothermally synthesized quaternary tellurium(VI) oxide containing edge-sharing octahedral trimers

    L. Zhang and K. Lii, Dalton Trans., 2019, 48, 15231
    DOI: 10.1039/C9DT03521D

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