High-pressure Raman spectroscopy of tris(hydroxymethyl)aminomethane.
High-pressure Raman spectroscopy has been used to study tris(hydroxymethyl)aminomethane (C(CH(2)OH)(3)NH(2), Tris). Molecules with globular shapes such as Tris have been studied thoroughly as a function of temperature and are of fundamental interest because of the presence of thermal transitions from orientational order to disorder. In contrast, relatively little is known about their high-pressure behavior. Diamond anvil cell techniques were used to generate pressures in Tris samples up to approximately 10 GPa. A phase transition was observed at a pressure of approximately 2 GPa that exhibited relatively slow kinetics and considerable hysteresis, indicative of a first-order transition. The Raman spectrum becomes significantly more complex in the high-pressure phase, indicating increased correlation splitting and significant enhancement in the intensity of some weak, low-pressure phase Raman-active modes.
Emmons
Erik D
ED
Division of Materials Science, MS 388, University of Nevada, Reno, Reno, Nevada 89557, USA.
Fallas
Juan C
JC
Kamisetty
Vamsi K
VK
Chien
Wen-Ming
WM
Covington
Aaron M
AM
Chellappa
Raja S
RS
Gramsch
Stephen A
SA
Hemley
Russell J
RJ
Chandra
Dhanesh
D