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OH-stretching in synthetic hydrogen-bonded chains
C P van der Vegte1, S Knop, P Vöhringer
1Zernike Institute for Advanced Materials, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands.
The Journal of Physical Chemistry. B
|May 14, 2014
Summary
We investigated hydrogen bond dynamics in polyalcohols using spectroscopy and simulations. The all-syn polyalcohol exhibits stable hydrogen bonds and faster excitation delocalization, unlike the all-anti variant.
Area of Science:
- Physical Chemistry
- Spectroscopy
- Computational Chemistry
Background:
- Hydrogen bond dynamics are crucial for molecular function.
- Stereochemistry significantly influences molecular structure and interactions.
- Understanding polyalcohol behavior requires detailed analysis of hydrogen bonding.
Purpose of the Study:
- To elucidate hydrogen bond dynamics in stereoselectively synthesized polyalcohols.
- To correlate structural differences with spectroscopic and dynamic properties.
- To investigate excitation delocalization in different polyalcohol configurations.
Main Methods:
- Combining linear and two-dimensional infrared (2D IR) spectroscopy experiments.
- Performing computational simulations for molecular dynamics.
- Analyzing spectral differences arising from stereochemistry.
Main Results:
- Two polyalcohol variants (all-syn and all-anti tetrol) exhibit distinct hydrogen bond dynamics.
- The all-syn variant shows stable hydrogen-bonded chains, while the all-anti variant has dynamic hydrogen bonds.
- Stronger hydrogen bonding in all-syn leads to faster site frequency fluctuations and homogeneous broadening in 2D spectra.
- Enhanced coupling in all-syn results in faster excitation delocalization and pump-frequency independent vibrational lifetime.
Conclusions:
- Stereochemistry dictates hydrogen bond stability and dynamics in polyalcohols.
- Differences in hydrogen bonding and coupling strength explain observed spectroscopic and dynamic variations.
- Excitation delocalization is sensitive to molecular structure and hydrogen bond network integrity.
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