Uses of coordination compounds (a) Dyes and Pigments Coordination compounds have been used from the earliest times as dyes and pigments, for example madder dye which is red, was used by the ancient Greeks and…

Haemoglobin in the red blood cells carries oxygen from the lungs to the tissues. It delivers the oxygen molecule to myoglobin in the tissues. When the oxygen has been released for cell respiration, haemoglobin loses…

Chlorophyll is a magnesium – porphyrin complex. The magnesium is at the centre of the modified porphyrin ring septeon (corrin). The oxidation state of magnesium is +2 (Mg2+). The modified porphyrin acts as the ligand.…

Nature of haemoglobin and myoglobin Both are having the same structure excepting the fact that myoglobin is a monomer and haemoglobin is a tetramer. Both are iron-porphyrin complex. These are biocoordination complexes formed between porphyrin…

In a bimetallic complex, both complex cation and complex anion may be present. In such a case the distribution of ligands between the two coordination spheres can vary, giving rise to isomers called the coordination…

Linkage isomerism occurs with ambidentate ligands. These ligands are capable of coordinating in more than one way. The best-known cases involve the monodentate ligands SCN-/NCS- and NO2–/ONO– For example [Co(NH3)5ONO]Cl2 the nitrito isomer – red…

The coordination number of a metal ion in a complex can be defined as the number of ligand donor atoms to which the metal is directly bonded. Numerically coordination number represents the total number of…