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When analyzing an IR spectrum, it is helpful to overlay the diagram below onto the spectrum with our mind to help recognize functional groups. Figure 1. Group frequency and fingerprint regions of the mid-infrared spectrum. The region of the infrared spectrum from 1200 to 700 cm-1 is called the fingerprint region.
Caffeine. Formula: C 8 H 10 N 4 O 2. Molecular weight: 194.1906. IUPAC Standard InChI:InChI=1S/C8H10N4O2/c1-10-4-9-6-5 (10)7 (13)12 (3)8 (14)11 (6)2/h4H,1-3H3 Copy. IUPAC Standard InChIKey:RYYVLZVUVIJVGH-UHFFFAOYSA-N Copy. CAS Registry Number: 58-08-2.
The IR spectrum of caffeine offers a wealth of information about its molecular structure and characteristics. By understanding the peaks and absorption bands, researchers can gain insights into the purity, stability, and therapeutic potential of caffeine-containing products.
Typical IR Absorption Frequencies For Common Functional Groups. Bond. Functional Group. Frequency in cm −1 (Intensity*) C–H. Alkane. 3000–2850 (s) –CH 3. 1450 and 1375 (m)
21 Οκτ 2024 · After completing this section, you should be able to use an infrared spectrum to determine the presence of functional groups, such as alcohols, amines and carbonyl groups, in an unknown compound, given a list of infrared absorption frequencies.
11 Φεβ 2023 · These types of infrared bands are called group frequencies because they tell us about the presence or absence of specific functional groups in a sample. The region of the infrared spectrum from 1200 to 700 cm -1 is called the fingerprint region.
In the long-wave region of the spectrum of caffeine there are bands 423,444, and 482 cm-1 (see Fig. 1). In the same region, for the complex of caffeine with IBr, there are the additional bands 510,469, and
