310-6 - Organic Lecture Series CH 310 N LECTURE 6 Textbook...

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Organic Lecture Series 1 CH 310 N LECTURE 6 Textbook Assignment: Chapter 12 (IR) up to 12.4 Homework (for credit): POW 2 posted (Due Feb 8) Today’s Topics: IR-introduction; theory; interpretation Notice & Announcements: TA office hrs posted to BB Organic Lecture Series 2
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Organic Lecture Series 3 • 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 Know these definitions Organic Lecture Series 4 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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Organic Lecture Series 5 E=h ν Organic Lecture Series 6 • 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 re so nan ce Infrared Ultraviolet- visible Type of Spectroscopy ;
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Organic Lecture Series 7 • The vibrational IR extends from 2.5 x 10 -6 m (2.5 μ m) to 2.5 x 10 -5
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This note was uploaded on 04/24/2011 for the course CH 56255 taught by Professor Colapret during the Spring '11 term at University of Texas.

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310-6 - Organic Lecture Series CH 310 N LECTURE 6 Textbook...

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