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110-170
180-190
160-180
155-185
100-150
10-30
15-55
20-60
30-50
50-70
50-75
10-65
160-180
200-220
1
1.4
1.6
1.9
2-2.5
2.5-3
3-4
4.5-5
5-5.5
4.5-7
6-8.5
5.5-8.5
9.5-10.5
10-13
170
N-H
3500
O-H
3100, very broad
sp3 C-H
3000
C=C
2000
aromatic
1500
C=O
1600
C=C
1550
Explain why TMS is used as the reference in 13C and 1H NMR?
TMS is used because it presents the most shielded signals (Si is less electronegative than C)
define auxochrome
does not absorb the wavelength by itself but affects the overall absorbance of the chromophore.
explain why deuterated solvent is used in NMR
because if the solvent contains protons they would overpower the compounds signals and they would be hard to see
