Square-pyramidal/triangular framework oxide: synthesis and structure of PKU-6.
PKU-6, a new aluminoborate (HAl2B3O8), has been synthesized in a closed system at 400 degrees C. The structure of PKU-6, characterized by using powder and single-crystal X-ray diffraction, consists of AlO5 square-pyramidal chains and B3O7 groups, which are interconnected and form a three-dimensional framework. The 27Al NMR study indicates that the isotropic chemical shift of pyramidal Al is 34.6 ppm with a large quadrupolar coupling constant (CQ=4.2 MHz), mainly due to a nonspherical coordination environment.
Yang
Tao
T
Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Ju
Jing
J
Li
Guobao
G
Liao
Fuhui
F
Zou
Xiaodong
X
Deng
Feng
F
Chen
Lei
L
Wang
Yingxia
Y
Lin
Jianhua
J