By Felix Gutmann, C. Johnson, Hendrik Keyzer, J. Molnar
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Extra info for Charge transfer complexes in biological systems
The majority of workers use DH, the enthalpy of dissociation, as the index for complex stability which can be derived from the variation of Kc with temperature T: Page 19 The standard free energy DFd is also used: where DSd is the entropy change. The entropy change is a particularly useful parameter for determining conformational and solvent interaction changes in large molecules such as proteins. The enthalpy of dissociation is an index of the energy required to break the bond between components of the complex.
Yet there appears to be a marked indifference to the qualitative and quantitative features of noncovalent interactions which are the primary directors of specificity, rate control and reversibility in biochemical reactions. Critical assessment of the role of these particular biological phenomena is overdue. Furthermore, when the effects of a drug on metabolism are traced, one should give due consideration to noncovalent molecular interactions. Drugs, therapeutic or otherwise, may cause gross alterations of biological functions.
1 eV, say, is gained whether the accelerating field is 1 V/m or 1 V/mm. 0104 eV. , a dative regimen. Slifkin [ 4] distinguishes a class of medium-strength complexes in which the ground state is dative to a certain degree, though not to the extent encountered in the strong complexes. Here, complexes will be considered either as weak or as strong adducts. Complexes may involve ternary, surface, transient and self-complexes. CTC formation is favored if the donor has a low ionization potential and the acceptor a high electron affinity.
Charge transfer complexes in biological systems by Felix Gutmann, C. Johnson, Hendrik Keyzer, J. Molnar