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 . (Delta(nu p)), Lingle. T=23 degrees C + 105. 806 93 where 0< (Delta(nu p))(single) (cm(-1)) <= 23 and P(MPa) = 77. 974 04 " (Delta(nu p))(2 960) (T=23 degrees C) + 95. 390 5 where 0<(Delta(nu p))(2960) (cm(-1))<= 21 and P(MPa)=126. 956 39 " (Delta(nu p))(2863), (T=23 degrees C) -110. 648 09 where 0<(Delta(nu p))(2863) (cm(-1)) <= 13, respectively. The global slope is (delta nu(single)/dP)T (14 +/- 1)cm(-1) . 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 Delta(Vm)=1. 84x10 m(3) mol(-1) in the phase transformation from a liquid to a solid at 23 degrees C.