3/24/2024 0 Comments Sp3d hybridization shapeThe most common coordination polyhedra are octahedral, square planar and tetrahedral. Coordination number of a metal ion is also equal to the total number of coordinate bonds present in a complex.Ĭoordinations polyhedron: The spatial arrangement of the ligand atoms which are directly attached to the central atom/ion defines a coordination polyhedron about the central atom. Irrespective of their nature all types of ligands have lone pair of electrons.Ĭoordination number: Total number of ligand atoms which are bound to a given metal ion is called its coordination number. The ligands may be anions like CN –, C –, C 2O 4 2– ion neutral molecules like H 2O, NH 3, CO. Ligand: The groups attached to the central metal ion (or atom) in a complex are called ligands. It may be neutral or charged.Įxamples: 3+, 2–, 3–, Coordination entity : A coordination entity constitutes a central atom/ion, usually of a metal, to which are attached a fixed number of other atoms or groups each of which is called a ligand.
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