[In-situ research on Raman spectroscopy of 1-pentanol under high pressure].
Raman spectra in 800-3 000 cm(-1) of 1-pentanol were studied under high pressure and at ambient temperature (23 degrees C) using a cubic zirconia anvil cell. The Raman peaks become sharper at higher pressure so that each individual C-H stretching mode is difficult to be distinguished. The Raman frequencies of the C-H stretching modes shift to a higher position with increasing pressures ranging between 0.1 MPa and 1.75 GPa. And the pressure induced frequency shifts are described by P(MPa) = 69.652 65 x (deltanu(p)) (single, T = 23 degrees C) + 105.806 93 where 0 < (deltanu(p)) single (cm(-1) < or = 23 and P(MPa) =77.974 04 x (Anu(p))( 2 960, T = 23 degrees 95.390 5 where 0 < (deltanu(p))2 960 (cm(-1)) < or = 21 and P(MPa) =126.956 39 x (deltanu(p)) (2 863, T = 23 degrees) -110.648 09 where 0 < (deltanu(p)) 2 863(cm(-1)) < or = 13, respectively. The global slope is (thetanu(single)/thetaP)T (14+/- 1) cm(-)1 x GPa(-1), which can be used as a pressure sensor. Both the jumping of the frequencies and the figure under microscope indicate that the frozen pressure of the 1-pentanol at room temperature is 1.75 GPa. The molar volume change of the 1-pentanol is deltaVm = 1.84 x 10(-6) m3 x mol(-1) in the phase transformation from a liquid to a solid at 23 degrees C.
Tian
Feng
F
The Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China. phengtian@sohu.com
Zheng
Hai-Fei
HF