Coordination isomerism.

K₃[Fe(C₂O₄)₃]

Tetraammine copper (II) sulphate.

Diammine silver (I) Chloride.

Cu₂[Fe(CN)₆]

Ligand is an atom or a group of atoms which is either negatively charged or has lone pair of electrons and from co-ordinate bond with the central metal or ion, e.g.H₂O.

Hexaqua Nickel Chloride

Sodium tetrafluoridodihydroxychromate (III) Na[CrF₄(H₂O)₂]

(i) EDTA is used in the treatment of lead poisoning
(ii) Cis-platin[Pt(NH₃)₂Cl₂] is used in the treatment of cancer.

Six

Monochloro is (ethane-1, 2-diamine) nitrito- K O Cobalt (III) chloride.

K₃[CoF₆]

\({ Ag }^{ + }2N{ H }_{ 3 }\rightleftharpoons { \left[ { Ag\left( { { NH }_{ 3 } } \right) }_{ 2 } \right] }^{ + }\)
\(k=\frac { { \left[ { Ag\left( { { NH }_{ 3 } } \right) }_{ 2 } \right] }^{ + } }{ \left[ { Ag }^{ + } \right] { \left[ { NH }^{ 3+ } \right] }^{ 2 } } \)
\(=\frac { \left[ { Ag }^{ + } \right] }{ { \left[ { Ag\left( { NH }_{ 3 } \right) }_{ 2 } \right] }^{ + } } =\frac { 1 }{ k{ \left( { NH }_{ 3 } \right) }^{ 2 } } \)
\(=\frac { 1 }{ 1.7\times { 10 }^{ 7 }\times { \left( 0.2 \right) }^{ 2 } } =\frac { { 10 }^{ -7 } }{ 1.7\times 4\times { 10 }^{ -2 } } \)
\(=\frac { { 10 }^{ -5 } }{ 6.8 } =1.47\times { 10 }^{ -5 }\)

In [CuCI₄]^-2 Cu²⁺, is reduced to Cu⁺ by I^-. Hence Cupric Iodide in converted to cuprous Iodide so [CuI₄]^-2 does not exist. In [CuCI₄]^-2 Cl^- cannot effect this change and so exists.

Addition of an alcoholic solution of dimethylglyoxime to an ammoniacal solution of Ni(II) gives rose - red precipitate Ni[ONCC N OH]₂ Nickel Cis (dimethylglyoximate)