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Original scientific paper

[NH ... N]+ Hydrogen Bonds in Crystalline Salts of Monoaza- and Diaza-bicyclo[2.2.2]octane

Eugeniusz Grech ; Institute of Chemistry, University of Wroclaw 50-383 Wroclaw, Poland
Zbigniew Malarski ; Institute of Chemistry, University of Wroclaw 50-383 Wroclaw, Poland
Lucjan Sobczyk ; Institute of Chemistry, University of Wroclaw 50-383 Wroclaw, Poland


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Abstract

IR and Raman spectra and phase transitions have been studied
on various salts of azabicyclo[2.2.2]octane (ABCO) and l,4-diazabicyclo[
2.2.2]octane (DABCO) which forms with simple strong
acids adducts of 2 : 1, 1 : 1 and 1 : 2 composition. Only 2 : 1 DABCO
adducts form homoconjugated cations containing [NH · · · H]+ hy- .
drogen bonds close to symmetrical ones, showing broad absorption
in the low frequency region and strong temperature effect. The
Evans holes observed in this case can be ascribed to a coupling
of protonic vibrations with skeletal <58 (N-C3) and bas (N-C3)
modes.

Keywords

Hrčak ID:

194276

URI

https://hrcak.srce.hr/194276

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