A Theory of Color Production II, Inorganic Compounds by Julius Stieglitz

By Julius Stieglitz

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By Julius Stieglitz

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20. The data first show that the half-time largely varies within our set of biological materials. In general it is shorter in particles with a larger antenna, in agreement with the initial hypothesis. However the half-time remains long (15–25ns) in PS-II preparations with a rather large antenna (about 60 chlorophylls); it seems to decrease sharply in the “membranes”, which are the most intact preparations. So we cannot really decide whether the important parameter is the antenna size or the intactness of the structure.

These cyanide complexes, however, are extremely sensitive to the environment. In principle, analogous complexes with the stong-field isocyanide ligands could have long-lived excited states and be immune towards environmental effects. Thus, the methyl isocyanide complexes Ru(bpy)2(CN)(CNMe) +, Ru(bpy) (CNMe) 2+, Ru(bpy)(CNMe) 2+ have been synthetized and studied. 2 2 4 The complexes have been prepared by methylation of the corresponding cyanide complexes, followed by appropriate chromatographic separation procedures.

5 Å. Upon photoexcitation fast intramolecular charge-separation is observed similar in rate and in temperature dependence to the early steps of photosynthesis. It is proposed that the bridges play an active role in mediating electron transfer via through-bond interaction, thereby enhancing the rate of charge separation significantly as compared to other model systems. The consequences of these findings for the mechanisms underlying the very fast charge separation processes occurring in the early stages of photosynthesis are discussed.

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