Coordination compounds compounds composed of a metal atom or ion and one or more ligands. Ligands usually donate electrons to the metal Includes organometallic compounds New theories arose to describe bonding. -Valence bond,crystal field,and ligand field Co H.c ethylenediaminetetraacetate(EDTA4-) (hexadentate) CoEDTACoordination compounds Coordination compounds compounds composed of a metal atom or ion and one or more ligands. – Ligands usually donate electrons to the metal – Includes organometallic compounds New theories arose to describe bonding. –Valence bond, crystal field, and ligand field. N CH2 CH2 N CH2 C O O CH2 C O O C H2C O O C H2C O O ethylenediaminetetraacetate (EDTA4–) (hexadentate)