Solid state 13C-NMR and X-ray studies on the structure of tetraethylpyrazabole

Marek Dąbrowski , Janusz Serwatowski , Janusz Zachara , Anna Rufińska


DSC measurements of 4,4,8,8-tetraethylpyrazabole (2) show a high enthalpy phase transition in the solid state (ΔH=28.61 kJ mol−1) at 69.0°C, far from its melting point at 106°C with ΔH=3.22 kJ mol−1. 13C-CP/MAS spectra of 2 show that at 69°C the ethyl groups attached to boron atoms start to rotate around the CB bond and the whole molecule starts to rotate and to move changing its conformation from one boat to another. X-ray studies confirm its boat conformation in the solid state at room temperature.
Author Marek Dąbrowski (FC / DPC)
Marek Dąbrowski,,
- Department Of Physical Chemistry
, Janusz Serwatowski (FC / DPC)
Janusz Serwatowski,,
- Department Of Physical Chemistry
, Janusz Zachara (FC / CICSST)
Janusz Zachara,,
- Chair Of Inorganic Chemistry And Solid State Technology
, Anna Rufińska - [Max Planck Institut für Kohlenforschung]
Anna Rufińska,,
Journal seriesJournal of Organometallic Chemistry, ISSN 0022-328X
Issue year2000
Keywords in EnglishConformational study, Differential scanning calorimetry, Tetraethylpyrazabole
ASJC Classification2505 Materials Chemistry; 1604 Inorganic Chemistry; 1605 Organic Chemistry; 1606 Physical and Theoretical Chemistry; 1303 Biochemistry
Languageen angielski
Score (nominal)30
Score sourcejournalList
Publication indicators Scopus Citations = 4; WoS Citations = 4; GS Citations = 4.0; Scopus SNIP (Source Normalised Impact per Paper): 2000 = 0.78; WoS Impact Factor: 2006 = 2.332 (2) - 2007=2.097 (5)
Citation count*4 (2015-04-26)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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