For 10 points, identify this term used to denote atoms or molecules which donate electrons to a central atom in a coordination complex.
When they are contiguous, they exhibit hapticity, and are denoted using the letter eta. Those which form multiple bonds with organic compounds such as EDTA are called chelates, while monodentate ones can only form one bond, usually with a metallic atom. Common examples include the thiocyanate ion and carbon monoxide. For 10 points, identify this term used to denote atoms or molecules which donate electrons to a central atom in a coordination complex.
When they are contiguous, they exhibit hapticity, and are denoted using the letter eta.
ligand