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Encyclopedia > Titanium tetraiodide
Titanium tetraiodide
Image:Titanium tetraiodide.jpg
Systematic name Titanium(IV) iodide
Other names Titanium tetraiodide
Molecular formula TiI4
Molar mass 555.49 g/mol
Appearance red-brown crystals
CAS number [7720-83-4]
Density and phase 4.3 g/cm3
Solubility in water hydrolysis
Other solvents CH2Cl2
Melting point 150 °C
Boiling point 377°C
Crystal structure cubic (a = 12.21 Å)
Dipole moment 0 D
MSDS External MSDS
Main hazards violent hydrolysis
NFPA 704
R/S statement R: 34-37
S: 26-36/37/39-45
RTECS number  ?
Supplementary data page
Structure and
n, εr, etc.
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Related compounds
Related ?  ?
Related compounds titanium tetrachloride,
carbon tetraiodide,
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Titanium tetraiodide is TiI4. It is a rare molecular binary metal iodide, consisting of isolated molecules of tetrahedral Ti(IV) centers; the other example is Ta2I10. Reflecting its molecular character, TiI4 can be distilled without decomposition at one atmosphere. The compound is a close relative to TiCl4. The difference in melting point between TiCl4 (m.p. -24 °C) and TiI4 (m.p. 150 °C) is comparable to the difference between the melting points of CCl4 (m.p. -23 °C) and CI4 (m.p. 168 °C), reflecting the stronger intermolecular van der Waals bonding in the iodides. IUPAC nomenclature is a system of naming chemical compounds and of describing the science of chemistry in general. ... A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... The simplified molecular input line entry specification or SMILES is a specification for unambiguously describing the structure of chemical molecules using short ASCII strings. ... Molar mass is the mass of one mole of a chemical element or chemical compound. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences, mixtures and alloys. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i. ... A substance is soluble in a fluid if it dissolves in that fluid. ... Water has the chemical formula H2O, meaning that one molecule of water is composed of two hydrogen atoms and one oxygen atom. ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ... The boiling point of a substance is the temperature at which it can change its state from a liquid to a gas throughout the bulk of the liquid at a given pressure. ... The coordination geometry of an atom is the geometrical pattern formed by its neighbors in a molecule or a crystal. ... Rose des Sables (Sand Rose), formed of gypsum crystals In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... The Earths magnetic field, which is approximately a dipole. ... The debye (symbol: D) is a non-SI and non-CGS unit of electrical dipole moment. ... A material safety data sheet or MSDS is a form containing data regarding the properties of a particular substance. ... Worker safety and health is the prevention and reduction of the number of occupational safety and health hazards at the places of employment, providing safe and healthful working conditions. ... NFPA 704 is a standard maintained by the U.S. National Fire Protection Association. ... Risk and Safety Statements, also known as R/S statements, R/S numbers, R/S phrases, and R/S sentences, is a system of hazard codes and phrases for labeling dangerous chemicals and compounds. ... R-phrases are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous substances and preparations. ... S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. ... RTECS, also known as Registry of Toxic Effects of Chemical Substances, is a database of toxicity information compiled from the open scientific literature that is available for charge. ... The refractive index of a material is the factor by which the phase velocity of electromagnetic radiation is slowed relative to vacuum. ... The dielectric constant εr (represented as or K in some cases) is defined as the ratio: where εs is the static permittivity of the material in question, and ε0 is the vacuum permittivity. ... Ultraviolet-Visible Spectroscopy or Ultraviolet-Visible Spectrophotometry (UV/ VIS) involves the spectroscopy of photons (spectrophotometry). ... IR spectrum of a thin film of liquid ethanol. ... Nuclear Magnetic Resonance Spectroscopy most commonly known as NMR Spectroscopy is the name given to the technique which exploits the magnetic properties of nuclei. ... It has been suggested that Mass spectrum be merged into this article or section. ... A question mark is a punctuation mark. ... Titanium tetrachloride (TiCl4) is used for commercial production of pure titanium metal. ... Carbon tetraiodide is CI4. ... General Name, Symbol, Number iodine, I, 53 Chemical series halogens Group, Period, Block 17, 5, p Appearance violet-dark gray, lustrous Atomic mass 126. ... In chemistry, the standard state of a material is its state at 1 bar (100 kilopascals) and 25 degrees Celsius (298. ... Titanium tetrachloride (TiCl4) is used for commercial production of pure titanium metal. ... R-phrases , , , , S-phrases , , , , , Flash point non flammable RTECS number FG4900000 Supplementary data page Structure and properties n, εr, etc. ... Carbon tetraiodide is CI4. ...



Three methods are well known: 1) From the elements, typically using a tube furnace at 425 °C:

Ti + 2 I2 → TiI4

This reaction can be reversed to produce highly pure films of Ti metal. 2) Exchange reaction from titanium tetrachloride and HI. Titanium tetrachloride (TiCl4) is used for commercial production of pure titanium metal. ...

TiCl4 + 4 HI → TiI4 + 4 HCl

3) Oxide-iodide exchange from aluminuim triiodide.

3 TiO2 + 4 AlI3 → 3 TiI4 + 2 Al2O3


Like TiCl4, TiI4 forms adducts with Lewis bases, and it can also be reduced. When the reduction is conducted in the presence of Ti metal, one obtains polymeric Ti(III) and Ti(II) derivatives such as CsTi2I7 and the chain CsTiI3, respectively. As a solution in CH2Cl2, TiI4 exhibits some reactivity toward alkenes and alkynes resulting in organoiodine derivatives.




  • Blumenthal WB, Smith H (1950). "Titanium tetraiodide, Preparation and Refining". Industrial and Engenieering Chemistry 2: 249. DOI
  • Tornqvist EGM, Libby WF (1979). "Crystal Structure, Solubility, and Electronic Spectrum of Titanium Tetraiodide". Inorganic Chemistry 18: 1792. DOI
  • Lowery, R. N.; Fay, R. C. "Titanium(IV) Iodide" Inorganic Syntheses 1967, volume X, pages 1-6.
  • Shimizu, Makoto; Toyoda, Tadahiro; Baba, Toru. An Intriguing Hydroiodination of Alkenes and Alkynes with Titanium Tetraiodide. Synlett 2005, volume 16, pages 2516-2518.
  • Jongen, L.; Gloger, T.; Beekhuizen, J.; Meyer, G. "Divalent titanium: The halides ATiX3 (A = K, Rb, Cs; X = Cl, Br, I)" Zeitschrift fur Anorganische und Allgemeine Chemie 2005, volume 631, pages 582-586.



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