Crystal structure of disamarium undecaoxotetratellurate(IV), Sm2Te4O11

DiscussionSm2Te40 nis isostructuial with LnjYeiP \ ι (Ln = La -Lu) [ 1,2].Detailed structural features were reported in the single crystal studies for P^T^On [3], Nd2Te40n [4], Ho^On [5] and Er 2 Te 4 0n [6].The SmOg coordination polyhedron shows a distorted square antiprism, so as to form a polyhedral sheet parallel to the (001) plane.The Sm-Ο distances range from 2.335(5) Ä to 2.580(5) A. The averaged distance of 2.437 Ä in the SmOs coordination is comparable with those for Pr-Ο (2.473 A), Nd-Ο (2.460 A), Ho-Ο (2.379 A) and Er-Ο (2.364 A), when the lanthanoide contraction is considered.Tel is coordinated to three shorter distances of 1.831(4) A, 1.883(4)Aand 1.996(2) Aanda longer distance at 2.406(5) A. Similar coordination feature was observed in the Te2 environment with the distances of 1.869(4) A, 1.870(5) A, 1.887(5) A and 2.673(5) A. The Te0 4 polyhedra are linked by sharing their corners to form the 'lone pair miscell' running parallel to the b axis.The bond valence calculation [7] supports the coordination of Te(IV) in the title compound.

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