Photoinduced energy and electron transfers in the porphyrin triad (zinc octaethylporphyrin-4,4′ bipyridinium-tetraphenylporphyrin)2+, 2C1O4−)

Self-oriented polycationic copolymers obtained from bipyridinium meso-substituted-octaethylporphyrins

“…Similar spectral effects in dimeric or trimeric porphyrins have been reported and analyzed [36][37][38][39][40][41][42] as dependent on the interporphyrins angles, the direction of the transition dipole moments in the monomer subunits, and also distances between the porphyrins [43][44][45][46]. Table 1.…”

Electrochemical behavior of the tetracationic porphyrins and

“…Porphyrins substituted at the b or meso position with a single positively charged substituent such as a pyridinium, bipyridinium or phosphonium group did indeed undergo reduction of the substituent at potentials close to those of the porphyrin p system [16][17][18][19][40][41][42][43][44]. In this case, the redox pattern of the substituted groups could be strongly modified by the influence of the porphyrin moiety [37][38][39].…”

A simple way for the electropolymerization of porphyrins

“…The shape of all of the different UV-vis spectra revealed identical characteristics, and consisted in a large absorption band whose maximum was red shifted compared to the monomer. This evolution could be interpreted by the exciton-coupling theory involving intra-and inter-molecular excitonic interactions between the porphyrins subunits [26][27][28][29][30][31][32][33]. The red-shift of the soret (B) band compared to the corresponding unsubstituted porphyrins resulted from the electron-withdrawing effects [34,35] of the meso-substituent bipyridinium and/or viologen on the porphyrin.…”