Bonding variations

Application of the functional approach to bond variations under pressure. V. Gutmann and H. Mayer, Struct. Bonding (Berlin), 1976, 31, 50-66 (58). 

Gutmann V, Mayer H (1976) Application of the Functional Approach to Bond Variations Under Pressure. 31 49-66... 

Compositional, Structural and Bonding Variations in Ternary Phases of Lithium with Main-group and Late-transition Elements... 

Although equation 11.146 agrees with the principle of electrostatic valence of Pauling (1929), normalization to the cation-to-oxygen distance R t-o lo account for bond variation... 

R. Ferreira Paradoxial Violations of Koop-man s Theorem with Special Reference to the 3 d Transition Elements and the Lanthanides. Cfionne/fe.-Band and Localized States in Metallic Thorium, Uranium, and Plutonium, and in some Compounds, Studied by X-Ray Spectroscopy V. Gutmann, H Mayer The Application of the Functional Approach to Bond Variations under Pressure... 

The situation becomes more complicated, however, when each oxygen belonging to an Fe coordination polyhedron is bound to different populations of next-nearest cations in their own coordination sites as a result of extensive atomic substitution of Fe2, Fe3, Ti4, etc., for Mg and Al. Such chemical and bonding variations for different mineral structures and the variability of inductive effects from adjacent cations are probably sufficiently strong to account for large ranges of isomer shifts exhibited within a specific coordination symmetry in silicate minerals. 

The silyl migration method involves intramolecular 1,3-silyl migration which is useful for introducing phosphorus multiple bonds. Variations of this 1,3-silyl migration have been classified as the condensation-silatropy method and the addition-silatropy method (Scheme 3)8. Becker reported a reaction involving rearrangement of silyl-substituted acylphosphine for the first time in 1976 (equation 3)9. 

With an electronegativity table, establishing the ionic or covalent nature of the bond between two atoms is just a matter of simple subtraction. However, there is more to understanding the chemical bond than just knowing the electronegativity of atoms. Several other bond variations will be covered in the next chapter. 

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