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ChemInform Abstract: Intermediate States on the Way to Edge-Sharing BO4 Tetrahedra in M6B22O39·H2O (M: Fe, Co).

✍ Scribed by Stephanie C. Neumair; Johanna S. Knyrim; Oliver Oeckler; Robert Glaum; Reinhard Kaindl; Roland Stalder; Hubert Huppertz

Publisher
John Wiley and Sons
Year
2011
Weight
23 KB
Volume
42
Category
Article
ISSN
0931-7597

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✦ Synopsis

Co3O4 and H3BO3 in a Walker-type multi-anvil apparatus (6 GPa, 880 °C (Fe), 950 °C (Co), 10 min) and characterized by single crystal XRD, IR, Raman, and UV/VIS spectroscopy. They crystallize in the orthorhombic space group Pmn21 with Z = 2. The structure contains corner-sharing BO 4 tetrahedra and distorted BO 3 groups, which are close to BO4 tetrahedra considering additional oxygen atoms from neighboring BO4 tetrahedra in the coordination sphere. This situation is regarded as an intermediate state in the formation of edge-sharing tetrahedra. Fe6B22O39•H2O exhibits a remarkable intensity of second harmonic generation, but is less intensive than KH2PO4. -

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ChemInform Abstract: The New High-Pressure Borate Co7B24O42 (OH)2·2H2O — Formation of Edge-Sharing BO4 Tetrahedra in a Hydrate Borate.
✍ Stephanie C. Neumair; Reinhard Kaindl; Hubert Huppertz 📂 Article 📅 2012 🏛 John Wiley and Sons ⚖ 21 KB 👁 1 views

Hydrate Borate. -Violet, air-and water-resistant crystals of the title compound are synthesized from a stoichiometric mixture of Co3O4 and H3BO3 (Walker-type multianvil apparatus, 6 GPa, 880 °C, 5 min). The new high--pressure phase is characterized by powder and single crystal XRD, IR, and Raman spe