Synthetic molecular systems based on porphyrins as models for the study of energy transfer in photosynthesis

Abstract

The published data on the synthesis and photochemical The published data on the synthesis and photochemical properties of porphyrin-based molecular ensembles which repre-properties of porphyrin-based molecular ensembles which represent models of natural photosynthetic light-harvesting complexes sent models of natural photosynthetic light-harvesting complexes are generalised and systematised. The dependence of the transfer are generalised and systematised. The dependence of the transfer of excitation energy on the distance between donor and acceptor of excitation energy on the distance between donor and acceptor components, their mutual arrangement, electronic and environ-components, their mutual arrangement, electronic and environmental factors are discussed. Two mechanisms of energy transfer mental factors are discussed. Two mechanisms of energy transfer reactions, reactions, viz viz., `through space' and `through bond', are consid-., `through space' and `through bond', are considered. The bibliography includes 96 references ered. The bibliography includes 96 references. .

Prospects for development of phthalocyanine-containing polymeric materials

“…Attaching the phthalocyanines in a polymer support offers many advantages which do not exist when unattached phthalocyanines are used. They include cooperative reactions in polymer chains, separation of active sites, the possibility of specific binding of different substrates on active sites, increasing the stability of the tetrapyrrole component, and the decrease in its toxicity with respect to biological media [10,12]. New materials made from polymerbound phthalocyanines and their complexes exhibit very unusual properties, in particular, due to inclusion of the metal in the polymer macromolecule, which opens up new possibilities for using them.…”

“…The elevated stability of phthalocyanines and the possibility of their purposeful synthesis from different compounds with previously assigned properties allows using them as convenient polymer modifiers. Modification can be conducted both in bulk and on the surface, by grafting, to impart the specific properties characteristic of this class of compounds.The evolution of polymer composite technology is opening up prospects for creating materials made from synthetic phthalocyanines supported on a polymer matrix by a method in which such compounds would exhibit the highest activity [9][10][11]. Attaching the phthalocyanines in a polymer support offers many advantages which do not exist when unattached phthalocyanines are used.…”

“…The evolution of polymer composite technology is opening up prospects for creating materials made from synthetic phthalocyanines supported on a polymer matrix by a method in which such compounds would exhibit the highest activity [9][10][11]. Attaching the phthalocyanines in a polymer support offers many advantages which do not exist when unattached phthalocyanines are used.…”

Synthesis of Covalently Linked Porphyrin Heterodimers with Potential Use in the Solar Energy Conversion Devices

“…nature of spacers, distance and orientation of donor with respect to acceptor) have been synthesized and their photophysical properties have been described in literature. [3,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] Irradiation of a donor pigment within a porphyrin dimer is followed by an effective energy transfer and, in some cases, a direct transformation of sunlight energy to the charge-separated state by means of electron transfer.…”

“…[1][2][3][4][5][6][7][8][9] Porphyrin-based assemblies have important applications in the development of artificial devices for solar energy conversion into chemical potential or electrical energy in common with that effected by natural photosynthetic systems. [7,[10][11][12][13][14] Studies performed with many donor-acceptor model systems [1][2][3][4][5][15][16][17][18][19][20] revealed the effects of structural factors, such as distance and orientation, as well as electronic nature of the spacer, driving force, temperature and solvent on the rates and quantum yields of the energy transfer and charge separation processes. Porphyrin dimers are good photosynthetic models in which the geometry, distance and angle between the porphyrin moieties strongly influence on the efficiency of the photophysical processes.…”