A New Ammonium Borogermanate Made of Infinite Chain Building Blocks Synthesized by Flux Method

Crystal Research Center, Shanghai Institute of Ceramics, CAS* Shanghai Institute of Ceramics, Chinese Academy of Science, China**
○Jing-Tai Zhao* Ding-Bang Xiong** Hao-Hong Chen** Man-Rong Li** Xin-Xin Yang**

A new microporous borogermanate NH4[BGe3O8] has been synthesized by a molten boric acid flux method with “reagent” quantities of water in which GeO2, en, H2O and H3BO3 (5 : 8 : 14 : 25) were heated together at 513 K for 4 days. It is noteworthy that the high viscosity of reactive medium and the quantity of water play important role in the formation of the compound. The structure consists of {Ge6O18}n chains, further linked together via BO4 tetrahedra, forming a three-dimensional open framework with intersecting channel systems including 1-D ten-membered rings (MRs) channels. Interestingly, the infinite chains {Ge6O18}n as building block, built of alternate four- and six-MRs made of vertex-sharing GeO4 tetrahedra.
Keywords: Crystal structure; Borogermanate; Flux method.
[1]. Li, Y. F.; Zou, X. D. Angew. Chem. Int. Ed., 2005, 44, 2012.
[2]. Li, M. R.; Liu, W.; Ge, M. H.; Chen, H. H.; Yang, X. X.; Zhao, J. T. Chem. Comm., 2004, 1272.