J. Reuter, D. Büsing, J. Tamarit
1997
Citations
0
Influential Citations
21
Citations
Journal
Journal of Materials Chemistry
Abstract
Pressure–temperature phase diagrams of thetert-butyl compounds (Bu t X) pivalic acid (X=CO 2 H), 2-methylpropane-2-thiol (X=SH) and tert-butylamine (X=NH 2 ) have been determined at temperatures between 100 K and the melting curve and up to 300 MPa with the aid of differential thermal analysis (DTA) under pressure. New normal as well as high-pressure induced phases have been found for 2-methylpropane-2-thiol and tert-butylamine. The results for the studied compounds are compared to those previously obtained for compounds belonging to the same tert-butyl family (i.e. X=Cl, Br, CH 2 OH, NO 2 , Me and CN) in order to establish similar trends in the phase behaviour as well as in the thermodynamic properties of the phase transitions. For the related tert-butyl compounds, with the exception of the X=CN compound, the average of the slopes (dT/dp) of the melting and the II to I transition curves have been determined to be (0.64±0.14) and (0.27±0.13) K MPa -1 respectively.