TY - JOUR
T1 - Debye relaxation and 250 K anomaly in glass forming monohydroxy alcohols
AU - Bauer, S.
AU - Burlafinger, K.
AU - Gainaru, C.
AU - Lunkenheimer, P.
AU - Hiller, W.
AU - Loidl, A.
AU - Böhmer, R.
PY - 2013/3/7
Y1 - 2013/3/7
N2 - A previous dielectric, near-infrared (NIR), and nuclear magnetic resonance study on the hydrogen-bonded liquid 2-ethyl-1-hexanol C. Gainaru, Phys. Rev. Lett. 107, 118304 (2011)10.1103/PhysRevLett.107.118304 revealed anomalous behavior in various static quantities near 250 K. To check whether corresponding observations can be made for other monohydroxy alcohols as well, these experimental methods were applied to such substances with 5, 6, 7, 8, and 10 carbon atoms in their molecular backbone. All studied liquids exhibit a change of behavior near 250 K, which is tentatively ascribed to effects of hydrogen bond cooperativity. By analyzing the NIR band intensities, a linear cluster size is derived that agrees with estimates from dielectric spectroscopy. All studied alcohols, except 4-methyl-3-heptanol, display a dominant Debye-like peak. Furthermore, neat 2-ethyl-1-butanol exhibits a well resolved structural relaxation in its dielectric loss spectrum, which so far has only been observed for diluted monohydroxy alcohols.
AB - A previous dielectric, near-infrared (NIR), and nuclear magnetic resonance study on the hydrogen-bonded liquid 2-ethyl-1-hexanol C. Gainaru, Phys. Rev. Lett. 107, 118304 (2011)10.1103/PhysRevLett.107.118304 revealed anomalous behavior in various static quantities near 250 K. To check whether corresponding observations can be made for other monohydroxy alcohols as well, these experimental methods were applied to such substances with 5, 6, 7, 8, and 10 carbon atoms in their molecular backbone. All studied liquids exhibit a change of behavior near 250 K, which is tentatively ascribed to effects of hydrogen bond cooperativity. By analyzing the NIR band intensities, a linear cluster size is derived that agrees with estimates from dielectric spectroscopy. All studied alcohols, except 4-methyl-3-heptanol, display a dominant Debye-like peak. Furthermore, neat 2-ethyl-1-butanol exhibits a well resolved structural relaxation in its dielectric loss spectrum, which so far has only been observed for diluted monohydroxy alcohols.
UR - http://www.scopus.com/inward/record.url?scp=84874878966&partnerID=8YFLogxK
U2 - 10.1063/1.4793469
DO - 10.1063/1.4793469
M3 - Article
C2 - 23485311
AN - SCOPUS:84874878966
SN - 0021-9606
VL - 138
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
IS - 9
M1 - 094505
ER -