Crystal structure of WI4

A New Modification of TeI4 Possessing the Crystal Structure Proposed for WI4

“…5 After the discovery of trigonal cluster compounds W 3 I 8 •nI 2 , their successive transformation reactions into tetrahedral, squarepyramidal, and octahedral clusters were explored by thermal scanning to investigate the binary tungsten iodine system in more detail, resulting in the discovery of more than 15 binary tungsten iodides that have been structurally characterized. 6 The unusually high preparation temperature reported for WI 4 (520 °C) 2 was also commented upon in this work. 6 This feature and the close structural relationship between the reported crystal structure of WI 4 and that of δ-TeI 4 gave cause to screen the given reaction between WTe 2 and I 2 in detail.…”

“…1 A similar type of reaction was reported for the preparation of WI 4 by exposure of WTe 2 to iodine. 2 Studies on binary tungsten iodides were reported more than 100 years ago, including the preparation of WI 4 from a reaction of WCl 6 with HI at 110 °C. 3,4 A convenient synthesis of tungsten iodides W 3 I 8 •nI 2 (n = 0, 1, 2) was developed more recently from a reaction of WCl 6 and SiI 4 at 120 °C.…”

Synthesis of (TeI3)2[W6I14] via Iodination of WTe2

“…Our interest in the iodination of WTe 2 was stimulated by a recent report on the observation of binary WI 4 from this reaction. [1] Nearly twenty phases have been reported to exist in the binary W-I system and a little less being confirmed. [2] Tungsten iodides are thermally labile on heating because they are known to undergo self-reduction by release of I 2 .…”

“…[3] The successive reduction of WX 6 (X = Cl, Br) with reducing agents also leads to W 6 X 12 . [4] Surprisingly enough, the preparation of WI 4 was reported from a reaction at 520°C [1] where octahedral tungsten iodide clusters are already formed. The preparation of the herein reported (TeI 3 ) 2 [W 6 I 14 ] from WTe 2 and I 2 at 250°C represents an unexpected low formation temperature for an octahedral tungsten iodide cluster.…”

“…Our interest in the iodination of WTe 2 was stimulated by a recent report on the observation of binary WI 4 from this reaction . Nearly twenty phases have been reported to exist in the binary W–I system and a little less being confirmed .…”