Square-Pyramidal/Triangular Framework Oxide: Synthesis and Structure of PKU-6
journal contribution
posted on 2007-06-11, 00:00 authored by Tao Yang, Jing Ju, Guobao Li, Fuhui Liao, Xiaodong Zou, Feng Deng, Lei Chen, Yingxia Wang, Jianhua LinPKU-6, a new aluminoborate (HAl<sub>2</sub>B<sub>3</sub>O<sub>8</sub>), has been synthesized
in a closed system at 400 °C. The structure of PKU-6, characterized by using powder and single-crystal X-ray diffraction, consists
of AlO<sub>5</sub> square-pyramidal chains and B<sub>3</sub>O<sub>7</sub> groups, which are
interconnected and form a three-dimensional framework. The <sup>27</sup>Al
NMR study indicates that the isotropic chemical shift of pyramidal
Al is 34.6 ppm with a large quadrupolar coupling constant (<i>C</i><sub>Q</sub> =
4.2 MHz), mainly due to a nonspherical coordination environment.
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