Short-Time Photodecay Dynamics of Meso-Tetra(p-hydroxyphenyl)porphine in the Condensed Phase Explored via Resonance Raman Spectroscopy and Density Functional Theory Calculation

Ultrafast Relaxation Dynamics of 5,10,15,20-meso-Tetrakis Pentafluorophenyl Porphyrin Studied by Fluorescence Up-Conversion and Transient Absorption Spectroscopy

“…As shown in Figure , the characteristic features of the ground-state electronic absorption spectrum of free base H 2 F 20 TPP exactly follows the features of the well-studied system free base tetraphenyl porphyrin (H 2 TPP), ,, which consists of a strong transition to the second excited state (S0 → S2) at about 411 nm (the Soret) band) with a shoulder band at 370 nm and weak transition to the first excited state (S0 → S1) called the Q-band spreading over a wide range of the visible region with four distinct peaks at 505, 535, 580, and 635 nm, respectively. Although the origin and nature of the Soret band are not fully established, the assignment of this ascribed spectra is broadly in accordance with Gouterman’s well-described “four orbital” model. − Hence, the 411 nm band is assigned as the x -polarized B x band, and 370 nm is the y -polarized B y band. Similarly, the 505 and 535 nm bands are assigned as the y -polarized Q y (1,0) and Q y (0,0) vibartional modes, and the 580 and 635 nm bands are x -polarized Q x (1,0) and Q x (0,0) modes, respectively.…”