What are the spectroscopic properties of the substance with CAS 71 - 23 - 8?
The substance with CAS 71 - 23 - 8 is 1 - Propanol, a simple yet important organic compound. As a reliable supplier of 1 - Propanol, I am well - versed in its various aspects, including its spectroscopic properties. In this blog, I will delve into the key spectroscopic features of 1 - Propanol and also briefly introduce some of our other related products.
Infrared Spectroscopy (IR)
Infrared spectroscopy is a powerful tool for identifying functional groups in a molecule. For 1 - Propanol (C₃H₈O), we can observe several characteristic peaks in its IR spectrum.
The most prominent peak is related to the hydroxyl group (-OH). In the IR spectrum of 1 - Propanol, a broad, strong absorption band appears in the region of 3200 - 3600 cm⁻¹. This broad peak is due to the stretching vibration of the O - H bond. Hydrogen bonding in the alcohol molecule causes the peak to be broad rather than sharp. The hydrogen bonds between the hydroxyl groups of different 1 - Propanol molecules lower the force constant of the O - H bond, resulting in a shift and broadening of the absorption.
There are also peaks associated with the C - H bonds. Aliphatic C - H stretching vibrations occur in the range of 2850 - 3000 cm⁻¹. For 1 - Propanol, we can see multiple peaks in this region corresponding to the different types of C - H bonds in the propyl group. The methylene (-CH₂ -) and methyl (-CH₃) groups contribute to these absorptions.
The C - O stretching vibration gives rise to a peak in the region of 1000 - 1200 cm⁻¹. In 1 - Propanol, the C - O bond in the alcohol functional group shows an absorption around 1050 - 1100 cm⁻¹. This peak is useful for confirming the presence of the alcohol functional group in the molecule.
Nuclear Magnetic Resonance Spectroscopy (NMR)
Nuclear Magnetic Resonance spectroscopy is an essential technique for determining the structure and connectivity of atoms in a molecule. When it comes to 1 - Propanol, both proton NMR (¹H - NMR) and carbon - 13 NMR (¹³C - NMR) provide valuable information.
¹H - NMR
In the ¹H - NMR spectrum of 1 - Propanol, we can distinguish different types of protons based on their chemical environments.
- The hydroxyl proton (OH) typically appears as a broad singlet in the range of 1 - 6 ppm. The exact chemical shift can vary depending on factors such as concentration, temperature, and the presence of other solvents or impurities. The broadness of the peak is due to hydrogen bonding and exchange processes.
- The protons on the methylene group adjacent to the hydroxyl group (-CH₂OH) appear as a multiplet around 3.5 - 4 ppm. The splitting pattern is a result of coupling with neighboring protons.
- The middle methylene group (-CH₂ -) shows a multiplet around 1.5 - 2 ppm. It is coupled to the protons on the adjacent -CH₂OH and -CH₃ groups.
- The protons on the methyl group (-CH₃) appear as a triplet around 0.9 - 1 ppm. The triplet splitting is due to coupling with the two protons on the adjacent -CH₂ - group.
¹³C - NMR
The ¹³C - NMR spectrum of 1 - Propanol has three distinct peaks corresponding to the three different carbon atoms in the molecule.
- The carbon atom of the hydroxyl - bearing carbon (-CH₂OH) appears at a relatively down - field position, typically around 60 - 65 ppm. The electronegative oxygen atom in the hydroxyl group deshields this carbon atom, causing it to have a higher chemical shift.
- The middle carbon atom (-CH₂ -) appears around 25 - 30 ppm.
- The carbon atom of the methyl group (-CH₃) appears at the most up - field position, around 10 - 15 ppm.
Ultraviolet - Visible Spectroscopy (UV - Vis)
1 - Propanol does not have significant absorption in the UV - Vis region under normal conditions. This is because it lacks chromophores, which are groups of atoms in a molecule that can absorb ultraviolet or visible light. Chromophores usually contain π - bonds or conjugated systems. Since 1 - Propanol is a simple aliphatic alcohol with only single bonds and a non - conjugated structure, it does not absorb light in the UV - Vis range between 200 - 800 nm.
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If you are in the market for 1 - Propanol or any of our other chemical products, we invite you to contact us for a procurement discussion. We can offer detailed product information, competitive prices, and reliable delivery services. Our team of experts is ready to assist you in finding the best solutions for your specific needs.
References
- Silverstein, R. M., Webster, F. X., & Kiemle, D. J. (2014). Spectrometric Identification of Organic Compounds. Wiley.
- Pavia, D. L., Lampman, G. M., & Kriz, G. S. (2015). Introduction to Spectroscopy: A Guide for Students of Organic Chemistry. Cengage Learning.
