# 318-2 - CH 318 N Textbook Assignment Chapter 12 LECTURE 2 Homework(for credit POW 1 posted-due on Jan 26 Material from Last Lecture Todays Topics

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1 CH 318 N LECTURE 2 Textbook Assignment: Chapter 12 Homework (for credit): POW 1 posted-due on Jan. 26 Material from Last Lecture: Today’s Topics: IR, theory & interpretation Notice & Announcements: 1)TA Office hrs- Fridays 2-3 Cubicle A 2) Exam scheduled on 3/25 will be rescheduled Organic Lecture Series 2 OH H 2 SO 4 Major + Minor Reactions will often give a mixture of products: How would the chemist determine which product was formed? Both are cyclopentenes; they are isomers. Spectroscopy will provide the solution.

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2 Organic Lecture Series 3 Traditional Depiction of the Electromagnetic Spectrum Organic Lecture Series 4
3 Organic Lecture Series 5 • 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 • Hertz (Hz): Hertz (Hz): the unit in which radiation frequency is reported; s -1 (read “per second”) Electromagnetic Radiation Organic Lecture Series 6 Electromagnetic Radiation • Common units used to express wavelength λ Angstrom (Å) 1 Å = 10 -10 m Relation to Meter Unit 1 mm = 10 -3 m 1 nm = 10 -9 m 1 μ m = 10 -6 m Nanometer (nm) Micrometer ( μ m) Millimeter (mm) Meter (m) ---- E = h ν E is kJ/mol h = 3.99 X 10 -13 kJ z s z mol -1 ν = frequency in Hz c = λν

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4 Organic Lecture Series 7 E=h ν Organic Lecture Series 8 • Molecular spectroscopy: Molecular spectroscopy: the study of which frequencies of electromagnetic radiation are absorbed or emitted by a particular substance and the correlation of these frequencies with details of molecular structure – three types of molecular spectroscopy: Vibrational energy levels Nuclear spin states Electronic energy levels Infrared Radio fequency Ultraviolet- visible Absorption of Electromagnetic Radiation Results in Transition Between Region of the Electromagnetic Spectrum Nuclear magnetic reso nan ce Infrared Ultraviolet- visible Type of Spectroscopy
5 Organic Lecture Series 9 Infrared Spectroscopy • The vibrational IR extends from 2.5 x 10 -6 m (2.5 μ m) to 2.5 x 10 -5 m (25 μ m)

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## This note was uploaded on 04/20/2009 for the course CH 318N taught by Professor Willson during the Spring '08 term at University of Texas at Austin.

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318-2 - CH 318 N Textbook Assignment Chapter 12 LECTURE 2 Homework(for credit POW 1 posted-due on Jan 26 Material from Last Lecture Todays Topics

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