Chemistry 2223B Lecture Notes - Ketone, Chemical Formula, Magic 2Ch

• School: Western University
• Department: Chemistry
• Course: Chemistry 2223B
• Professor: Felix Lee

Document Summary

Chemistry 2213a fall 2012 western university. Structure elucidation: ir, 13c-nmr, 1h-nmr: electromagnetic radiation. Regardless of wavelength, all electromagnetic radiation propagates through space at the speed of light (c). It is characterized its wavelength ( in metres) and frequency (oscillations per second, in s 1). The shorter the , the higher the (more waves go by per second if the wavelength is shorter): review of infrared spectroscopy. Ir spectra are normally scanned from 4000 to 600 cm 1 (wavenumbers, which are reciprocal of in cm). Spectra can be divided into the functional group and fingerprint regions. The absorption of ir light causes vibrational excitation. Different functional groups absorb at different wavelengths, which in turn allows the identification of functional groups. Absorption appears as peaks of lowered transmittance. Correlation tables list the characteristic absorptions, as well as their intensities, for various functional groups.