(a)

[Co(NH3)6]Cl3 

Prepared in 1798 by B.M. Tassaert and considered to be first complex salt prepared.

(b)

[Rh(NH3)5I]I2 

A yellow colored complex obtained by heating [Rh(NH3)5(H2O)]I3 above 1000C.

(c)

[Fe(CO)5] 

A highly toxic volatile liquid.

(d)

[Fe(C2O4)3]3– 

The ion formed when Fe2O3 rust is dissolved in oxalic acid, H2C2O4.

(e)

[Cu(NH3)4]SO4 

A deep blue compound obtained when CuSO4 is treated with excess of NH3.

(f)

Na[Cr(OH)4] 

The compound formed when Cr(OH)3 precipitate is dissolved in excess of NaOH.

(g)

[Co(gly)3] 

A complex that contains the anion of amino acid, glycine.

(h)

[Fe(H2O)5(SCN)]2+ 

The red complex ion formed in the qualitative analysis test of Fe3+ ion.

(i)

K2[HgI4]

Alkaline solution of this complex is called Nessler’s Reagent.

(j)

Co[Hg(SCN)4]

Deep blue crystalline precipitate obtained in qualitative detection of Hg2+.

(k)

Fe4[Fe(CN)6]3

Prussian blue, deep blue colored complex obtained in detection of Fe2+.

(l)

K3[Co(NO2)6]

Potassium cobaltinitrite or Fischer salt yellow precipitate obtained in detection of Co2+.

(m)

[Ni(dmg)2]

Rosy red precipitate obtained in detection of Ni2+ ions.

(n)

K2[PtCl6]

Yellow precipitate obtained in detection of potassium ions.

(o)

Na2[Fe(CN)5NO+]

Sodium nitroprusside used for detection of sulphide ions/sulphur.

(p)

[Fe(H2O)5(NO+)]SO4

Brown ring complex, obtained in detection of Fe+1 ions.

(q)

[Cu(CN)4]3–

Colourless stable soluble complex obtained in detection of Cu2+ on adding excess of KCN solution.

(r)

(NH4)2[PtCl6]

Only few compounds of ammonium ions are precipitate this is one of these, a yellow precipitate.