Lecture 2 Spring 09 preview

Lecture 2 Spring 09 preview - Lecture 2 Chemistry 310N...

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Lecture 2 Chemistry 310N Organic Chemistry II for Prehealth Professionals nique number: 3185 Unique number: 53185 Tu,Th 12:30-2:00 pm, Welch 2.224 Professor: Jonathan Sessler, Ph.D. sessler@mail.utexas.edu
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Expected Course Outline (Based on Brown, Foote, Iverson, and Anslyn 5th Ed. text) Unit 1: IR Spectroscopy, NMR Spectroscopy, and Mass Spectrometry Chapters 12-14 nit 2: rganometallic Chemistry and Aldehydes and Ketones Unit 2: Organometallic Chemistry and Aldehydes and Ketones Chapters 15 and 16 Unit 3: Carboxylic Acids and Their Derivatives hapters 17 and 18 Chapters 17 and 18 Unit 4: Enolate Anions and Enamines Chapter 19 Unit 5: Review of Conjugation and Introduction to Aromaticity Chapters 20 and 21 Unit 6: Chemistry of Benzene Derivatives Chapter 22 Unit 7: Chemistry of Amines and their Derivatives Chapter 23 Unit 8: Introduction to Synthesis Chapter 24 Unit 9: Introduction to Carbohydrates and Brief Overview of Bioorganic Chemistry Chapter 25 and Selected Portions of Chapters 26-28 Unit 10: As time permits: Introduction to Polymer Chemistry Chapter 29
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Chapter 12 Infrared Spectroscopy
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olecular Spectroscopy Molecular Spectroscopy Molecular spectroscopy The study of which frequencies of electromagnetic radiation are absorbed or emitted by particular substance and the correlation of these a particular substance and the correlation of these frequencies with details of molecular structure. e study three types of molecular spectroscopy we study three types of molecular spectroscopy Absorption of Electromagnetic Region of the Nuclear spin states Radio frequency Radiation Results in Transition Between Electromagnetic Spectrum Nuclear magnetic Type of Spectroscopy Frequency (hetz) 3 x10 7 -9x10 8 lectronic energy levels Infrared ltraviolet- resonance Infrared ltraviolet 4 5 1 x10 13 -1x10 14 Vibrational energy levels Electronic energy levels Ultraviolet- visible Ultraviolet- visible 2.5 x10 14 -1.5x10 15
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Electromagnetic Radiation ect o ag et c ad at o • Electromagnetic radiation: Electromagnetic radiation: Light and other forms of radiant energy. • Wavelength ( Wavelength ( λ ): The distance between consecutive peaks on a wave. • Frequency ( Frequency ( ν ): The number of full cycles of a wave that pass a given point in a second (sec. or ) and is reported in hertz which has the units of s) and is reported in hertz, which has the units of s -1 . ertz (Hz): he unit in which radiation frequency • Hertz (Hz): Hertz (Hz): The unit in which radiation frequency is reported: s -1 (read “per second”).
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lectromagnetic Radiation Electromagnetic Radiation • Common units used to express wavelength ( λ ) Relation to Meter Unit ---- λ 1 mm = 10 -3 m 1 µ m = 10 -6 m Micrometer ( µ m) Millimeter (mm) Meter (m) Angstrom (Å) 1 Å = 10 -10 m 1 nm = 10 -9 m Nanometer (nm)
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Some things to keep in mind: E = h ν where h = Planck’s constant (6.6 x 10 -27 ergsec) and ν is frequency in sec -1 and λν = c Where λ is wavelength in cm and C = speed of light (2.998 x 10 10 cmsec -1 ) This means energy is proportional to 1/ λ and can be expressed as cm -1 fact, E in Kcal/mole = (2.857 x 10 -3 In fact, E in Kcal/mole (2.857 x 10 ) ν /c But, for organic chemistry (esp. IR spectroscopy), just remember that a high value of cm -1 means high energy.
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Lecture 2 Spring 09 preview - Lecture 2 Chemistry 310N...

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