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All representatives of the isotypic series  Ln Sb 2 O 4 Cl ( Ln  = Gd–Lu) could be obtained as single crystals, which crystallize just like the prototypic YSb 2 O 4 Cl in the non-centrosymmetric tetragonal space group  P 42 1 2. The steady decrease in lattice parameters from  a  = 781.08(4) pm and  c  = 881.47(6) pm for GdSb 2 O 4 Cl to  a  = 764.66(4) pm and  c  = 877.53(7) pm for LuSb 2 O 4 Cl reflect the consequences of the lanthanide contraction, as expected. The  Ln   3+  cations reside in the surrounding of eight oxygen atoms arranged as square hemiprisms [ Ln O 8 ] 13− , which are linked by four of their coplanar edges to form layers according to2∞{[L   nO8   /   2e]5   −}$\begin{array}{l}2\hfill \\ \infty \hfill \end{array}\left\{{\left[Ln{\text{O}}_{8/2}^{e}\right]}^{5-}\right\}$parallel to the (001) plane. The Sb 3+  cations form ψ 1 -tetrahedral [SbO 3 ] 3–  anions together with three oxygen atoms. Two of these anions are connected with additional Sb 3+  cations, but the third one shows no extra connectivity. Four ψ 1 -tetrahedral [SbO 3 ] 3–  units build an eight-membered ring0∞{[Sb   4O   8]4   −}$\begin{array}{l}0\hfill \\ \infty \hfill \end{array}\left\{{\left[{\text{Sb}}_{4}{\text{O}}_{8}\right]}^{4-}\right\}$. These isolated rings are arranged parallel to the (001) plane. Between the oxygen-connected triple layers of  Ln   3+  and Sb 3+  cations with the composition2∞{[L   nSb   2O   4]+}$\begin{array}{l}2\hfill \\ \infty \hfill \end{array}\left\{{\left[Ln{\text{Sb}}_{2}{\text{O}}_{4}\right]}^{+}\right\}$there are single layers of Cl −  anions, not connected strongly to any of the trications. Due to the presence of isolated cyclic [Sb 4 O 8 ] 4–  anions, these lanthanoid(III) oxidoantimonate(III) chlorides  Ln Sb 2 O 4 Cl ( Z  = 4) can also be described with the molecular formula  Ln   2 [Sb 4 O 8 ]Cl 2  ( Ln  = Gd–Lu) for  Z  = 2.

Die Reihe der nicht-zentrosymmetrischen tetragonalen Lanthanoid(III)-Oxidoantimonat(III)-Chloride Ln Sb 2 O 4 Cl ( Ln = Gd–Lu)