Organized molecular systems

The Langmuir-Blodgett deposition is one of the best methods to prepare highly organized molecular systems, in which various molecular parameters such as distance, orientation, extent of chromophore interaction, or redox potential can be controlled in each monolayer. We have been studying... 

W. Rettig, R. Fritz, and J. Springer, Fluorescence probes based on adiabatic photochemical reactions, in Photochemical Processes in Organized Molecular Systems (K. Honda, ed.), p. 61, Elsevier Science Publishers, Amsterdam (1991). 

K. Honda, Ed., Photochemical Processes in Organized Molecular Systems, North-Holland, Amsterdam, 1991. 

This last problem is perhaps not strictly within the realm of photochemistry. It is however so important potentially that it cannot be overlooked on grounds of arbitrary separations between different branches of scientific research (perhaps the expression of interdisciplinary approach would best describe it). A few pages will therefore be devoted to the science and technology of artificially organized molecular systems such as monomolecular and multimolecular layers, micelles and spatially restricted environments like zeolites and since we reach here another of the frontiers of photochemistry, section 8.4 in the final chapter is devoted to these systems. 

The LB deposition is one of the best methods to prepare highly organized molecular systems, in which various molecular parameters such as distance, orientation, extent of chromophore interaction, or redox potential can be controlled in each monolayer. We have been studying photophysical and photochemical properties of LB films in order to construct molecular electronic and photonic devices. The molecular orientation and interactions of redox chromophores are very important in controlling photoresponses at the molecular level. Absorption and fluorescence spectra give important information on them. We have studied photoresponses, specific interactions, and in-plane and out-of-plane orientation of various chromophores in LB films [3-11], In addition to the change of absorp-... 

Shilov devoted his review [12] to the development of selective and non-waste processes. He discusses the questions of organized molecular system (or ensembles) construction. Note that in the case of usual catalysis, catalytic sites freely interact with substrate molecules. This process is characterized by the absence of complementary activity. This is the reason for the relatively low selectivity of catalytic reactions. However, from positions of applied catalysis, such a catalytic system possesses clear advantages ... 

In this paper we discuss results obtained in constructing the organized molecular systems for PET based on the use of ultrathin lipid or surfactant membranes, and in studying the mechanisms of PET in such systems. The state of the art in conjugation of PET across membranes with catalytic reactions of water reduction to dihydrogen and its oxidation to dioxygen will be also briefly discussed. 

Kokorin, Alexander I, was bom in 1947. Was graduated as a biophysicist in 1970 Ph.D. (Candidate of Sciences) in 1974 D.Sc. degree (Doctor of Sciences) in physical chemistry - in 1992. At present Principal Researcher and Deputy Head of the Division of Kinetics and Catalysis, N. Semenov Institute of Chemical Physics of Russian Academy of Sciences, Moscow, Russia. Area of research interests chemical methods of solar energy conversion chemical physics of organized molecular systems, including nanosized oxide semiconductors doped with transition metal ions, and polymer-metal complexes the study of their structure, absorptive, catalytic, photocatalytic and photoelectrochemical properties. EPR spectroscopy and spin-spin interaction between paramagnetics. He is the author and co-author of more than 170 publications, including two books and several reviews and book chapters. 

Sarda S, Heughebaert M, Lebugle A (1999) Influence of the type of surfactant on the formation of calcium phosphate in organized molecular systems. Chem Mater 11(10) 2722-2727... 

Rettig W, Fritz R, Springer J (1991) In Honda K (ed) Photochemical processes in organized molecular systems. Elsevier, Amsterdam, p 61... 

T. Tsutsui, C. Adachi, S. Saito, Electroluminescence in Organic Thin Films, in Photochemical Progress in Organized Molecular Systems (Ed. K. Honda) Elsevier Science Publishers, B. V., Amsterdam 1991, 437-450. 

During the past decade, an increasing interest in multiphoton absorption of organic molecular systems has been observed. There were many attempts to establish the so-called structure-property relationships for organic systems using computational techniques [3, 10, 46, 51, 58, 66, 87, 95, 118, 119, 125, 126, 127]. 

The preparation of materials in the solid state is rather different from the synthesis of discrete molecules. The properties of inorganic and organic molecular systems can be altered by reaction in solution, to add or remove particular groups, and the products can be purified by recrystallization. The synthesis and alteration of solids is very different. It involves treatment of the whole lattice. Often, post-synthesis purification of the materials is not possible owing to the low solubility of the phases formed. Hence, every effort must be made to avoid excesses of reagents. 

We note that the reorganization energy is directly related to such quantities as the polaron binding energy = Xj2) and the dimensionless electron-phonon parameter (K-ph = N(Ep), where N(Ep) is the density of states at the Fermi level [15,23-25,43], The electron-phonon parameter is a key value in the conventional theory of superconductivity. Therefore, the results discussed before are especially relevant in the development of adequate polaron models to understand superconductivity and charge transport in organic molecular systems. 

Gould, I. R. Young, R. H. Farid, S. In Photochemical Processes in Organized Molecular Systems Tazuke, S. Honda, K., Eds. North-HoUand Amsterdam, Netherlands, 1991 pp 19-40. 

---