scholarly journals Ultrafast 2D IR anisotropy of water reveals reorientation during hydrogen-bond switching

2011 ◽  
Vol 135 (5) ◽  
pp. 054509 ◽  
Author(s):  
Krupa Ramasesha ◽  
Sean T. Roberts ◽  
Rebecca A. Nicodemus ◽  
Aritra Mandal ◽  
Andrei Tokmakoff
Keyword(s):  
Hydrogen Bond ◽  
2D Ir

scholarly journals The structure of salt bridges between Arg+ and Glu− in peptides investigated with 2D-IR spectroscopy: Evidence for two distinct hydrogen-bond geometries

2015 ◽  
Vol 142 (21) ◽  
pp. 212444 ◽  
Author(s):  
Adriana Huerta-Viga ◽  
Saeed Amirjalayer ◽  
Sérgio R. Domingos ◽  
Heleen Meuzelaar ◽  
Alisa Rupenyan ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Ir Spectroscopy ◽  
Salt Bridges ◽  
2D Ir

scholarly journals An Ultrafast Vibrational Study of Dynamical Heterogeneity in the Protic Ionic Liquid Ethyl-Ammonium Nitrate

2019 ◽  
Author(s):  
Clinton Johnson ◽  
Anthony W. Parker ◽  
Paul M. Donaldson ◽  
Sean Garrett-Roe
Keyword(s):  
Hydrogen Bond ◽  
Ammonium Nitrate ◽  
Spectral Diffusion ◽  
Relaxation Rates ◽  
Protic Ionic Liquid ◽  
Dynamical Heterogeneity ◽  
Polarization Control ◽  
2D Ir ◽  
Jump Model ◽  
Rotational Components

<p>Using ultrafast two-dimensional infrared spectroscopy (2D-IR), a vibrational probe (thiocyanate, SCN<sup>-</sup>) was used to investigate the hydrogen bonding network of a molten salt (ethyl-ammonium nitrate, EAN) compared to that of H2O. The 2D-IR experiments were performed in both parallel () and perpendicular () conditions along with temperature dependence for both EAN (14-130 ˚C) and H2O (5-89 ˚C). With polarization control, the frequency fluctuation correlation function can be separated into structural and rotational components. An Arrhenius analysis lead to independent activation energies for the isotropic, and anisotropic signals, structural spectral diffusion, and rotational induced spectral diffusion. The rotational E<sub>a</sub>s were similar for both EAN and H2O suggesting that SCN<sup>-</sup> is experiencing a similar jump model, i.e. where hydrogen bond reorientation is dominated by large angular jumps stemming from molecular rotation dynamics. The frequency pre-factors, however, were different where the more rigid and vicious EAN had a slower rate. Furthermore, the 2D-IR anisotropy and vibrational relaxation rates of EAN are frequency dependent, revealing that SCN<sup>-</sup> experiences two subensembles. We suggest that the sub-ensemble with a faster rotational timescale correlates to SCN<sup>-</sup> with more, weaker hydrogen bonds, and the sub-ensemble with a slower rotational timescale correlates to SCN<sup>-</sup> with a stronger, more directional hydrogen bond.</p>

scholarly journals Hydrogen Bond Rearrangements in Water Probed with Temperature-Dependent 2D IR

2010 ◽  
Vol 1 (7) ◽  
pp. 1068-1072 ◽  
Author(s):  
Rebecca A. Nicodemus ◽  
Krupa Ramasesha ◽  
Sean T. Roberts ◽  
Andrei Tokmakoff
Keyword(s):  
Hydrogen Bond ◽  
Temperature Dependent ◽  
2D Ir

2D-IR spectroscopy of hydrogen-bond-mediated vibrational excitation transfer

2016 ◽  
Vol 18 (20) ◽  
pp. 13852-13860 ◽  
Author(s):  
Lev Chuntonov
Keyword(s):  
Hydrogen Bond ◽  
Energy Transfer ◽  
Ir Spectroscopy ◽  
Methyl Acetate ◽  
Vibrational Energy ◽  
Vibrational Excitation ◽  
Excitation Transfer ◽  
Vibrational Energy Transfer ◽  
Dual Frequency ◽  
2D Ir

Inter-molecular vibrational energy transfer in the hydrogen-bonded complexes of methyl acetate and 4-cyanophenol is studied by dual-frequency 2D-IR spectroscopy.

Dual-Frequency 2D IR Photon Echo of a Hydrogen Bond

2005 ◽  
pp. 539-541
Author(s):  
Igor V. Rubtsov ◽  
Keshav Kumar ◽  
Robin M. Hochstrasser
Keyword(s):  
Hydrogen Bond ◽  
Photon Echo ◽  
Dual Frequency ◽  
2D Ir
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