COORDINATION COMPOUND - CRYSTAL FIELD THEORY in 30 Min. | BEST REVISION | NEET | JEE скачать в хорошем качестве

COORDINATION COMPOUND - CRYSTAL FIELD THEORY in 30 Min. | BEST REVISION | NEET | JEE

Crystal Field Theory (CFT) is a model in coordination chemistry that explains how the energy of metal ion d-orbitals changes when ligands approach and form a complex. It helps chemists understand properties like color, magnetism, and stability of coordination compounds. It was mainly developed by scientists such as Hans Bethe and John Hasbrouck Van Vleck. 1. Basic Idea In a free transition metal ion, the five d-orbitals have the same energy (they are degenerate). When ligands (molecules or ions donating electron pairs) approach the metal ion, their negative charge or electron cloud repels electrons in the metal’s d-orbitals. This repulsion causes the d-orbitals to split into groups with different energies. 2. Octahedral Crystal Field Splitting In an octahedral complex (six ligands around the metal), the d-orbitals split into two sets eg orbitals: (higher energy) t2g orbitals: (lower energy) The energy difference between these two groups is called crystal field splitting energy (Δ₀). Reason: Ligands approach along the x, y, and z axes. Orbitals pointing directly at ligands experience greater repulsion, so they have higher energy. 3. Tetrahedral Crystal Field Splitting In tetrahedral complexes (four ligands): t2 orbitals → higher energy e orbitals → lower energy The splitting energy here (Δt) is smaller than octahedral splitting because ligands do not approach directly along the axes. 4. High-Spin and Low-Spin Complexes Depending on the strength of ligands: Weak-field ligands (e.g., Cl⁻, H₂O) → small Δ → electrons occupy higher orbitals → high-spin complex Strong-field ligands (e.g., CN⁻, CO) → large Δ → electrons pair in lower orbitals → low-spin complex 5. Spectrochemical Series Ligands can be arranged according to their field strength: I⁻ Br⁻ Cl⁻ F⁻ H₂O NH₃ en NO₂⁻ CN⁻ CO Left → weak field Right → strong field 6. Applications of Crystal Field Theory Crystal Field Theory explains: Color of transition metal complexes (due to d–d electron transitions) Magnetic properties (number of unpaired electrons) Stability of complexes Geometry of coordination compounds #coordination_compounds #coordination #crystalfieldtheory #ligands #CFSE #vbt #inorganicchemistrycrashcourse #inorganicchemistry #inorganic_chemistry #neetchallenge #neetchemistrycrashcourse #neetchemistry #neetrevision #neetrevisionseries #conceptmumbra #conceptneetdigital #conceptneetacademy #mumbrathane #mumbrakausa #mumbra #jeerevision #jeechallenge #jeechemistry #jeemains2026 #jeechemistryquestions #neetbooster #jee2026 #jeebooster #neetsupport #neetoneshot #neetonlinevideos #nta #neet2026 #neet #neetpreparation #neetmotivation #oneshotrevision