Electron affinity, organic compounds

In general, oxygen reacts rapidly with anion radicals of electron-affinic organic compounds (Table V). The anion spectra produced either directly by reaction of the solute with solvated electrons or by electron transfer, decay first order in oxygen when present. 

Because of it has great affinity for oxygen, the metal is used as a "getter" in electron tubes. It is also used in photoelectric cells, as well as a catalyst in the hydrogenation of certain organic compounds. 

Since the values of for many organic acceptors are generally unobtainable (in organic solvents), an alternative measure of the electron-acceptor property is often based on the irreversible cathodic peak potential F (in cyclic voltammetry). Thus for a series of related compounds, Fig. 6 shows that the values of Fred are linearly related to gas-phase electron affinities (EA).70... 

HF M. S. Banna and D. A. Shirley. J. Chem. Phys. 63 1975, 4759 H20 K. Kimura, S. Katsumata, Y. Achiba, T. Yamazaki, and S. Iwata, HandbookofHelPhotoelectron Spectra of Fundamental Organic Compounds, Japan Scientific Society Press, Tokyo, 1981 All electron affinities R.G. Pearson. Inorg. Chem. 27 1988, 734, except for F2 and Cl2 which are taken from J. A. Ayala, W. E. Wentworth and E. C. M. Chen, J. Phys. Chem 85,768,1981. 

Thomas Lowry, "Introductory Address to Part II Applications in Organic Chemistry of the Electronic Theory of Valency," 485487, Trans.Far.Soc. 19 (1923) 487. "Intramolecular Ionisation in Organic Compounds," ibid., 487496 and "The Transmission of Chemical Affinity by Single Bonds," ibid., 497502. 

The greatest research effort on radiation sensitizers has focused on organic compounds however, platinum complexes conform to the hypotheses for radiation sensitizers since they are electron affinic and react preferentially with the hydrated electron in aqueous solution. Early studies of cisplatin in combination with radiation therapy suggested a synergistic effect in antitumor activity (50,51). Much of the initial data were obtained using cells in tissue culture (52), these data indicated that the potential of cisplatin to inhibit repair of radiation-induced damage to DNA could be an important contributor to the enhanced tumor cell killing seen in vivo by the combination of these two modes of treatment. 

Relation between the LUMO and the half-wave potential of the first reduction wave When an organic compound, Q, is reduced, it accepts an electron from the electrode to its lowest unoccupied molecular orbital (LUMO). Here, the energy of the LUMO of Q corresponds to its electron affinity (EA). If the energies of LUMO ( lu) for a series of analogous compounds are obtained by the molecular orbital method, there should be a relationship ... 

Ions of both polarities are generated, usually at comparable abundances. For atomic ions, their yield is governed in first order by the ionization potential or electron affinity. For acidic compounds, specific molecular ions (e.g. (M-H) ) are found mostly in the negative ion spectra for basic compounds specific ions (e.g. (M+H), (M+Alkali) ) are more easily identified in the positive ion spectra. The somewhat surprising results obtained for organic salts will be discussed further down. 

Selective for compounds with high electron affinity, such as chlorinated organics concentration detector... 

It might be of interest to investigate the reactivity of additional functional groups by examining organic cyanates, thiocyanates, selen-ides, tellurides, phosphines, arsenides and others. All these compounds, which are expected to be reactive towards e q, await investigation that may help to evaluate their electron affinities. 

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