二价铥三元碘化物研究

用一步法合成了ATmI₃(A=K,Rb,Cs)和A₄TmI₆(A=Rb,Cs)两类化合物.用X射线粉末衍射法确定其晶体结构.CsTmI₃、RbTmI₃和KTmI₃都属正交晶系,Z=4.CsTmI₃:a=0.8689(3)nm,b=1.2339(4)nm,c=0.8565(3)nm,空间群Pnma;RbTmI₃:a=1.0381(3)nm,b=0.4686(3)nm,c=1.7256(9)nm,空间群Pnma;KTmI₃:a=0.4576(2)nm,b=1.5133(20)nm,c=1.1679(6)nm,空间群Pmcm;3种结构中八面体结构单元TmI₆]的连接方式不同,分别为共顶点、共棱和共顶点同时共棱方式连接.Cs、Rb和K原子的配位数依次下降,分别为10、9和8.Cs₄TmI₆和Rb₄TmI₆的结构属于K₄CdCl₆型,三方晶系,空间群R3 c,Z=6.Cs₄TmI₆:a=1.4516(1)nm,C=1.8292(2)nm,Rb₄TmI₆:a=1.41714(9)nm,c=1.7473(1)nm.

Studies on Divalent Thulium Ternary Iodide

In this paper two types of compounds ATmI 3(A=K, Rb, Cs) and A 4TmI 6(A=Rb, Cs)] were synthesized by one step procedure and their crystal structures were determined by X ray powder diffraction. The crystal structures of CsTmI 3, RbTmI 3 and KTmI 3 are orthorhombic ones. CsTmI 3: a =0 868 9(3) nm, b =1 233 9(4) nm, c =0 856 5(3) nm, space group: Pnma , Z =4; RbTmI 3: a =1 038 1(3) nm, b =0 468 6(3) nm, c =1 725 6(9) nm; space group: Pnma , Z=4; KTmI 3: a =0 457 6(2) nm, b =1 513 3(20) nm, c = 1 167 9(6) nm, space group: Cmcm , Z =4; The linking manner among the structural unit of octahedral in the three kinds of structures are different and they are corner sharing, edge sharing and both corner and edge sharing separately. The coordination number of atom of Cs, Rb and K decreases orderly and they are 10, 9 and 8. The structures of Cs 4TmI 6 and Rb 4TmI 6 belong to K 4CdCl 6 type(trigonal, space group: R 3 c , Z =6). Rb 4TmI 6: a = 1 417 14(9) nm, c =1 747 3(1) nm, Cs 4TmI 6: a =1 451 6(1) nm, c =1 829 2(2) nm.