Forma, Vol. 32 (Special Issue II), pp. SII11–SII15, 2017

Original Paper

Minimum Change of “Shapes” of Molecular Orbitals in the Elementary Chemical Reactions and a New Perspective of Quantum Chemistry

Hiroyuki Nohira1* and Toshiyuki Nohira2

1Saitama University, Sakuraku, Saitama 338-8570, Japan
2Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan
*E-mail address:

(Received April 26, 2017; Accepted June 22, 2017)

Abstract. Chemical substances are highly diverse. Here, we discuss the regularities of chemical changes among the substances. As a typical example, the regularity of the change between benzene and its structural isomers, i.e. Dewar benzene and prismane, has been discussed in terms of molecular vibrational theory and orbital correlation diagrams. It has been shown that when a certain molecule changes to another one with a similar structure, the “shapes” of the original electronic states are transferred to the next ones with minimum change. Regarding this, it has been pointed out that Neumann-Wigner’s non-crossing rule need not be applied to orbital correlation diagrams. It has also been shown that changes of molecules are “quantized” and cannot be described continuously, i.e. the states which can be accurately described by the Schrödinger equation are limited to “quantum steady states”.

Keywords: Elementary Reaction, Conservation of Orbital Phase, Dynamic Correlation Diagram, Non-crossing Rule, Schrödinger Equation

[Full text] (PDF 348 KB)