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Introduction to Spectroscopy by Donald L. Pavia, Gary M. Lampman, George S. Kriz, James A.

By Donald L. Pavia, Gary M. Lampman, George S. Kriz, James A. Vyvyan

- most up-to-date SPECTRA recommendations: presents with the newest spectra ideas, present in Appendix 10,
"Index of Spectra".
- smooth insurance: The e-book offers a contemporary presentation on one-dimensional NMR spectroscopy.
- distinct assurance: The mass spectrometry fabric in bankruptcy eight offers an in depth examine biological
molecules for the most recent insurance in this very important topic.
- most recent SPECTRA ideas: the most recent spectra ideas are supplied in Appendix 10, "Index of Spectra".
- updated SPECTROGRAPHS: in the course of the textual content, spectrographs are created with the most recent suggestions to
confirm accuracy.

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16 shows the entire CIH stretching region. Except for the aldehyde hydrogen, an absorption frequency of less than 3000 cm−1 usually implies a saturated compound (only sp3-1s hydrogens). An absorption frequency higher than 3000 cm−1 but not above about 3150 cm−1 usually implies aromatic or vinyl hydrogens. However, cyclopropyl CIH bonds, which have extra s character because of the need to put more p character into the ring CIC bonds to reduce angle distortion, also give rise to absorption in the region of 3100 cm−1.

May not be copied, scanned, or duplicated, in whole or in part. 5 3 4 5 6 MICRONS 7 8 9 10 11 12 13 14 15 16 19 35 25 90 % TRANSMITTANCE 80 70 No C– –C stretch 60 50 40 sp3 C–H stretch 30 20 CH3CH2CH2–C– –C–CH2CH2CH3 10 0 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 WAVENUMBERS (CM–1) 1000 800 600 400 F I G U R E 2 . 1 3 The infrared spectrum of trans-2-pentene (neat liquid, KBr plates). C. Alkynes Terminal alkynes will show a prominent peak at about 3300 cm−1 for the sp-hybridized CIH. A CK C will also be a prominent feature in the spectrum for the terminal alkyne, appearing at about 2150 cm−1.

5 A comparison of the intensities of the CJO and CJ C absorption bands. Copyright 2013 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. 5 3600 3200 2800 WAVENUMBERS (CM–1) 0 2400 4000 3600 3200 2800 WAVENUMBERS (CM–1) 2400 F I G U R E 2 . 6 A comparison of the shapes of the absorption bands for the OIH and NIH groups. the NIH absorption usually has one or two sharp absorption bands of lower intensity, whereas OIH, when it is in the NIH region, usually gives a broad absorption peak.

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