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Related Experiment Videos

Molecular structure and hydrogen bonds in solid dimethylol propionic acid (DMPA).

Zhiyong Ren1, Dezhu Ma, Ying Wang

  • 1Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|September 23, 2003
PubMed
Summary

Dimethylol propionic acid (DMPA) exhibits strong hydrogen bonding in its crystalline form. Temperature and neutralization significantly alter these hydrogen bonds, particularly in the carboxylic group.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Dimethylol propionic acid (DMPA) is a key monomer in polyurethane synthesis.
  • Understanding its hydrogen bonding is crucial for predicting material properties.
  • Previous studies have not fully elucidated the complex H-bond network in DMPA.

Purpose of the Study:

  • To investigate the hydrogen bonding characteristics of DMPA.
  • To determine the influence of temperature, neutralization, and deuteration on DMPA's H-bonds.
  • To assign vibrational bands associated with H-bonding in DMPA.

Main Methods:

  • Infrared (IR) spectroscopy was employed across a temperature range of -150 to 180°C.
  • Spectra were compared before and after neutralization of the carboxylic group.

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  • Partial deuteration of DMPA was performed to analyze hydroxyl group behavior.

    • Main Results:

    • Highly crystallized DMPA shows significant H-bonding with distinct crystal-related bands.
    • Carboxylic acid packing resembles polymers but retains dimer characteristics, including a prominent gammaOH band.
    • All three hydroxyl groups participate in H-bonding, exhibiting unique spectral signatures sensitive to temperature and deuteration.

    Conclusions:

    • DMPA possesses a complex, highly organized H-bond network in its crystalline state.
    • The carboxylic hydroxyl H-bond is more sensitive to external factors than primary hydroxyls.
    • Neutralization induces a distinct H-bonding pattern in the primary hydroxyls.