Activation volumes for the quintet/singlet relaxation kinetics of iron(II) complexes

Mechanistic Information on the Reversible Binding of NO to Mono‐ and Dinuclear FeII Complexes of a Biomimetic S4N Ligand

“…[13][14][15] The volume of activation found for the binding of NO in the present study lies within this range of values and supports that Fe-NO bond formation can involve a contribution from the high-spin to lowspin transition. 17500 Ϯ 300 35 Ϯ 1 -47 Ϯ 5 -5 [b] 2620 Ϯ 160 12.5 Ϯ 0.7 -133 Ϯ 2 -6.7 Ϯ 0.3…”

“…[9a] Several studies have been reported on various iron(II) complexes that exist in high-spin/low-spin electronic state equilibria, [10,[13][14][15][16][17] and these have shown that the volume changes associated with such a spin transition of d 6 iron(II) fall in the range from -4 to -22 cm 3 mol -1 , depending on the solvent and ligand structure around the metal. [13][14][15] The volume of activation found for the binding of NO in the present study lies within this range of values and supports that Fe-NO bond formation can involve a contribution from the high-spin to lowspin transition.…”

Metal centered ligand field excited states: Their roles in the design and performance of transition metal based photochemical molecular devices

“…The large distortion of the quintet vs. the singlet is sufficient that applications of hydrostatic pressure markedly affect the equilibrium constants and rates of the spin-crossover process[116].…”

Time-Resolved Relaxation Studies of Spin Crossover Systems in Solution

“…One of the other practical advantages of the LFP technique for studying SCO kinetics is that the pulsed laser excitation source can be readily coupled to conventional static pressure vessels, enabling variable pressure studies and hence the derivation of activation volumes for the spin change [51,52]. …”