14C_s10_lec01_e02_data

14C_s10_lec01_e02_data - Natural Abundance of Important...

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Natural Abundance of Important Isotopes 1 H (99.985%), 2 H (0.015%) 32 S (95.0%), 33 S (0.76%), 34 S (4.22%) 12 C (98.893%), 13 C (1.107%) 35 Cl (75.77%), 37 Cl (24.23%) 14 N (99.634%), 15 N (0.366%) 79 Br (50.69%), 81 Br (49.31%) 16 O (99.759%), 17 O (0.037%), 18 O (0.204%) 127 I (100%) 19 F (100%) Characteristic Infrared Stretching Frequencies Functional Group Bond Stretching, cm -1 Intensity alcohol O–H 3650 – 3200 strong, broad (H-bonded) amine, amide N–H 3500 – 3200 medium, often broad alkyne C–H 3340 – 3250 strong aryl, vinyl =C–H 3100 – 3000 variable carboxylic acid O–H 3000 – 2500 strong, broad alkane sp 3 C–H 2960 – 2850 variable; usually strong aldehyde sp 2 C–H ~2900 and ~2700 medium, 2 bands nitrile C N 2260 – 2220 variable alkyne C C 2260 – 2000 variable ester C=O 1750 – 1735 strong aldehyde C=O 1740 – 1720 strong ketone C=O 1750 – 1705 strong carboxylic acid C=O 1725 – 1700 strong amide C=O 1690 – 1650 strong alkene C=C 1680 – 1620 variable benzene ring C=C 1600 and 1500 – 1450 variable; 1600 often 2 bands Characteristic Proton NMR Chemical Shifts (ppm) RC H 3 0.9 RC C H 2.5 benzene– H 6.5 – 8 RC H 2 R acyclic 1.3 RNHC H 3 2 – 3 aldehyde RC H O 9.5 – 11 RC H 2 R cyclic 1.5 RC
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14C_s10_lec01_e02_data - Natural Abundance of Important...

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