The quantum-mechanical definition of observables is extended to all properties that can be derived from experimentally measurable quantities with the help of universal operators. Even such an extended definition, however, does not cover several commonly used concepts such as atomic orbitais in molecules or Mulliken atomic charges. Principles of an observable-based interpretation of electronic wavefunctions are outlined. Such an approach avoids ill-defined properties and concepts, therefore minimizing arbitrariness inherent in the interpretation process. Currently known atomic and bond quantities that are observable are reviewed and applied to four "hypervalent" molecules containing sulfur atoms. It is found that the S-O bonds in the molecules under study have highly ionic character and bond orders close to unity. This clear-cut analysis demonstrates that the octet rule is not violated in "hypervalent" compounds with one or two S-O bonds.
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry