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The two new scandium oxotellurates(IV) Sc 2 Te 3 O 9  and Sc 2 Te 4 O 11  were synthesized through firing appropriate mixtures of Sc 2 O 3 , TeO 2  and CsBr (as flux) in evacuated glassy silica ampoules at 850 °C for 10 days. Both of them crystallize in the monoclinic space group  P 2 1 / c  with  Z  = 4 (Sc 2 Te 3 O 9 :  a  = 523.36(3),  b  = 2438.23(14),  c  = 731.98(4) pm,  β  = 116.221(3)°; Sc 2 Te 4 O 11 :  a  = 949.51(6),  b  = 779.12(5),  c  = 1341.93(9) pm,  β  = 90.829(3)°). Both crystal structures contain two crystallographically unique Sc 3+  cations. In the case of Sc 2 Te 3 O 9 , they reside in six- and sevenfold oxygen coordination arranged as distorted uncapped or capped octahedra, while for Sc 2 Te 4 O 11 , they only exhibit six oxygen atoms in the coordination polyhedra, but one of them has also a certain tendency to thrive for a higher coordination number (C.N. = 6 + 1). The [(Sc1)O 6 )] 9−  and [(Sc2)O 6+1 )] 11−  polyhedra in Sc 2 Te 3 O 9  are condensed via common edges to form serrated    ∞   1{[Sc   2O6   /   1tO1   /   2vO4   /   2e]11   −}${\text{&amp;#x2008;}}_{\infty }^{1}\left\{{\left[{\text{Sc}}_{2}{\text{O}}_{6\text{/}1}^{\text{t}}{\text{O}}_{1\text{/}2}^{\text{v}}{\text{O}}_{4\text{/}2}^{\text{e}}\right]}^{11-}\right\}$chains running along [100], whereas the two [ScO 6 ] 9−  octahedra in Sc 2 Te 4 O 11  only share common vertices, generating    ∞   1{[Sc   2O6   /   1tO3   /   2v]9   −}${\text{&amp;#x2008;}}_{\infty }^{1}\left\{{\left[{\text{Sc}}_{2}{\text{O}}_{6\text{/}1}^{\text{t}}{\text{O}}_{3\text{/}2}^{\text{v}}\right]}^{9-}\right\}$double strands along [010]. In both compounds, the three-dimensional framework and the charge balance are accomplished by the discrete ψ 1 -tetrahedral [TeO 3 ] 2−  anions with non-bonding lone-pair electrons located at their central Te 4+  cations. Moreover, strong secondary Te 4+ ···O 2−  interactions, which are generally quite common for rare earth metal(III) oxotellurates(IV), occur in both crystal structures, but much more pronounced in Sc 2 Te 4 O 11 , where three quarters of the Te 4+  cations reside in the centers ofψ   eq   1${{\psi}}_{\text{eq}}^{1}$-trigonal bipyramids [TeO 4 ] 4−  as compared to Sc 2 Te 3 O 9 , which can well be written as Sc 2 [TeO 3 ] 3 .

Synthesis and crystal structure of two scandium oxotellurates(IV): Sc 2 Te 3 O 9 and Sc 2 Te 4 O 11