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Questions and Answers
What is the formula for Crystal Field Splitting Energy (CFSE) in octahedral coordination?
CPSE = eg x 0.6 + bg x 0.4
What is the calculation for ΔT in an octahedral environment?
ΔT = 3 x 0.4 - 4 x 0.6 = -1.2
What is the CFSE for a tetrahedral coordination?
CFSE = eg x 0.6 + bg x 0.4 = 2.4
What electron configuration does Fe2+ have?
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In a tetrahedral coordination, eg equals 0 x 0.6 + 6 x 0.4.
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Match the following coordination types with their associated characteristics:
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What does the term 'Case A = 0' signify in crystal field splitting?
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What is the meaning of A > 0 in the context of crystal field splitting?
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Study Notes
Crystal Field Splitting Energy (CFSE)
- Crystal field splitting energy (CFSE) is calculated differently for octahedral and tetrahedral complexes.
Octahedral Complexes
- For octahedral coordination (6 total ligands), CFSE is given by the formula: eg x 0.6 + bg x 0.4.
- In terms of electron pairing: eg reflects the higher energy orbitals while bg reflects lower energy orbitals.
- Example calculation of CFSE yields: ΔT = 3 x 0.4 - 4 x 0.6 = -1.2.
Tetrahedral Complexes
- For tetrahedral coordination (4 total ligands), CFSE is also calculated with the same formula: eg x 0.6 + bg x 0.4.
- Calculation for a tetrahedral complex shows: eg = 0 x 0.6 + 6 x 0.4 = 2.4.
Diagrams
- Represents octahedral and tetrahedral geometries visually.
- "Co(H2O)4) 42 (tetrahedral)": propeller diagram.
- Tetrahedral complex shown as a flower with 4 petals.
- Octahedral complex depicted as a flower with 6 petals.
Element Configurations
- Iron (Fe) has electronic configuration of 4s3d6.
- Iron (Fe²⁺) retains the 4s3d6 configuration as a cation.
- Cobalt (Co) has electronic configuration of 4s3d7.
- Cobalt (Co²⁺) similarly has the 4s3d7 configuration as a cation.
Cases
- Case A=0: Indicates all electrons are unpaired with an overall configuration of 11 11 11 11, resulting in +0.6 for eg and -0.4 for bg; maintains the appearance of 11 11 11 11.
- Case A > 0: Reflects a differently unpaired arrangement of electrons, shown by the configuration 1 1 1 1 1 1 7 7, with the same energy contributions of +0.6 for eg and -0.4 for bg.
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Description
Test your understanding of crystal field splitting energy in octahedral and tetrahedral complexes. This quiz covers key concepts, formulas, and diagrams related to the Crystal Field Theory. Deepen your knowledge of coordination chemistry through practical calculations and visual representations.
