Abstract
Using hydrothermal techniques, two new compounds—strontium borate SrBO2(OH) and barium polyborate Ba3B6O9(OH)6—have been prepared. The structures of the title compounds were solved by single-crystal X-ray diffraction analysis. In the structure of SrBO2(OH), the Sr2+ ion is surrounded by eight oxygen atoms and the borate ion is identified as an individual [BO2(OH)]2− group. The structure of Ba3B6O9(OH)6 can be regarded as constructed from anionic borate chains, the negative charges of which are compensated for by the Ba2+ cations residing between the adjacent chains. The unusual feature of this compound can also be described in terms of infinite chains of B3O3 six-membered rings sharing B atoms, which are all tetrahedrally coordinated by oxygen atoms. The materials have also been characterized by infrared and energy dispersive spectroscopies, thermal analysis, and second harmonic generation powder measurement.
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