A More Quantitative Approach to Estimating Δoct

Trends dependent on the metal ion (page 642 H&S 3rd edition)

A More Quantitative Approach to Estimating Δoct

Using Jorgensen’s f and g factors

Δoct = f x g (if all ligands are the same)

Δoct = [(f1+f2+f3+f4+f5+f6)/6] x g(if ligands are different, take weighted average for f)

•f depends on the ligands, found in tables•g depends on the metal ion, found in tables, units of 1000cm-1

A More Quantitative Approach to Estimating Δoct

Using Jorgensen’s f and g factors

A More Quantitative Approach to Estimating Δoct

Using Jorgensen’s f and g factors

Sample Problem: Calculate Δoct for Rh(pyr)3Cl3

Low spin vs. high spin does not depend on just Δoct,Also depends on the electron pairing energy, P

Low spin vs. high spin does not depend on just Δoct,Also depends on the electron pairing energy, P

Using P (e- pairing energy) to Predict Low spin vs. High Spin

For high spin: Δoct < PFor low spin: Δoct > P

Metal ion P/gRh3+ d6 0.4Co3+ d6 0.7Fe2+ d6 0.9Fe3+ d5 1.1Mn2+ d5 1.5Co2+ d7 2.3

Using P (e- pairing energy) to Predict Low spin vs. High Spin

Magnetic Properties of Transition Metal Complexes

•Read pages 670-678 of H&S 3rd edition

HOW IS THE MAGNETIC MOMENT (μ) MEASURED?