|Jmol-3D images||Image 1|
|Molar mass||260.50 g/mol (anhydrous)
350.60 g/mol (pentahydrate)
|Appearance||colorless fuming liquid|
|Density||2.226 g/cm3 (anhydrous)
2.04 g/cm3 (pentahydrate)
|Melting point||−34.07 °C (−29.33 °F) (anhydrous)
56 °C (133 °F) (pentahydrate)
|Boiling point||114.15 °C (237.47 °F; 387.30 K)|
|Solubility in water||decomposes (anhydrous)
very soluble (pentahydrate)
|Solubility||soluble in alcohol, benzene, toluene, chloroform, acetone, kerosene, CCl4, methanol, gasoline, CS2|
|Refractive index (nD)||1.512|
|Crystal structure||monoclinic (P21/c)|
|EU classification||Corrosive (C)|
|S-phrases||(S1/2), S7/8, S26, S45, S61|
|Other anions||Tin(IV) fluoride
|Other cations||Carbon tetrachloride
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)|
|(what is: / ?)|
Tin(IV) chloride, also known as tin tetrachloride or stannic chloride is a chemical compound with the formula SnCl4. At room temperature it is a colourless liquid, which fumes on contact with air, giving a stinging odor. It was first discovered by Andreas Libavius (1550–1616) and was known as "spiritus fumans libavii".
- Sn + 2 Cl2 → SnCl4
Tin(IV) chloride solidifies at −33 °C to give monoclinic crystals with the P21/c space group; making it isostructural to solidified SnBr4. Within this the molecules adopt near perfect tetrahedral symmetry with average Sn–Cl distances of 227.9(3) pm.
When mixed with a small amount of water a semi-solid crystalline mass of the pentahydrate, SnCl4.5H2O is formed. This was formerly known as butter of tin. This compound has been shown to be best described as [SnCl4(H2O)2].3H2O, consisting of cis-[SnCl4(H2O)2] units linked in chains with three hydrate water molecules. Several lower hydrates have also been characterised.
With hydrochloric acid the complex [SnCl6]2− is formed making the so-called hexachlorostannic acid.
Anhydrous tin(IV) chloride is a strong Lewis acid and complexes with e.g. ammonia, phosphine and phosphorus pentachloride are known. SnCl4 is used in Friedel-Crafts reactions as a catalyst for homogeneous alkylation and cyclisation.
- SnCl4 + RMgCl → SnR4 + MgCl2
Stannic chloride was used as a chemical weapon in World War I, as it formed an irritating (but non-deadly) dense smoke on contact with air: it was substituted for by a mixture of silicon tetrachloride and titanium tetrachloride near the end of the War due to shortages of tin. It is also used in the glass container industry for making an external coating containing tin(IV) oxide which toughens the glass. It is a starting material for organotin compounds.
Stannic chloride is used in chemical reactions with fuming (90%) nitric acid for the selective nitration of activated aromatic rings in the presence of unactivated ones.
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- Reuter, Hans; Pawlak, Rüdiger (April 2000). "Die Molekül- und Kristallstruktur von Zinn(IV)-chlorid". Zeitschrift für anorganische und allgemeine Chemie (in German) 626 (4): 925–929. doi:10.1002/(SICI)1521-3749(200004)626:4<925::AID-ZAAC925>3.0.CO;2-R.
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