Inclusion of HC1 and H2O in the new tunnel type structure (NH4)TeF5(HC1)0.25(H2O)0.25

The structure of the tetrachlorohydroxotellurate(IV) anion in KTeCl4(OH)•0.5H2O and KTeCl4(OH)

“…The non-bonded pair is inactive in the hexacoordinate anions, ~eX6'-(X = C1, Br, I), which all possess an essentially octahedral structure (l,2), except in some cases where hydrogen bonding is important (3). The corresponding hexafluorotellurate(1V) anion is unknown (4,5). The TeF5-ion is square pyramidal (6) and shows no tendency to form condensed ions or to bind a sixth ligand even when a possible ligand (Cl-, H20) is present in the structure (4,7).…”

“…The corresponding hexafluorotellurate(1V) anion is unknown (4,5). The TeF5-ion is square pyramidal (6) and shows no tendency to form condensed ions or to bind a sixth ligand even when a possible ligand (Cl-, H20) is present in the structure (4,7). On the other hand, TeC15-and TeBr5-ions exhibit a pronounced tendency either to polymerize (8)(9)(10) or to attach a sixth ligand to f~r m T e X~~-or TeX5Y-(2-) (11)(12)(13).…”