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Exploration into the Syntheses of Gallium‐ and Indiumborates under Extreme Conditions: M5B12O25(OH): Structure,Luminescence, and Surprising Photocatalytic Properties
Authors:Daniela Vitzthum  Dr Klaus Wurst  Johann M Pann  Prof?Dr Peter Brüggeller  Dr Markus Seibald  Prof?Dr Hubert Huppertz
Institution:1. Institut für Allgemeine, Anorganische und Theoretische Chemie, Leopold-Franzens-Universit?t Innsbruck, Innsbruck, Austria;2. OSRAM Opto Semiconductors GmbH, Schwabmünchen, Germany
Abstract:Explorative solid‐state chemistry led to the discovery of the two new compounds Ga5B12O25(OH) and In5B12O25(OH). Extreme synthetic conditions within the range of 12 GPa and a temperature of 1450 °C realized in a Walker‐type multianvil apparatus resulted in the formation of an unprecedented tetragonal structure with the exclusive presence of condensed BO4 tetrahedra, forming cuboctahedral cavities. Doping of these cavities with Eu3+ in In5B12O25(OH) yielded in an orange–red luminescence. Photocatalytic tests of In5B12O25(OH) revealed a hydrogen production rate comparable to TiO2 but completely co‐catalyst free.
Keywords:borates  high-pressure synthesis  luminescence  photocatalytic hydrogen production  structure elucidation
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