Summary of the global analysis of the TA data. The τ₁ to τ₄ are fitted exponential decay components of which τ₄ is a non-decaying (nd) component within the timeframe of the experiment. Relative amplitude of the non-decaying component in parenthesis, established by tracking a kinetic in the ground state bleach region of the spectrum.

System	Complex	τ 1 (ps)	τ 2 (ps)	τ 3 (ps)	τ 4 (ps)
In Buffera	[Fe(cpbmi)2](PF6)2	7	20
	[Fe(cpbmi)(dtapbmi)](PF6)2	2	18
	[Fe(cpbmi)(daapbmi)](PF6)2	2	18
In MeCN	[Fe(dtapbmi)2](PF6)2	3	11
	[Fe(daapbmi)2](PF6)2	6	17
On Al2O3	[Fe(cpbmi)(dtapbmi)](PF6)2	17
	[Fe(cpbmi)(daapbmi)](PF6)2	18
On TiO2	[Fe(cpbmi)(dtapbmi)](PF6)2	0.1	18	150b	ndc (5%)
	[Fe(cpbmi)(daapbmi)](PF6)2	0.1	3b	22	ndc (10%)

^aConsisting of 0.1 M TBA methanesulfonate and 0.1 M methanesulfonic acid in acetonitrile.

^bThese minor additional components appears to differ significantly for the two complexes, which should not be overinterpreted for the primitive fit not assuming any model.

^cFitted by a time-component with infinite lifetime.