Tris(4-bromophenyl)ammoniumyl hexachloroantimonate

Tris(4-bromophenyl)ammoniumyl hexachloroantimonate is the organic compound with the formula [(4-BrC₆H₄)₃N]SbCl₆.^[1] Commonly known as magic blue, it is the hexachloroantimonate salt of an amine radical cation. It is a blue solid that reacts with many solvents but is soluble in acetonitrile. The compound is a popular oxidizing agent in organic and organometallic chemistry, with a reduction potential of 0.67 V versus ferrocene/ferrocenium (acetonitrile solution) or 0.70 V versus ferrocene/ferrocenium (dichloromethane solution).^[2]

Tris(4-bromophenyl)ammoniumyl hexachloroantimonate

Identifiers
CAS Number	24964-91-8 salt 37881-41-7 cation
3D model (JSmol)	Interactive image
ChemSpider	21493919
PubChem CID	16688313
InChI InChI=1S/C18H12Br3N.6ClH.Sb/c19-13-1-7-16(8-2-13)22(17-9-3-14(20)4-10-17)18-11-5-15(21)6-12-18;;;;;;;/h1-12H;6*1H;/q+1;;;;;;;+5/p-6 Key: SDHBPVANTRLAKE-UHFFFAOYSA-H
SMILES C1=CC(=CC=C1[N+](C2=CC=C(C=C2)Br)C3=CC=C(C=C3)Br)Br.Cl[Sb-](Cl)(Cl)(Cl)(Cl)Cl
Properties
Chemical formula	[(p-BrC6H4)3N•]+[SbCl6]−
Molar mass	816.47 g·mol−1
Appearance	blue solid
Melting point	141 to 142 °C (286 to 288 °F; 414 to 415 K)
Solubility in water	acetonitrile
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

The structure of the cation consists of a three-bladed propeller structure with a planar amine. It is nearly identical to the parent triphenylamine. The weakly coordinating anion is SbCl⁻
₆, which is octahedral.^[3]

Related compounds

• Magic green, tris(2,4-dibromophenyl)ammoniumyl hexachloroantimonate,^[4]