Related Experiment Video
Updated: Aug 29, 2025
10:28
Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
Published on: May 27, 2018
8.9K
Hydrogen bonding network dynamics of 1,2-propanediol-water binary solutions by Raman spectroscopy and stimulated
Yang Xu1, Lu Xing1, Xianwen Cao1
1Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|September 9, 2022
Summary
Investigating hydrogen bonding in 1,2-propanediol (1,2-PD) and water mixtures reveals a structural transition at 0.4 volume fraction of 1,2-PD. This shift alters hydrogen bond strength and forms ice-like structures, impacting alcohol-water interactions.
Area of Science:
- Physical Chemistry
- Spectroscopy
- Materials Science
Background:
- Hydrogen bonding (HB) networks are crucial in determining the properties of alcohol-water binary solutions.
- Understanding these networks is essential for various applications, including chemical processes and material design.
Purpose of the Study:
- To investigate the hydrogen bonding (HB) network in 1,2-propanediol (1,2-PD)-water binary solutions.
- To identify structural transitions and changes in HB strength as a function of 1,2-PD concentration.
Main Methods:
- Utilized Raman spectroscopy to analyze changes in HB strength.
- Employed stimulated Raman scattering (SRS) to detect structural alterations and new hydrogen bond formations.
- Analyzed spectral data to identify characteristic peaks related to hydrogen bond configurations.
Main Results:
- Observed abnormal changes in hydrogen bonds at a 1,2-PD volume fraction (V1,2-PD) of 0.4.
- Raman spectroscopy indicated a weakening followed by strengthening of water's HB strength with increasing 1,2-PD.
- SRS revealed new peaks (3283 cm-1 and 3319 cm-1), signifying ice-like structures and weakened HBs.
Conclusions:
- A significant HB structural transition from H2O-H2O to H2O-1,2-PD occurs at V1,2-PD = 0.4.
- The study provides critical insights into the complex HB dynamics in alcohol-water systems.
- Findings serve as a valuable reference for future research on HB networks in similar binary solutions.
Related Concept Videos
01:23IR Spectrum Peak Broadening: Hydrogen Bonding
1.1K
The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...
1.1K
00:48¹H NMR of Labile Protons: Deuterium (²H) Substitution
952
This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
952
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
8.6K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.6K
01:10¹H NMR of Labile Protons: Temporal Resolution
1.2K
Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
1.2K
01:24π Molecular Orbitals of 1,3-Butadiene
9.6K
Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
9.6K
01:04Hydrogen Bonds
9.2K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
9.2K