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Keywords:

  • phthalocyanine;
  • fullerene;
  • electrochemistry;
  • photoinduced electron transfer;
  • nonlinear optical properties

Abstract

A new amide-linked phthalocyanine-fullerene dyad ZnPc-C60 was synthesized and characterized. The photophysical and electrochemical properties of the ZnPc-C60 dyad were investigated. The fluorescence spectrum and quantum yield in different solvents showed the occurrence of photoinduced electron transfer (PET) from the singlet excited ZnPc to C60, which was further confirmed by nanosecond transient absorption spectra and cyclic voltammetry data. The free energy change for charge separation (ΔGCS) was estimated to be exothermic with −0.51 eV, which favored the formation of charge-separation state. The PET from ZnPc to C60 in ZnPc-C60 made the dyad exhibit stronger reverse saturable absorption performance compared with C60 and the control sample in the Z-scan experiments, which indicated the synergistic effect of two active moieties in the dyad.