Signal Characteristics (Intensity) - Lecture Notes | Lecture Note - Edubirdie

University:
York University
Course:
CHEM 1000 | Chemical Structure
Academic year:

2021
Views:

102

Pages:

4
Author:

Niklas

14.4: Signal Characteristics: Intensity Primary Driver: GREATER BOND POLARITY = STRONGER IR SIGNALS two wave patterns representing bond vibrations Low dipole moment (Δμ) = small IR signal High dipole moment (Δμ) = large IR signal 100 80 60 40 20 0 1800 1700 1600 Wavenumber (cm-1) 100 80 60 40 20 0 4000 3500 3000 2500 2000 1500 1000 500 Wavenumber (cm-1) NO SIGNAL H-C=C-H H-C≡C-H If a bond is completely symmetrical, then a stretching frequency is NOT observed in the IR spectrum.

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