Titantetrafluorid – Eine überraschend einfache Kolumnarstruktur

Abstract

Durch Solvothermalsynthese in wasserfreier HF gelang es endlich erstmals, TiF4 aus (O2)2Ti7F30 in Form solcher Einkristalle darzustellen, die eine Strukturbestimmung ermöglichten. Die farblosen, transparenten Nadeln kristallisieren in der Raumgruppe Pnma–D 2h16 (Nr. 62) mit a = 2 281,1, b = 384,8, c = 956,8 pm, Z = 12. TiF4 bildet einen eigenen Strukturtyp, dessen charakteristisches Merkmal von einander isolierte, aus TiF6‐Oktaedern aufgebaute Säulen sind (Kolumnarstruktur).

Syntheses and Crystal Structures of New ReO3‐Type‐Derived Transition Metal Oxide Fluorides

“…The average bond length between Ti/Fe and the anions is 191.2 pm. This value is similar to the calculated one from FeF 3 (192.3 [22] ), TiF 4 (187.4 pm [9] ), and Fe 2 TiO 5 (201.2 pm [23] ): 191.8 pm. It should be mentioned that no statement concerning the Fe/Ti distribution can be made respecting the used X-ray powder methods.…”

“…187.4 [9] a) Values taken from (1) in combination with a small deviation of the anions from their ideal position (now x,0,0 with x ≈ ¼) is usually described in space group Fm3m, a klassengleiche subgroup of Pm3m with a doubled lattice parameter a. During thermal treatment of above-described MgTi 2 OF 8 (ReO 3 -type structure, space group Pm3m) in inert gas atmosphere or vacuum at 200°C for 2 h a phase transformation www.zaac.wiley-vch.de ARTICLE Dedicated Cluster was observed.…”

“…Again, for reasons of clarity also the formula corresponding to the ReO 3 type is given. The average bond lengths between the metals and the surrounding anions are given in [8] 187.4 [9] 195.6 [10] MgZr 2 OF 8 …”

Synthesis and Characterisation of [XeF5]3[Ti4F19] Containing a Discrete [Ti4F19]3– Anion

“…The Xray powder diffraction pattern and Raman spectrum of isolated TiF 4 were in agreement with the literature data. [35,36] Xenon difluoride was prepared by the photochemical reaction between Xe and F 2 at ambient temperature. [37] Raman Spectroscopy: Raman spectra were recorded with a Renishaw Raman Imaging Microscope System 1000 by using a He-Ne laser with a wavelength of 632.8 nm.…”

Structural chemistry of fluoride and oxofluoride complexes of titanium(IV)

“…The crystal structure of (O 2 ) 2 Ti 7 F 30 [75] has some similarity to that of TiF 4 [76]. Just like …”