New Heptafluorozirconates and -hafnates AIBIIZr(Hf)F7 (AI = Rb, Tl; BII = Ca, Cd) – Synthesis, Structures, and Structural Relationships
作者:Lynda Meddar、Malika El-Ghozzi、Daniel Avignant
DOI:10.1002/zaac.200700465
日期:2008.3
Four new ABZrF7 heptafluorozirconates (A = Rb, Tl; B = Ca, Cd) and their homologous heptafluorohafnates, all colorless, orthorhombic Cmcm (no63), Z = 4, have been synthesized by heating stoichiometric mixtures of RbF or TlF, CaF2 or CdF2 and ZrF4 (HfF4) in sealed platinum tubes at temperature ranging from 550 °C (Tl) to 600 °C (Rb). The crystal structures of both RbCdZrF7 and TlCdZrF7 have been solved
四种新的 ABZrF7 七氟锆酸盐(A = Rb、Tl;B = Ca、Cd)及其同源七氟铪酸盐,均为无色、斜方晶系 Cmcm(no63)、Z = 4,已通过加热 RbF 或 TlF、Ca2F2 或 Ca2F2 的化学计量混合物合成和 ZrF4 (HfF4) 在密封铂管中,温度范围为 550 °C (Tl) 到 600 °C (Rb)。RbCdZrF7 和 TlCdZrF7 的晶体结构已从单晶 X 射线衍射数据中解出。Rietveld 精修是根据 RbCaZrF7 和 TlCaZrF7 的 X 射线粉末图案进行的。在这一系列的七氟化物中,B2 + 和 Zr4 + 阳离子都表现出五角双锥体 7 配位。讨论了它们与其他七氟锆酸盐 AIBIIZrF7 以及 β-KYb2F7 的结构关系。RbCaZrF7:a = 6,863 (1) A,b = 11,130 (1) A,c = 8,485 (1) A;TlCaZrF7: