Question

What is spin pairing energy (SPE)? How is it related to crystal field splitting energy? Relate the splitting energy for octahedral and tetrahedral complexes and briefly explain why tetrahedral complexes are almost always high spin

Answer 1

solution: required to I place two Spin pairing energy: It is the energy electron in the same orbit at. Relation between spin pair energy and crystal field splitting If the crystal field splitting is small because of weak bonding Tigand, then the spin pairing energy will be largers and the If the crystal field spliting (A) is large because of strong bonding ligands, then the spin & pairing energy will be smaller. ctahedral complexes: Six ligand attached to six the central transition metcal. The d orbital splits into two different levels. The bottom three energy levels are dxe, dxz and dyz. The two upper energy levels are dx2-y and d 2 = Tetrahedral complex - our ligands attached to the central transition metal. The d orbital splits into two different teo energy levels. Upper three energy levels to are dxy, dxz, dyz. Bottom two energy levels are dx2-y2 de 2.0

dx2-y dz2 e day dxz dyz to 7/10 - - ! n dxz dyż tag dyz d 2 dx2-y2 Tetrahedral Octahedral Tetrahedral complex are almost always high spin because the splitting parameter, At, is significantly smaller than the corresponding octahedron parameter to. In crystal field they theory, there is a complicated derivation which leads to the conclusion that At = 4 to Since the splitting At is smaller, it is usually easier to promote an electron to the higher energy to orbitals rather than to pair the electrons up in the lower - energy e orbitals. Because of this geson most tetrahedral complexes are high spin