Photochemical correlations between various

H and, 3C NMR spectra of monoimines have been reported and are shown in Table 3. These data fit the Hammett relationship and good correlations are found between various o constants and, 3C chemical shifts at positions remote from the substituent.1413C chemical shifts of imines derived from BA and variously substituted benzylamines are affected by substituents through up to 11 bonds.15 The influence of ZjE isomerism (Figure 3) and the effect of substituents on NMR spectra of some unsaturated imines have been studied.16 The photochemically induced isomerization of several substituted Schiff bases derived from BA and arylamines and their chemical shifts, as well... 

The materials analyzed were blends of polystyrene (PS) and poly(vinyl methyl ether) (PVME) in various ratios. The two components are miscible in all proportions at ambient temperature. The photooxidation mechanisms of the homo-polymers PS and PVME have been studied previously [4,7,8]. PVME has been shown to be much more sensitive to oxidation than PS and the rate of photooxidation of PVME was found to be approximately 10 times higher than that of PS. The photoproducts formed were identified by spectroscopy combined with chemical and physical treatments. The rate of oxidation of each component in the blend has been compared with the oxidation rate of the homopolymers studied separately. Because photooxidative aging induces modifications of the surface aspect of the material, the spectroscopic analysis of the photochemical behavior of the blend has been completed by an analysis of the surface of the samples by atomic force microscopy (AFM). A tentative correlation between the evolution of the roughness measured by AFM and the chemical changes occurring in the PVME-PS samples throughout irradiation is presented. 

Photophysical and flash photolysis experiments in various solvents showed that the resulting reactions of haloanilines proceed from the triplet state. The latter is involved in the photochemical processes resulting in C—X bond cleavages in which both homolytic and heterolytic pathways are rather competitive with each other152. There is also a certain correlation between the BDE(C—N) and activation energy for the C—N bond cleavage in the T state with the BDE(C—N) of the ground So state. 

We expect the effective-mode models described here to be versatile tools that can predict general trends, and that can be used in conjunction with microscopic information provided from other sources, i.e., spectral densities, energy gap correlation functions, and possibly cross-correlation functions. Further, model parametrizations could be provided by QM/MM type simulations, and the model-based dynamics could be employed to analyse the wealth of microscopic information provided by such simulations. Such complementary strategies would bridge the gap between system-bath theory approaches and explicit multi-dimensional simulations for ultrafast photochemical processes in various types of environments. 

The fluorescence properties of several europium and samarium ) -diketonates have been measured and assignments of the transitions made. Rare-earth element hexafluoroacetylacetonates with amino-acids have also been reported to fluoresce. The luminescence of the heptafluoroheptane-2,4-dione complexes of Sm, Eu, and Tb has been measured in dilute ethanol at pH8 and 610nm mixed-ligand complexes with 1,10-phenanthroline exhibited an enhanced luminescence. Photolysis of the Tb chelate of 2,2,6,6-tetramethylheptane-3,5-dione has been examined at 311 nm in various alcohols, and loss of one -diketone ligand found to be the primary photochemical step. A linear correlation was demonstrated between the quantum yield of dissociation of the complex and the formation constant of the complex-alcohol adduct. 

Austin et al (l) and Hieke (6) failed to detect significant differences in the rates of light dependent O2 evolution by isolated chloroplasts, between different ploidy levels. We, therefore, conducted an experiment to test whether or not there are differences in the photochemical activity of isolated chloroplasts among various species of wheat at different ploidy levels. We further attempted to correlate the photochemical activity with rates of flag leaf photosynthesis. 

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