Synthesis, Characterization and Applications of Vanadium Metal Complexes

Introduction:a) Coordination Chemistry: It is branch of chemistry which deals with the study of Coordination Compounds. Complexes or Coordination compounds are molecules that poses a metal center that is bound to ligands (atoms, ions, or molecules that donate electrons to the metal). These complexes can be neutral or charged. When the complex is charged, it is stabilized by neighboring counter-ions. The center metal atom usually consists of transition metals which are located in d block in modern periodic table e.g V, Cr, Mn etc. A complex ion is an ion in which a metal cation is attached to ligands by coordinate bonds. In the structural formula of a coordination compound, the central metal cation or atom and the ligands attached to it are written in a square bracket, [] which is called a coordination sphere. The cation or anion outside the coordination sphere is called the ionization sphere or counter ion.The atom in a ligand that is directly attached to the metal cation or atom is called the donor atom and the number of donor atoms attached to metal cation or atom is called the coordination number. For example, coordination number of V in [V(H2O)6]2+ is 6, that of Cu2+ in [Cu(NH3)4]2+ is 4 and that of Co³ in [Co(NH3)6]3+ is 6.