SBA-15分子筛用于组装二溴对氯偶氮胂

以煅烧的分子筛SBA-15为主体材料,二溴对氯偶氮胂(dibromochloro-arsenazo,DBC-ASA)作客体材料,以水为介质,用液相移植法制备了(SBA-15)-(DBC-ASA)主客体复合材料.用粉末X射线衍射、Fourier变换红外光谱、固体扩散漫反射吸收光谱及发光研究表征了所制得的复合材料(SBA-15)-(DBC-ASA)的性质.X射线衍射结果表明:(SBA-15)-(DBC-ASA)主客体复合材料分子筛骨架存在且有序度高.红外光谱分析表明:较低量的DBC-ASA引入SBA-15分子筛中,分子筛骨架结构仍然存在,但引入量较大时,分子筛的骨架有序度明显降低.固体扩散漫反射吸收光谱研究表明:DBC-ASA处于分子筛SBA-15孔道内,分子筛孔道对DBC-ASA具有立体限域效应.发光光谱分析表明:所制得的样品的非辐射过程强,导致电子-光子作用极强,产生电荷迁移和跃迁,发生Stokes位移,光谱谱带变宽.

USE OF MOLECULAR SIEVE SBA - 15 FOR INCORPORATION OF DIBROMOCHLORO-ARSENAZO

Molecular sieve(SBA15)-(dibromochloro-arsenazo,DBC-ASA) host-guest composite materials were prepared by a liquid-phase grafting method using the calcined SBA15 molecular sieve as the host material,the DBC-ASA solution as the guest material,and water as the medium.The composite materials (SBA15)-(DBC-ASA) were characterized by X-ray diffraction(XRD),Fourier transform infrared(FTIR)spectra,solid state diffuse reflectance absorption spectra,and luminescence studies.The XRD results show that the molecular sieve framework in the(SBA15)-(DBC-ASA) host-guest composite materials is retained,and is highly ordered.The FTIR spectra indicate that the framework of the SBA15 molecular sieve is retained when a small amount of DBC-ASA is incorporated into it,the order degree of the molecular sieve decreases when a large amount of DBC-ASA is incorporated into it.The solid state diffuse reflectance absorption spectra show that DBC-ASA is located in the channel of the SBA15 molecular sieve,and the channel of SBA15 has stereoconfinment.The luminescence spectra show a strong non-radiation transition processes in the prepared samples,and this results in very strong electron-photon interaction causing a charge transfer transition.The Stokes displacement takes place and the spectrum bands broaden.