LaS 1.9 , CeS 1.9 , PrS 1.9 , NdS 1.9 und GdS 1.9 : Fünf neue Lanthanoidpolysulfide – Synthese und Kristallstrukturen und ihre Strukturbeziehung zum ZrSSi‐Typ

LaS 1.9 , CeS 1.9 , PrS 1.9 , NdS 1.9 , and GdS 1.9 : Five new Lanthanide Polysulfides – Syntheses, Crystal Structures and their Structural Relationship to the ZrSSi Type Crystals of the five new lanthanide polysulfides LaS 1.9 , CeS 1.9 , PrS 1.9 , NdS 1.9 , and GdS 1.9 have been prepared by different synthetic routes. According to X‐ray structure analyses, the compounds adopt the tetragonal CeSe 1.9 type structure (space group: P 4 2 / n , no. 86) with the lattice parameters a = 9.111(1) Å, c = 16.336(2) Å (LaS 1.9 ), a = 9.015(3) Å, c = 16.168(4) Å (CeS 1.9 ), a = 8.947(3) Å, c = 16.054(4) Å (PrS 1.9 ), a = 8.901(3) Å, c = 16.022(4) Å (NdS 1.9 ), and a = 8.714(1) Å, c = 15.791(1) Å (GdS 1.9 ), respectively. The crystal structure consists of puckered [ Ln S] double slabs and planar sulfur layers alternating along [001]. Each planar sulfur layer contains disulfide dumbbells, isolated anions and ordered vacancies.