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用一步法合成了2个新化合物Cs2CeI5和Cs2PrI5，测试了这2个化合物的荧光性质，初步确定了Cs2CeI5和Cs2PrI5的结构，它们都属于四方晶系，是同型物（晶胞参数Cs2CeI5:a=1．0566nm，c=0.8729nm；Cs2PrI5:a=1.0543nm，c=0．8704nm）．并且还用XANES法测定了Cs2PrI5中Pr的价态．
Two new compounds, Cs2CeI5 and Cs2PrI5, were synthesized by one-step method. The fluorescence properties of these two compounds were tested and the structures of Cs2CeI5 and Cs2PrI5 were determined. All of them belong to the tetragonal system and are isoforms (unit cell parameter Cs2CeI5: a = 1.0566 nm, c = 0.8729 nm; Cs2PrI5: a = 1.0543 nm, c = 0.8704 nm). The valence of Pr in Cs2PrI5 was also determined by XANES method.