Solid state 13C-NMR and X-ray studies on the structure of tetraethylpyrazabole
Marek Dąbrowski , Janusz Serwatowski , Janusz Zachara , Anna Rufińska
AbstractDSC 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 CB 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.
|Journal series||Journal of Organometallic Chemistry, ISSN 0022-328X|
|Keywords in English||Conformational study, Differential scanning calorimetry, Tetraethylpyrazabole|
|ASJC Classification||; ; ; ;|
|Publication indicators||= 4; = 4; = 4.0; : 2000 = 0.78; : 2006 = 2.332 (2) - 2007=2.097 (5)|
|Citation count*||4 (2015-04-26)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.