nonrigid$53564$ - определение. Что такое nonrigid$53564$
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Что (кто) такое nonrigid$53564$ - определение

MOLECULES WHOSE ATOMS INTERCHANGE BETWEEN SYMMETRIC POSITIONS
Fluxional; Fluxionality; Semi-rigid molecule; Floppy molecule; Non-rigid molecules; Fluxional molecules; Coalescence temperature; DNMR; Dynamic NMR spectroscopy; Dynamic NMR spectrum; Ring whizzer; Ring whizzing mechanism; Stereochemical nonrigidity; Stereochemically nonrigid; Stereodynamic
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  • The structure of the ring whizzer Fe(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>) (η<sup>1</sup>-C<sub>5</sub>H<sub>5</sub>)(CO)<sub>2</sub>.
  • Iron-pentacarbonyl-Berry-mechanism

fluxional         
¦ adjective
1. subject to flux.
2. Mathematics, dated relating to fluxions.
Fluxional molecule         
In chemistry and molecular physics, fluxional (or non-rigid) molecules are molecules that undergo dynamics such that some or all of their atoms interchange between symmetry-equivalent positions. Because virtually all molecules are fluxional in some respects, e.
Fluxional         
·adj Pertaining to, or having the nature of, fluxion or fluxions; variable; inconstant.

Википедия

Fluxional molecule

In chemistry and molecular physics, fluxional (or non-rigid) molecules are molecules that undergo dynamics such that some or all of their atoms interchange between symmetry-equivalent positions. Because virtually all molecules are fluxional in some respects, e.g. bond rotations in most organic compounds, the term fluxional depends on the context and the method used to assess the dynamics. Often, a molecule is considered fluxional if its spectroscopic signature exhibits line-broadening (beyond that dictated by the Heisenberg uncertainty principle) due to chemical exchange. In some cases, where the rates are slow, fluxionality is not detected spectroscopically, but by isotopic labeling and other methods.