06 - IR 1 - Infrared Spectroscopy (IR) IR-Hooke's Law _ v=...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Infrared Spectroscopy (IR) IR-Hooke’s Law _ µ π / 2 1 K c v = Where 2 1 2 1 M M M M + = M 1 and M 2 are atomic weights The two atoms that are bonded are treated like a harmonic oscillator (two masses joined by a spring) and K is the force constant
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 IR spectroscopy (cont.) • The units of ν are cm -1 _ Like a frequency but without the speed of light Recall: c= λν
Background image of page 2
3 4000 cm -1 C-N O-H C-O N-H Fingerprint region C-C C-H C N 2500 cm -1 2000 cm -1 1500 cm -1 1000 cm -1 600 cm -1 O Overview of the regions of an IR spectrum IR spectrum of decane
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 IR spectrum of Isooctane Stretching and bending by a CH 2
Background image of page 4
5 The gem-dimethyl doublet IR spectrum of 1-decene
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 IR spectrum of 1-hexyne Alkanes (stretches) C-H stretch is <3000 cm -1 CH 3 asymmetric/symmetric (2960/2870) CH 2 asymmetric/symmetric (2920/2850) Alkanes (bends) 1460 is symmetric bend CH 2 1450 is symmetric bend CH 3 1380 is asymmetric bend CH 3 All wavenumbers are approximate
Background image of page 6
7 Alkenes • C-H stretch is now>3000 cm -1 (~3050) • C=C stretch is ~1650 cm -1 • Out of plane (oop) bends can, in an ideal situation, tell you about the substitution on
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 10
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 10

06 - IR 1 - Infrared Spectroscopy (IR) IR-Hooke's Law _ v=...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online