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.
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