A species made up of a metal ion center bonded to a number of ligand species.

a molecular entity formed by loose association involving two or more component molecular entities (ionic or uncharged), or the corresponding chemical species. The bonding between the components is normally weaker than in a covalent bond.Complexation is the formation of this complex.

Assembly of molecules that are held together by noncovalent bonds. Protein complexes perform most cell functions.

an active molecule brought within the proximity of a carrier molecule so that they remain together under the conditions of the media in which they are contained.

a dissolved species consisting of two or more ions or molecules that can exist as independent species.

two or more molecules which are associated together by some type of interaction of electrons, other than a covalent bond. (see: covalent bond)

A central molecule surrounded by ligand molecules attached by electrostatic attractions. They have a structure, but the bonds are often weak enough that the ligands can be readily exchanged in solution.

A strong chemical bond also known as a Chelate.

A complex in chemistry usually is used to describe molecules or ensembles formed by the combination of ligands and metal ions. Originally, a complex implied a reversible association of molecules, atoms, or ions through weak chemical bonds. As applied to coordination chemistry, this meaning has evolved.