| [Visitor (23.83.*.*)]answers [Chinese ] | Time :2020-07-09 | Appearance and characters: colorless or light yellow liquid, with pungent sour taste. Smoke in the air.
Titanium tetrachloride scale model Titanium tetrachloride scale model
Melting point (℃): -25
Relative density (water = 1): 1.73
Boiling point (℃): 136.4
Molecular formula: TiCl4
Molecular weight: 189.71
Saturated vapor pressure (kPa): 1.33 (21.3℃)
Critical temperature (℃): 358
Solubility: soluble in cold water, ethanol and dilute hydrochloric acid.
When heated or exposed to moisture, it liberates heat and emits toxic and corrosive fumes. It has strong corrosiveness.
Titanium tetrachloride is a colorless liquid with high density. When the sample is impure, it is often yellow or reddish brown. Similar to vanadium tetrachloride, it belongs to one of the few transition metal chlorides that is liquid at room temperature. Its low boiling point is related to weak intermolecular forces. Most metal chlorides are polymers, containing metal atoms connected by chlorine bridges, and the intermolecular force of titanium tetrachloride is mainly weak van der Waals force, so the melting boiling point is not high.
The TiCl4 molecule has a tetrahedral structure, and each Ti is connected to four ligands Cl. Ti has the same number of electrons as the rare gas argon and has a closed shell structure. Therefore, the titanium tetrachloride molecule has a regular tetrahedral structure and has a high degree of symmetry.
TiCl4 is soluble in non-polar toluene and chlorinated hydrocarbons. Studies have shown that dissolution in certain aromatic hydrocarbons involves the formation of complexes similar to [(C6R6)TiCl3]. Titanium tetrachloride can react exothermically with Lewis base solvents (such as THF) to form six-coordinated adducts. For larger ligands, the product is a five-coordinate TiCl4L.
In addition to releasing corrosive hydrogen chloride, titanium oxide and oxychloride are generated when TiCl4 is stored, which sticks to the used stoppers and syringes. |
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