Abstract
Boron aluminum oxo chloride [BAC(10)], a microporous material, and its crystallization were investigated by X-ray diffraction (XRD), adsorption isotherms of probing molecules, infrared (IR), magic-angle spinning nuclear magnetic resonance (MAS NMR), visible Raman and ultraviolet (UV) Raman spectroscopy. XRD and adsorption isotherms indicate that BAC(10) consists of novel microporous crystals, and IR and NMR results confirmed that the primary building units are triangular BO3, tetrahedral BO4 and octahedral AlO6. No Raman signal in the visible Raman spectrum of BAC(10) was detected owing to the weakness of Raman scattering and strong fluorescence interference. However, strong Raman bands of this material were observed in the UV Raman spectra owing to the avoidance of fluorescence. The UV Raman spectra show that, during the crystallization process, the number of BO3 groups (bands at 300700 cm-1) decrease with increasing number of BO4 groups (bands at 9001000 cm-1) in the solid phase. These results suggest that in the crystallization of BAC(10), the polyborate anions are quickly depolymerized to monoborate species including BO3 and BO4 groups, which are then gradually crystallized to the framework of microporous BAC(10).
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