4.1: Coordination Chemistry I - Structure and Isomers 4.2: Coordination Chemistry II - Bonding 4.1: Coordination Chemistry I - Structure and Isomers 4.1.1: History 4.1.2: Nomenclature and Ligands 4.1.3: Isomerism 4.1.4: Coordination Numbers and Structures 4.2: Coordination Chemistry II - Bonding Three theories are used to explain bonding in coordination compounds: (1) Crystal Field Theory, (2) Ligand Field Theory, and (3) the Orbital Overlap Model. Each theory has limitations, and each is applied when convenient for describing various experimental observations of coordination compounds. 4.2.1: Evidence for Electronic Structures 4.2.1.1: Thermodynamic Data 4.2.1.2: Magnetic Susceptibility 4.2.1.3: Electronic Spectra 4.2.1.4: Coordination Number and Molecular Shapes 4.2.2: Bonding Theories 4.2.2.1: Crystal Field Theory 4.2.2.1.1: Crystal Field Theory 4.2.2.1.2: Colors of Coordination Complexes 4.2.2.1.3: Crystal Field Stabilization Energy 4.2.2.1.4: Factors That Affect the Magnitude of Δo 4.2.2.1.5: Jahn-Teller Distortions 4.2.2.1.6: Magnetic Moments of Transition Metals 4.2.2.1.7: Magnetism 4.2.2.1.8: Thermodynamics and Structural Consequences of d-Orbital Splitting 4.2.2.2: Ligand Field Theory 4.3: Ligand Exchange Reactions (Thermodynamics) 4.3.1: Associative Ligand Substitution 4.3.2: Dissociative Ligand Substitution 4.4: Electronic Spectra of Coordination Compounds