Showing papers on "Artificial photosynthesis published in 1995"
TL;DR: In this article, the authors focus on the photodriven conversion of liquid water to gaseous hydrogen and oxygen, a process similar to that of biological photosynthesis, using sunlight to drive a thermodynamically uphill reaction of an abundant material to produce fuel.
Abstract: The maintenance of life on earth, our food, oxygen, and fossil fuels depend upon the conversion of solar energy into chemical energy by biological photosynthesis carried out by green plants and photosynthetic bacteria. In this process sunlight and available abundant raw materials (water, carbon dioxide) are converted to oxygen and the reduced organic species that serve as food and fuel. A long-standing challenge has been the development of a practical artificial photosynthetic system that can roughly mimic the biological one, not by duplicating the self-organization and reproduction of the biological system nor the aesthetic beauty of trees and plants, but rather by being able to use sunlight to drive a thermodynamically uphill reaction of an abundant materials to produce a fuel. In this Account we focus on “water splitting”, the photodriven conversion of liquid water to gaseous hydrogen and oxygen:
2,377 citations
TL;DR: This chapter focuses on multielectron reactions in organized assemblies of molecules at the liquid/liquid interface, and describes the thermodynamic and kinetic parameters of such reactions, including the structure of the reaction centers, charge movement along the electron transfer pathways, and the role of electric double layers in artificial photosynthesis.
42 citations
TL;DR: In this paper, a new artificial photosynthesis porphyrin tetrad compound was synthesized and compared with two triad compounds and two diad compounds (3a, 3b) for photoelectric conversion.
11 citations
11 citations
TL;DR: In this article, the electron transfer rates between sensitizers and acceptors for a novel class of bis(4,4′-dimethyl-2,2′-bipyridine) and cyclo-[bis(1,1′-p-xylylene-4, 4′-bypiridinium (MV2+)] (BXV4+) complexes were derived from the viologen radical and hydrogen production rates in sacrificial model systems for artificial photosynthesis.
Abstract: Modell Systems for an Artificial Photosynthesis – Synthesis and Electron Transfer Studies of Novel Sensitizer-Relais Assemblies
Syntheses and determination of electron transfer rates between sensitizers and electron acceptors for a novel class of bis(4,4′-dimethyl-2,2′-bipyridine)[4,4′-bis(alkoxymethyl)-2,2′-bipyridin]ruthenium(II) complexes 6–8 are described. We report on the formation of supramolecular complexes between the dialkoxybenzene-tethered bisheteroleptic Ru(II)-bipyridine complexes 5, 8 and 1,1′-dimethyl-4,4′-bypiridinium (MV2+) and cyclo-[bis(1,1′-p-xylylene-4,4′-bipyridinium)] (BXV4+), respectively. Evidence for the formation of supramolecular sensitizer-relais assemblies is taken from the viologen radical and hydrogen production rates in sacrificial model systems for artificial photosynthesis.
10 citations
01 Jan 1995
TL;DR: In this paper, the authors have established new and active water oxidation catalysts as models for the photosynthesis especially by using heterogeneous polymer systems and showed that the protein part of the oxygen evolving center plays an important role for the catalysis.
Abstract: Photosynthesis is attracting attention as an important model of artificial photochemical conversion system in relevant to solar energy conversion for new energy resources. In the photosynthesis, dioxygen evolution is the most important process which provides electrons to the whole photochemical system. Several proposals have been put forward to elucidate the mechanism in the dioxygen formation from two water molecules and four molecules of one-electron oxidation catalyst. The protein part of the oxygen evolving center plays an important role for the catalysis. However, these mechanisms remain the most obscure part of plant photosynthesis. In order to construct artificial photosynthesis for the future energy source, it is important to utilize heterogeneous system such as polymer aggregates. The present authors have established new and active water oxidation catalysts as models for the photosynthesis especially by using heterogeneous polymer systems.
7 citations
TL;DR: A series of artificial photosynthesis porphyrin compounds consisting of electron donor and electron acceptor (compounds 1-6) were synthesized and their spectroscopic behaviors in solution were investigated and the synthetic molecular devices were prepared with these molecules by using LB technique as discussed by the authors.
Abstract: A series of artificial photosynthesis porphyrin compounds consisting of electron donor and electron acceptor (compounds 1-6) were synthesized. Their spectroscopic behaviors in solution were investigated and the synthetic molecular devices were prepared with these molecules by using LB technique. It was indicated that multistep electron transfer and charge separation for these compounds actually occur, which is of great advantage to their photoelectric conversion. An efficient energy transfer process takes place for compound 6. A mechanism involving photoinduced electron transfer and multistep charge separation for these compounds was suggested. With only one monolayer of tetrad 1 LB film on the surface of Sn02 conductive glass, high photo-driven voltage and current were obtained.
1 citations