and [(C5 i Pr5)Dy(μ-I)3Dy(C5 i Pr5)] 14 (Figure ) shows that while 1-Dy has faster spin dynamics than any of these other complexes below 80 K, its magnetic relaxation rates don't switch from the slower Raman regime to the faster Orbach regime until 120 K, at which point its spin dynamics are up to one hundred times slower than the other complexes.