On a “Critical” Behaviour of Strong Hydrogen Bonds

  • L. Sobczyk

Abstract

It is well known that in the case of chemically symmetric OHO hydrogen bonds there is some transition range of bridge length at which an unusual behaviour is observed. This is reflected on various correlation curves of isotopic effects (Ichikawa, 1978). One should emphasize here the isotopic effect upon the bridge length, the isotopic ratio in IR spectra and the isotopic effect on the ferroelectric phase transition temperature in hydrogen bonded crystals. The OHO bridge length at which various anomalies can occur equals to about 2.50 A. One can suppose that in such H-bond length region a transition from an asymmetric single minimum to symmetric bond takes place. This transition state corresponds to the bridges with double minimum potential for the proton motion. Such a state can also be defined as a “critical” (Johnson, Rumon et al., 1985) in a sense that under influence of external fields it can easily be transformed to longer asymmetric or shorter symmetric single minimum bridge. Matsushita and Matsubara (1982) claim that isotopic anomalies arise from the tunneling effects. The aim of the present contribution is to discuss the critical behaviour of hydrogen bonds other than OHO and particularly NHN and OHN bridges for which some new results were recently obtained in our laboratory

Keywords

Microwave Hydrate Pyridine Adduct Naphthalene 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1987

Authors and Affiliations

  • L. Sobczyk
    • 1
  1. 1.Institute of ChemistryUniversity of WrocławWrocławPoland

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