26 CHARACTERISTIC INFRARED ABSORPTION BANDS OF FUNCTIONAL GROUPS Class of Compounds -Absorption, cm 1 Intensity -Assignment Class of Compounds Absorption, cm 1 Intensity Assignment Alkanes and 2850-3000 s C-H stretch Carboxylic Acids 2500-3500 s, broad O-H stretch Alkyls 1450-1470 s C-H bend R-C(O)-OH 1710-1715 s, broad C=O stretch IR Tables, UCSC Table 1. CLASSIFICATION OF IR BANDS IR bands can be classified as strong (s), medium (m), or weak (w), AN IR SPECTRUM IN TRANSMISSION MODE The graph above shows a spectrum in transmission mode. 46 0 obj <>/Filter/FlateDecode/ID[<6503654DDF3E2744B39B4B0B9B01F464>]/Index[18 55]/Info 17 0 R/Length 126/Prev 209109/Root 19 0 R/Size 73/Type/XRef/W[1 3 1]>>stream w to … 0 endstream endobj 19 0 obj <> endobj 20 0 obj <. eJbc�����;� �g������800d}��QةM��D�W�1���� ���a`�{r?0 �(3� h�b```�VK!��2�0p``X�r`��FCͬ�F���o&��ռZ������e�ҳ��@)� h 28 Ő�� 7����i) ��$20�a�b IR Flowchart to determine functional groups in a compound (all values in cm-1). 18 0 obj <> endobj In this chart, unearned income includes taxable interest, ordinary dividends, and capital gain distributions. 100% transmittance (top of the chart). This is the most commonly used representationand the one found in most chemistry and spectroscopy books. h�bbd```b``��`�-�� fo�L���r0�D2���#�d"X|*�f3�َ`�d��� �;lX}6H/�,! The frequency scale at the bottom of the chart is given in units of reciprocal centimeters (cm-1) rather than Hz, because the numbers are more manageable. endstream endobj startxref [x1�lo���w��ٹ 2d�?�L@�.���8���L,/ A�� A-2 Chart B – For Children and Other Dependents If your parent (or any other taxpayer) may claim you as a dependent, use this chart to see if you must file a return. Characteristic IR Absorption Peaks of Functional Groups* Vibration Position (cm-1) Intensity* Notes Alkanes C-H stretch 2990 – 2850 m to s Alkenes =C-H stretch 3100 – 3000 m C=C stretch 1680 – 1620 (sat.) %%EOF Therefore we will use this representation. Z:\files\classes\spectroscopy\typical spectra charts.DOC IR Flowchart to determine functional groups in a compound (all values in cm-1). 72 0 obj <>stream 1650 – 1600 (conj.) %PDF-1.6 %����

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