Neue Alkalimetall‐halogenopalladate(II) mit Iodeinlagerung — Kristallstrukturen,Phasenübergänge und Spektroskopie

New Alkaline Halogenopalladates(II) with Incorporated Iodine Dumb‐Bells — Crystal Structures, Phase‐Transitions, and Vibrational Spectra Dark‐reddish crystals of Cs₂PdBr₄]I₂, Cs₂PdCl₄]I₂, and black crystals of Rb₂PdBr₄]I₂ were obtained by solvothermal reaction from diluted hydrohalogenic acids and crystallize in space group I4/mmm with Z = 2. Unitcell parameters for Cs₂PdBr₄]I₂ are a = 848.96(1) pm, c = 908.53(2) pm; Cs₂PdCl₄]I₂ a = 814.65(2) pm, c = 899.10(1) pm and for Rb₂PdBr₄]I₂ a = 840.9(1) pm, c = 902.3(1) pm. The compounds contain isolated PdX₄] building units (X = Cl, Br) which are supplemented by embedded iodine dumb‐bells. Cs₂PdBr₄]I₂ and Cs₂PdCl₄]I₂ show reversible pressure induced phase transitions above 78 kbar and 199 kbar, respectively.