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Violet single crystals of NdClSeO 3  (Pnma, Z = 8, a = 1115.3(2), b = 535.19(6), c = 1356.8(1) pm, R all  = 0.0281) were obtained from the reaction of Nd 2 O 3 , NdCl 3 , and SeO 2  in evacuated silica ampoules. The analogous procedure using Er 2 O 3  and ErCl 3  led to pink single crystals of ErClSeO 3  (Pnma, Z = 4, a = 721.8(1), b = 692.2(1), c = 874.3(2) pm, R all  = 0.0305). The crystal structure of NdClSeO 3  contains two crystallographically different neodymium ions. Nd(2) 3+  is coordinated by four oxygen atoms and four chloride ions while eight oxygen atoms and one Cl −  ion are connected to Nd(1) 3+ . The linkage of the polyhedra leads to a three-dimensional structure. In the structure of ErClSeO 3  the Er 3+  ion is coordinated by two Cl −  ions, three O-monodentate SeO 3  2−  and one O,O-chelating SeO 3  2−  groups. The [ErO 5 Cl 2 ] polyhedra can be seen as pentagonal bipyramids, which are connected in the [010] direction via opposite edges of oxygen atoms to infinite chains. These are further linked via chloride ions to give a three-dimensional network. In both crystal structures a prominent stereochemical activity of the lone electron pairs of the selenite ions can be observed.

NdClSeO 3 and ErClSeO 3 : First Chloride-Selenites of the Rare Earth Elements