Terms used in Complex Salt-Central Metal Ion/Ligand/C.N./Denticity/Coordination Sphere/Ionisation Sphere || Coordination Polyhedra || Charge on Ion || ON OF CMA || Classification OF Complex Salt- Basis OF Charge || Types OF Ligand || Bonding Pattern || Stability

Bonding in Zeises Salt (v.v.imp) || Trans Effect || Charge in bond order OF Organic Ligands || Oxidation Number OF CMI in Complex || Charge on Complex

Terminologies used in Coordination Compounds||Ionisation Sphere||Coordination Sphere||Central Metal Atom||Ligand|| Complex Ion||Charge on Complex Ion||Coordination Number||Oxidation Number|| Coordination Polyhedra||Types OF Complex Salt

Example OF Perfect and Imperfect Complex || Formation and Dissociation Constant OF Complex || Mononuclear and Polynuclear Complex || Classification OF Ligands-On the basis OF Charge/On the basis OF Denticity-monodonor and Polydonor Ligand

Types OF Complex Salts||On the basis OF number OF CMA in Coordination Sphere ||Mononuclear & Polynuclear|| On the basis OF Stability ||Perfect and Imperfect Complex||Types OF Ligand||On the basis OF Charge ||Anionic|| Neural||Cationic

The total number of Ligands attached to the central metal ion through coordinate bond is called–

Introduction,Addition and Molecular Compounds||Double Salts and Complex Compounds||Terms used in Coordination Compounds||Ligands and Their Classification on the basis OF Denticity

Introduction OF Complex Compounds and Double Salts, Central Metal Atom, Ligands and Their Classification

Valence bond theory for bonding in transition metal complexes was developed by Pauling. From the valence bond point of view, formation of a complex involves reaction between Lewis bases (ligands) and a Lewis acid (metal atom or metal ion) with the formation of coordination covalent (or dative) bonds between them. The model utilizes hybridization of metal s, p and d valence orbitals to account for the observed structures and magnetic properies of complexes. Valence bond theory is able to deal satisfactorily with many stereo chemical and magnetic properies but is has nothing to say about electronic spectra or the reason for the kinetic inertness of chromium (III) and low spin cobalt (III) octahedral complexes. To understand this and more other features of transition metal we must turn to other theories like crystal field theory etc. Pure crystal field theory assumes that the only interaction between the metal ion and the ligands is an electrostatic or ionic one with the ligands being regarded as negative point charges. This theory is quite successful in interpreting many important properties of complexes. The hybridization of [NiCl_(2)(PPh_(3))_(2)]" and "[NiCl_(2).(Pme_(3))_(2)] are respectively (consider PPh_(3) a bulkier ligand than Pme_(3) ) :