Copper is a chemical element with the symbol Cu (from Latin: cuprum) and the atomic number of 29. It is easily recognisable, due to its distinct red-orange color. Copper also has a range of different organic and inorganic salts, having varying oxidation states ranging from (0,I) to (III). These salts (mostly the (II) salts) are often blue to green in color, rather than the orange color copper is known for. Despite being considered a semi-noble metal, copper is one of the most common salt-forming transition metals, along with iron.

Copper(0,I) salts

Name Chemical Formula Anion Image
Copper silicide Cu5Si Silicide (silane)

Copper(I) salts

Name Chemical Formula Anion Image
Copper(I) oxide Cu2O Oxide (oxygen)
Copper(I) chloride CuCl Chloride (hydrochloric acid)
Copper(I) iodide CuI Iodide (hydroiodic acid)
Copper(I) cyanide CuCN Cyanide (hydrocyanic acid)
Copper(I) thiocyanate CuSCN Thiocyanate (thiocyanic acid)
Copper(I) sulfate Cu2SO4 Sulfate (sulfuric acid)
Copper(I) sulfide Cu2S Sulfide (hydrogen sulfide)
Copper(I) acetylide Cu2C2 Acetylide (acetylene)
Copper(I) bromide CuBr Bromide (hydrobromic acid)
Copper(I) fluoride CuF Fluoride (hydrofluoric acid)
Copper(I) hydroxide CuOH Hydroxide (water)
Copper(I) hydride CuH Hydride (hydrogen gas)
Copper(I) nitrate CuNO3 Nitrate (nitric acid)
Copper(I) phosphide Cu3P Phosphide (phosphine)
Copper(I) thiophene-2-carboxylate C5H3CuO2S thiophene-2-carboxylate (thiophene-2-carboxylic acid)
Copper(I) t-butoxide C16H36Cu4O4 t-butoxide (t-butyl alcohol)

Copper(II) salts

Name Chemical Formula Anion Image
Copper(II) sulfate CuSO4 Sulfate (sulfuric acid)
Copper(II) chloride CuCl2 Chloride (hydrochloric acid)
Copper(II) hydroxide Cu(OH)2 Hydroxide (water)
Copper(II) nitrate Cu(NO3)2 Nitrate (nitric acid)
Copper(II) oxide CuO Oxide (oxygen)
Copper(II) acetate Cu(OAc)2 Acetate (acetic acid)
Copper(II) fluoride CuF2 Fluoride (hydrofluoric acid)
Copper(II) bromide CuBr2 Bromide (bromine)
Copper(II) carbonate CuCO3 Carbonate (carbonic acid)
Copper(II) carbonate hydroxide Cu2CO3(OH)2 Hydroxide (water)

Carbonate (carbonic acid)
Copper(II) chlorate Cu(ClO3)2 Chlorate (chloric acid)
Copper(II) arsenate Cu3(AsO4)2 Arsenate (arsenic acid)
Copper(II) azide Cu(N3)2 Azide (hydrazoic acid)
Copper(II) acetylacetonate Cu(O2C5H7)2 Acetylacetonate (acetylacetone)
Copper(II) aspirinate C36H28Cu2O16 Acetylsalicylate (acetylsalicylic acid)
Copper(II) cyanurate CuC3HN3O3 Cyanurate (cyanuric acid)
Copper(II) glycinate Cu(H2NCH2CO2)2 Glycinate (glycine)
Copper(II) phosphate Cu3(PO4)2 Phosphate (phosphoric acid)
Copper(II) perchlorate Cu(ClO4)2 Perchlorate (perchloric acid)
Copper(II) selenite CuSeO3 Selenite (selenous acid)
Copper(II) sulfide CuS Sulfide (hydrogen sulfide)
Copper(II) thiocyanate Cu(SCN)2 Thiocyanate (thiocyanic acid)
Copper(II) triflate Cu(OSO2CF3)2 Triflate (triflic acid)
Copper(II) tetrafluoroborate Cu(BF4)2 Tetrafluoroborate (tetrafluoroboric acid)
Copper(II) acetate triarsenite

(Paris Green)

 Cu(C2H3O2)2·3Cu(AsO2)2 Acetate (acetic acid)

Triarsenite (1,3,5,2,4,6-Trioxatriarsinane-2,4,6-triol)
Copper(II) benzoate Cu(C6H5CO2)2 Benzoate (benzoic acid)
Copper(II) arsenite

(Scheele's Green)

 CuHAsO3 Arsenite (Arsenous acid)
Copper(II) chromite Cu2Cr2O5 Chromite (chromic acid)
Copper(II) gluconate C12H22CuO14 Gluconate (gluconic acid)
Copper(II) peroxide CuO2 Peroxide (hydrogen peroxide)
Copper(II) usnate C18H14CuO7 Usnate (usnic acid)
Copper(II) oxychloride Cu2(OH)3Cl Hydroxide and chloride
Copper(II) naproxen C28H26CuO6 naproxen
Copper(II) ibuprofenate C52H68Cu2O8 Ibuprofenate (ibuprofen)

Copper(I, II) salts

Name Chemical Formula Anion Image
copper(I,II) sulfite dihydrate

(Chevreul's salt)

 Cu3(SO3)2·2H2O Sulfite (Sulfurous acid) სპილენძ (I, II) სულფიტი დიჰიდრატი

Copper(III) salts

Name Chemical Formula Anion Image
Copper(III) oxide Cu2O3 Oxide (oxygen)

See also

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