Photoinduced Electron Transfer from Phthalocyanines to Fullerenes (C₆₀ and C₇₀)

Abstract

Photoinduced electron transfer between fullerenes (C60 and C70) and phthalocyanines such as tetra-tert-butylphthalocyanine (H2TBPc) and its zinc derivative (ZnTBPc) in solution has been investigated with nanosecond laser photolysis method by observing the transient absorption bands in the visible/near-IR regions. By the predominant excitation of fullerenes with 532 nm laser light, slow rises of the transient absorption bands of phthalocyanine cation radicals and fullerene anion radicals were observed instead of the decays of the excited triplet states of fullerenes (TC60* and TC70*) in polar solvents. Electron-transfer from the phthalocyanines to TC60* or TC70* was confirmed. The quantum yield of the electron transfer via TC70* is higher than that via TC60*; ZnTBPc acts as stronger electron donor than H2TBPc. In nonpolar solvent, energy transfer from TC60* (and TC70*) to the phthalocyanines occurs predominantly as confirmed by the consecutive appearance of the triplet states of the phthalocyanines.

Formation and photoinduced properties of zinc porphyrin-SWCNT and zinc phthalocyanine-SWCNT nanohybrids using diameter sorted nanotubes assembled via metal-ligand coordination and π–π stacking

“…These assignments afford an evidence for ZnP •+ ←Im-Pyr/SWCNT(7,6) •-. Similarly, ZnPc←Im-Pyr/SWCNT(n,m) nanohybrids showed the nanosecond transient absorption bands appearing in the 800-1000 nm region (Figs 6c and 6d), in which 880-980 nm band can be ascribed to ZnPc •+ [23]; the broadening and red shift are due to the coordination and proximity to SWCNT. The absorption bands of the SWCNT(6,5) •-appeared at 1250 and 1350 nm ( Fig.…”

Photoinduced Electron Transfer in Zinc Phthalocyanine Loaded on Single‐Walled Carbon Nanohorns in Aqueous Solution

“…Upon 355-nm laser light excitation of ZnPc-SWNH ox -BSA in Ar-saturated solution, transient absorption bands appeared in the vis-NIR regions with peaks at 800, 980, 1120, and 1300 nm, as shown in Figure 3a. Usually, although the radical cation of ZnPc (ZnPc .þ ) shows an absorption peak at 860 nm, [12] the observed main band at 980 nm can be attributed to ZnPc .þ bound to SWNH ox , since the considerable red shift of $1400 cm À1 is reasonable taking the strong interaction of ZnPc .þ with the SWNH ox into consideration. The absorption bands in the NIR region can be considered as due to a trapped electron on the SWNH ox (SWNH ox .À ).…”

Molecular orbital analysis of frontier orbitals for molecular electronics: a case study of unimolecular rectifier and photovoltaic cell

“…6 presents the chemical structure naphthalocyanine as a donor used in this study. These supramolecules have been reported in previous studies [37,38]. Many unimolecular polymer -fullerene supramolecules have been synthesized for photovoltaic property [39].…”