Hey there! As a supplier of p-Bromobenzaldehyde, I'm super excited to dive into the spectroscopic characteristics of this compound with you. p-Bromobenzaldehyde is a pretty cool chemical, and understanding its spectroscopic features can be really helpful for a bunch of applications, from pharmaceuticals to chemical research.
Let's start with the basics. p-Bromobenzaldehyde has the molecular formula C₇H₅BrO. It consists of a benzene ring with a bromine atom and an aldehyde group attached at the para positions. This structure plays a huge role in determining its spectroscopic properties.
Infrared (IR) Spectroscopy
In IR spectroscopy, we're looking at how the molecule absorbs infrared light, which causes the bonds in the molecule to vibrate. For p-Bromobenzaldehyde, there are several key absorption peaks that we can observe.
One of the most distinctive peaks is around 1700 cm⁻¹. This peak corresponds to the stretching vibration of the carbonyl group (C=O) in the aldehyde functional group. The carbonyl group is a really important part of p-Bromobenzaldehyde, and this peak is a dead giveaway for its presence.
Another important set of peaks is in the range of 3000 - 3100 cm⁻¹. These peaks are due to the stretching vibrations of the C-H bonds in the benzene ring. The benzene ring is a stable and characteristic part of p-Bromobenzaldehyde, and these peaks help us confirm its aromatic nature.
We also see peaks around 1450 - 1600 cm⁻¹, which are associated with the skeletal vibrations of the benzene ring. These vibrations are a result of the carbon - carbon double bonds in the ring, and they give us more information about the structure of the aromatic part of the molecule.
Nuclear Magnetic Resonance (NMR) Spectroscopy
NMR spectroscopy is a powerful tool for determining the structure of organic compounds. For p-Bromobenzaldehyde, we can use both ¹H NMR and ¹³C NMR to get a detailed picture of its molecular structure.
In ¹H NMR, the aldehyde proton (-CHO) shows up as a singlet around 10 ppm. This is a very characteristic peak for aldehydes, and it's easy to spot. The protons on the benzene ring also give us some interesting information. The protons on the carbons adjacent to the bromine and aldehyde groups have different chemical shifts due to the electron - withdrawing effects of these groups.
The protons on the carbon next to the bromine atom are deshielded, and they appear at a higher chemical shift compared to the other protons on the benzene ring. The protons on the carbon next to the aldehyde group are also deshielded, but to a different extent. By analyzing the chemical shifts and splitting patterns of these protons, we can determine the substitution pattern on the benzene ring.
In ¹³C NMR, the carbonyl carbon of the aldehyde group shows up at around 190 ppm. This is a very downfield shift, which is characteristic of carbonyl carbons. The carbons in the benzene ring also have distinct chemical shifts. The carbon attached to the bromine atom has a different chemical shift compared to the other carbons in the ring, and this helps us confirm the para - substitution pattern.
Ultraviolet - Visible (UV - Vis) Spectroscopy
UV - Vis spectroscopy is used to study the absorption of ultraviolet and visible light by molecules. p-Bromobenzaldehyde has a characteristic absorption in the UV region due to the presence of the benzene ring and the carbonyl group.
The benzene ring has a π - π* transition, which results in an absorption peak around 250 - 260 nm. The carbonyl group also contributes to the absorption in the UV region, and it can cause a shift in the absorption peak depending on its interaction with the benzene ring.
The UV - Vis spectrum of p-Bromobenzaldehyde can be used to determine its concentration in a solution, as well as to study its interactions with other molecules. For example, if p-Bromobenzaldehyde reacts with another compound, the UV - Vis spectrum may change, indicating a chemical reaction has occurred.
Mass Spectrometry (MS)
Mass spectrometry is used to determine the molecular mass and structure of a compound. In the mass spectrum of p-Bromobenzaldehyde, the molecular ion peak (M⁺) appears at m/z = 184 (for the most abundant isotope). This peak corresponds to the intact molecule of p-Bromobenzaldehyde.
We also see fragmentation peaks in the mass spectrum. For example, there may be a peak at m/z = 105, which corresponds to the loss of the bromine atom and the aldehyde group from the molecule. By analyzing these fragmentation patterns, we can get more information about the structure of p-Bromobenzaldehyde.
Applications and Related Compounds
p-Bromobenzaldehyde has a wide range of applications in the pharmaceutical and chemical industries. It can be used as an intermediate in the synthesis of various drugs and fine chemicals. For example, it can be used in the synthesis of Methyl 3-aminocrotonate, which is an important pharmaceutical intermediate.
It can also be used in the synthesis of 4-Bromobenzoic Acid and 4-Bromobenzonitrile, which are also useful compounds in the chemical industry.
Conclusion
So, there you have it! The spectroscopic characteristics of p-Bromobenzaldehyde are really fascinating. From the IR peaks that tell us about its functional groups to the NMR signals that give us detailed structural information, each spectroscopic technique provides valuable insights into this compound.
If you're in the market for high - quality p-Bromobenzaldehyde or have any questions about its applications, don't hesitate to reach out. We're here to help you with all your chemical needs. Whether you're a researcher working on a new drug or a chemical manufacturer looking for a reliable supplier, we've got you covered.
Let's start a conversation and see how we can work together to meet your requirements. We're committed to providing the best products and services, and we look forward to hearing from you.
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., & Engel, R. G. (2015). Introduction to Spectroscopy: A Guide for Students of Organic Chemistry. Cengage Learning.