# Chloride sulfite

A chloride sulfite or sulfite chloride is a chemical compound that contains chloride and sulfite anions (SO$_3$$^{2−}$ Cl$^−$). The known compounds of this type are all late transition metal sulfito complexes. Chlorine may be present as a ligand (chloro) or as an ion (chloride). The sulfito ligand can connect to the metal atom by way of an oxygen, or a sulfur atom. It can also link to the metal atom using two oxygen atoms as a bidentate ligand.
Chloride sulfites are not to be confused with the chlorosulfites, which are compounds containing the SO$_2$Cl$^−$ ion or -SO$_2$Cl group in organic compounds, where it is also called chlorosulfinate. The chlorosulfates also have the formula SO$_3$Cl$^−$ as a single ion, whereas chloride sulfites have three negative charges.
The mercury complex with formula ClHgSO$_3$$^−$ is found in the acid gas scrubbers that purify pollution from smokestacks. However it decomposes and does not capture mercury in this application. This complex can form an ammonium salt: ammonium chlorosulfitomercurate(II) NH$_4$[ClHgSO$_3$], which decomposes over 130°C. The salt is formed from mercuric chloride and ammonium sulfite water solutions.

## List

| name | formula | ratio SO$_3$:Cl | mw | system | space group | unit cell | volume | density | optical |
| chlorosulfito bis-(1,2-diaminopropane)cobalt(III) monohydrate | Co(NH$_2$CH$_2$CH$_2$CH$_2$NH$_2$)$_2$(SO$_3$)Cl·H$_2$O | 1:1 | | | | | | | red brown |
| chlorosulfito bis-(1,2-diaminopropane)cobalt(III) tetrahydrate sodium chloride | Co(NH$_2$CH$_2$CH$_2$CH$_2$NH$_2$)$_2$(SO$_3$)Cl·4H$_2$O·NaCl | 1:1 | | | | | | | brown |
| chlorosulfito (1,2-diaminopropane)(ethylenediamine)cobalt(III) monohydrate sodium chloride | Co(NH$_2$CH$_2$CH$_2$CH$_2$NH$_2$)(NH$_2$CH$_2$CH$_2$NH$_2$)(SO$_3$)Cl·H$_2$O·NaCl | 1:1 | | | | | | | brick red |
| chlorosulfito bis-(ethylenediamine)cobalt(III) monohydrate | [Co(NH$_2$CH$_2$CH$_2$NH$_2$)$_2$(SO$_3$)Cl]·H$_2$O | 1:1 | | | | | | | pink brown |
| ammino sulfito bis-(ethylenediamine)cobalt(III) chloride | [Co(NH$_2$CH$_2$CH$_2$NH$_2$)$_2$(SO$_3$)NH$_3$]Cl | | | | | | | | yellow brown |
| sulfito bis-(ethylenediamine)cobalt(III) chloride | [Co(NH$_2$CH$_2$CH$_2$NH$_2$)$_2$(SO$_3$)]Cl | | | | | | | | brown-red |
| sulfito tetraammino chloro osmium | OsSO$_3$(NH$_3$)$_4$Cl | 1:1 | | | | | | | pink brown |
| | Na$_6$[Os(SO$_3$)$_4$Cl$_2$]·10H$_2$O | 4:2 | | | | | | | purple |
| | Na$_7$[Os(SO$_3$)$_5$Cl]·6H$_2$O | 5:1 | | | | | | | pale violet |
| | K$_8$[Os(SO$_3$)$_4$Cl$_4$] | 4:4 | | | | | | | brown |
| sulfito aquo octaammino μ-nitrido diosmium trichloride | [Os$_2$N(SO$_3$)(NH$_3$)$_8$H$_2$O]Cl$_3$ | 1:3 | | | | | | | yellow brown |
| | Na$_2$[Ir(SO$_3$)$_2$(NH$_4$)$_3$Cl] | 2:1 | | | | | | | |
| trisodium diaquadichlorodisulfitoiridate(III) heptahydrate | Na$_3$[IrCl$_2$(SO$_3$)$_2$(OH$_2$)$_2$]·7H$_2$O | | | | Pnma | Z=4 | | | yellow |
| trisodium disulfito dichloro diammino iridium tetrahydrate | Na$_3$[Ir(SO$_3$)$_2$(NH$_4$)$_2$Cl$_2$]·4H$_2$O | 2:2 | | | | | | | |
| trisodium disulfito dichloro diammino iridium hexahydrate | Na$_3$[Ir(SO$_3$)$_2$(NH$_4$)$_2$Cl$_2$]·6H$_2$O | 2:2 | | | | | | | pale yellow |
| tripotassium diaquadichlorodisulfitoiridate(III) dihydrate | K$_3$[IrCl$_2$(SO$_3$)$_2$(OH$_2$)$_2$]·2H$_2$O | | | | C2 | Z=2 | | | yellow |
| | Na$_5$[Ir(SO$_3$)$_2$Cl$_4$] | 2:4 | | | | | | | |
| pentapotassium disulfito tetrachloro iridium hexahydrate | K$_5$[Ir(SO$_3$)$_2$Cl$_4$]·6H$_2$O | | | | | | | | light orange |
| pentasodium dichlorobis(hydrogendisulfito)iridate(III) | trans-Na$_5$[IrCl$_2${(SO$_3$H)(SO$_3$)}$_2$]·10H$_2$O | | | | C2/c | | | | pale yellow |
| pentapotassium dichlorobis(hydrogendisulfito)iridates(III) | trans-K$_5$[IrCl$_2${(SO$_3$H)(SO$_3$)}$_2$]·5H$_2$O | | | | | | | | pale yellow |
| | Na$_7$[Ir(SO$_3$)$_4$Cl$_2$] | 4:2 | | | | | | | |
| hepta sodium tetrasulfito dichloro iridium heptahydrate | Na$_7$[Ir(SO$_3$)$_4$Cl$_2$]·7H$_2$O | | | | | | | | pale yellow |
| | K$_7$[Ir(SO$_3$)$_2$(NO$_3$)$_2$Cl] | 4:2 | | | | | | | |
| | (NH4)$_5$lr(SO$_3$)$_2$Cl$_4$ | 2:4 | | monoclinic | P2$_1$/n | a = 11.10 b = 7.25 c = 7.25 β= 96.5 Z = 2 | | | |
| | (NH4)$_4$lr(SO$_3$)$_2$Cl$_3$·4H$_2$O | 2:3 | | monoclinic | | a = 10.44 b = 9.46 c = 7.48 β = 90.5, Z = 2 | | | |
| | NH$_4$[ClHgSO$_3$] | 1:1 | | | Pnma | a=15.430 b=5.525 c=6.679 Z=4 | | | |
| | K[HgSO$_3$Cl]·KCl·H$_2$O | 1:2 | 761.18 | triclinc | P1_ | a = 6.1571 b = 7.1342 c = 10.649 α = 76.889, β = 88.364, γ = 69.758° Z=4 | 426.8 | 4.358 | |
| | K[HgSO$_3$Cl]·KCl·HgCl$_2$ | 1:4 | 701.24 | monoclinic | P2$_1$/m | a=9.532 b=5.9593 c=10.176 β =110.522 Z=2 | 541.3 | 4.302 | |
| | K[HgSO$_3$Cl]·HgCl$_2$ | 1:3 | 626.69 | orthorhombic | Cmc2$_1$ | a=5.9313 b=21.746 c=6.7899 Z=4 | 879.79 | 4.753 | |
| | NH$_4$[HgSO$_3$Cl]·HgCl$_2$ | 1:3 | 605.65 | orthorhombic | Cmc2$_1$ | a=5.962 b=22.247 c=6.958 Z=4 | 923.0 | 4.358 | |
| | NH$_4$[HgSO$_3$Cl]·HgCl$_{2·}$NH$_4$Cl | 1:4 | 659.12 | monoclinic | P2$_1$/m | a=9.712 b=6.138 c=10.401 β =110.92 Z=2 | 579.2 | 3.779 | |
| | (K[HgSO$_3$Cl])$_2$·KCl·HgCl$_2$ | 2:5 | 1056.44 | orthorhombic | Pnma | a=22.158 b=5.9736 c=12.249 Z=4 | 1621.2 | 4.328 | |