University:
Swansea University
Course:
PM134 | Microbiology
Academic year:

2023
Views:

230

Pages:

2
Author:

Sanjeev K

IR Spectrum of Alkenes. Has C-H bunds, aleo has sharp, medium bande corresp wrresponding tu C=C bond stretching Vibration et about 1600-1700 unt Some alkenes might also show a band for the might Stretch, appearing around 3080 cm-l. =C-H bund However, thie band Wuld be obscured bands appearing around 3000 usl IR Spectrum of Alkynes. by the broader The most prominent band in alkynes corresponds to the Carbon-Carbon triple bund. It shows as a sharp, weak band at about 2100 cm. The reason it's weak is that the biple bund is not very Polon. In some cases, such as in Symmetrical alkynes, the highly hot band may not show at all due to the low Polarity of the triple bond associated with those alkynes. Termural alkyne, that is to say those where the triple bond B ad the end of a carbon chain, have C-H bond involving the sp carbon (the carbon that forms poort of the triple bond). Therefore they may also Shows a sharp, weak band ad about 3300 um corresponding to the C-H stretch. Internal alkynes, that is those where the hiple bond is in the middle of a carbon chain, do not have (-H bonds to The finger Print Region. Though the entire IR spectrum can be used as a fingerprint for the purpose of comparing molecules, 600-1400 cm Ps is called the fingerprint region. The spectrum is normally a complex crea frequently overlapping Pu use. It shows many bands, cach otha "The complexity limit." to that of a fingerprint and should be ignored by beginners when analyzing the Spectrum. IR Spectron of Alkanes Alkanes No functional gp. IR spectrum andy displays only C-C and C-H bondo- Vibrations - Most useful is the C-H bands that appear around 3000 cm. Since most organic molecules have such bonds, most Organe molecule will display those bande in ther. Spectrum.