Chapter 6 The polyatomic molecules
Chapter 6 The polyatomic molecules
Chapter 6 The polyatomic molecules
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II. Crystal-Field <strong>The</strong>oryB. Magnetic propertiese.g., Fe(NH 3 ) 62+(Fe 2+ = d 6 )ore gt 2ge gt 2glow-spin complex(maximum pairing)diamagnetichigh-spin complex(minimum pairing)paramagneticfoundexperimentallyII. Crystal-Field <strong>The</strong>oryB. Magnetic propertiesCompetition between: crystal field splitting (Δ)electron pairing energy (P)when Δ < P ⇒ high-spin complexwhen Δ > P ⇒ low-spin complexGenerally: d 1 , d 2 , d 3 : always high-spind 4 , d 6 : high-spin with ligands ≤ H 2 Olow-spin with ligands > H 2 Od 5 : high-spin with all ligands except CN –d 7 -d 10always low-spin
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