Ionization energies of organic compounds by equilibrium measurements

1978 ◽  
Vol 100 (19) ◽  
pp. 6027-6034 ◽  
Author(s):  
Sharon G. Lias ◽  
P. Ausloos
Keyword(s):  
Organic Compounds ◽  
Ionization Energies

Transmission of Electronic Effects in Substituted Pyridine-N-Oxides Studied by ESCA

1976 ◽  
Vol 31 (7) ◽  
pp. 856-857 ◽  
Author(s):  
G. Distefano ◽  
G. Spunta ◽  
F. P. Colonna ◽  
S. Pignataro
Keyword(s):  
Organic Compounds ◽  
Aromatic Ring ◽  
Solid Phase ◽  
Substituent Effects ◽  
Electronic Effects ◽  
Ionization Energies ◽  
The Subject ◽  
Aromatic Systems ◽  
Reported Data ◽  
Steric Inhibition Of Resonance

Abstract Since the first electron spectroscopic (ESCA) studies dealing with substituents effects upon core ionization energies (I.E.) of organic compounds1, little has been published on the subject. This was probably because the reported data did not always seem very meaningful. The absolute I.E. values obtainable in the solid phase are not very certain and also, the "shake-up" phenomena and the consequent broadening of the bands, which affect the I.E. values2, were not always taken into account. None the less we think that ESCA is a valuable tool for the study of substituent effects, and in particular of the transmission of electronic effects in aromatic systems. Previous work in this area has been published 2,3 , and more specifically an example of steric inhibition of resonance observed by means of ESCA I.E.'s and shake up data was recently reported4. Here we would like to report a further case in which the transmission of electronic effects through an aromatic ring is observed using ESCA.

The Tempo and mode(S) of Prebiotic Evolution

1997 ◽  
Vol 161 ◽  
pp. 419-429 ◽  
Author(s):  
Antonio Lazcano
Keyword(s):  
Origin Of Life ◽  
Organic Compounds ◽  
Biological Evolution ◽  
Current Evidence ◽  
Early Diversification ◽  
Time Period ◽  
The Galaxy ◽  
History Of ◽  
Widespread Phenomenon ◽  
The Origin Of Life

AbstractDifferent current ideas on the origin of life are critically examined. Comparison of the now fashionable FeS/H2S pyrite-based autotrophic theory of the origin of life with the heterotrophic viewpoint suggest that the later is still the most fertile explanation for the emergence of life. However, the theory of chemical evolution and heterotrophic origins of life requires major updating, which should include the abandonment of the idea that the appearance of life was a slow process involving billions of years. Stability of organic compounds and the genetics of bacteria suggest that the origin and early diversification of life took place in a time period of the order of 10 million years. Current evidence suggest that the abiotic synthesis of organic compounds may be a widespread phenomenon in the Galaxy and may have a deterministic nature. However, the history of the biosphere does not exhibits any obvious trend towards greater complexity or «higher» forms of life. Therefore, the role of contingency in biological evolution should not be understimated in the discussions of the possibilities of life in the Universe.

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