Several types of magnetic effects in molecules and their relation to molecular structure are discussed.Hyperfine structure in molecules with electronic angular momentum can give experimental determination of three independent parameters of the distribution of electronic angular momentum. These parameters are rather simply and directly related to the molecular electronic structure and hence afford critical tests for proposed structures. Fine structure for such molecules can also give useful information on electron distribution. 0 2 , NQ and OH are examples which will be discussed.
Akstract. In artificial photosynthesis the chief research goal is to duplicate the function of the photosynthetic unit in nature hut not its structural subunits. In this paper, light-induced electron-transfer processes of Ru-polypyridines as energy-storing systems, in the presence of suitable acceptors and catalysts, are described. New highly photostable photosensitizers are presented. A new approach using supramolecular (non-covalently) connected assemblies in addition to covalently linked systems for energy-storing processes is demonstrated. The use of classical and new Ru-complex assemblies in oxygen or hydrogen generation from water is dealt with. The efficiency of the new systems in the reduction of CO2 to methane is presented.
The new tris(6,6'-oligoethyleneglycol-3,3'-bipyridazine)Ru~~-dich~orides 1,2 form binuclear metal complexes with alkali and alkaline earth ions w i t h high selectivity and these complexes show increased fluorescence quantum yields and lifetimes.
Absorption spectra, emission spectra (90 and 298 K), luminescence lifetimes, luminescence quantum yields, and photochemical behavior of a semicage bipyridazine (bpdz) Ru(II) complex K6 and related open-chain bpdz model complexes Kl-4 have been studied and compared with those of Ru(bpy)32+ K5. The absorption bands in the visible spectra of Kl-4 and Ru-podate K6 are close in energy to the corresponding bands of Ru(bpy)32+, whereas the emission bands are slightly red shifted. The luminescence lifetimes of K1^4/K6 (1500-3400 ns) are longer than that of K5 (600 ns). The open-chain bpdz model complexes and especially K6 are highly photoinert ( < 10"5) relative to the photodissociation of Ru(bpy)32+ ( = 0.068). These excellent photophysical properties and stabilities of the complexes Kl-4 and the Ru-podate K6 allow their effective use as photosensitizers in electron-transfer processes.Artificial photosynthesis is an important research subject in recent years.* 1 11It is of basic interest since artificial photosynthetic systems mimic the functions of the natural process and are of practical value for solar energy conversion and storage.2 One essential part of such systems is the light-harvesting unit that induces the electron transfer upon excitation. Ru-poly(pyridines),3 metal-porphyrins,4•5 phthalocyanines,6•7 organic dyes,8 and semiconductors9-11 have been used for this purpose.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.