The inclusion complexes A?B and C of vanillin with β-cyclodextrin (β-CD) were prepared by means of changing preparation methods, such as medium and reducing temperature time. XRD results of inclusion complexes of β-CD with vanillin indicated that among the crystals of three inclusion complexes, only A is of obvious channel-type packing strcture, and has specific peak at 1.2nm (about 7 degrees), with indicates formation inclusion complex.The reason is that the crystals of B and C must be mixed with some emptyβ-CD, according to change of medium or reducing temperature time,and this can be confirmed by DSC analysis.
Hierarchical europium oxalate Eu2（C2O4）3.10H2O micro-particles were synthesized through a simple precipitation method at room temperature in present of trisodium citrate. The products were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, and photoluminescence. The possible formation mechanism of the hierarchical europium oxalate Eu2（C2O4）3.10H2O micro-particles was discussed.
