Figure 2.

Experimental X-band transient EPR spectra of linear porphyrin chains (P1–P6) in MeTHF:pyridine 10:1 recorded at 20 K as average up to 2 μs after the laser pulse with unpolarized light at 532 nm. Simulations with the parameters reported in Table 1 are compared to the experimental data. The ordering of the triplet sublevels was chosen as |Z| > |X| > |Y|, and the six canonical positions are indicated for P1 and P2. For P3–P6, the same assignments as shown for P2 are valid (A = absorption, E = emission). The inset shows the orientation of the ZFS tensor in the molecular frame for the oligomers P2–P6.