Synthesis and crystal structure of a new potassium fluorotellurate(IV) : KTe2F9

The cubic [Ti8F36]4− anion found in the crystal structures of K4Ti8F36·8HF and Rb4Ti8F36·6HF

“…It should be added that other examples of compounds with general formula AM 2 F 9 (M = Nh, Te) also exist, however the coordination number around M 4+ is higher than six. 26,27 Metals (M 4+ ) with higher coordination numbers also form compounds such as A 3 MF 7 , A 5 M 2 F 13 , A 5 M 4 F 21 , A 7 M 6 F 31 (M = Zr, Hf), etc. 28 Notes and references…”

The low-temperature barium fluoridozirconate variety α-BaZr2F10

“…6c) transforms this description to a stacking of Ba 2+ cations and zigzag layers of TeF 5+3 polyhedra, analogous but not identical to both BaZr 2 F 10 varieties. KTe 2 F 9 (Guillet et al, 1997), can also, in the same way, be considered as a stacking of double layers of TeF 5+1 and TeF 5+3 polyhedra separated by K + sheets (Fig. 7a).…”

Synthese und Kristallstruktur von KTeOF3

“…As a characteristic feature, the compound contains unprecedented dimeric anions Te 2 [14] weisen diese eine schwache Verbru È ckung zu pseudo-trigonal-bipyramidalen TeF 4 -Einheiten auf. KTeOF 3 has been synthesized by solid state reaction of KF, TeO 2 and KTeF 5 in equimolar amounts.…”