Hyperfine Interactions • EPR signal is ‘split’ by neighboring nuclei • Called hyperfine interactions • Can be used to provide information • Number and identity of nuclei • Distance from unpaired electron • Interactions with neighboring nuclei E = gmBB0MS + aMsmI a = hyperfine coupling constant mI= nuclear spin quantum number • Measured as the distance between the centers of two signals, Which nuclei will interact? It's FREE! a recap of particles an intro d sj spectroscopy x,y,z states charmed baryons measurement, NMR Spectroscopy - . ELECTRON SPIN RESONANCE SPECTROSCOPY 1. Because the electron is a spin ½ particle, the parallel state is designated as m s EPR spectroscopy ... - What Kind of States? Since electron spin resonance is an excellent analytical method for paramagnetic species and free radicals, it can be used to obtain a variety of kinetic and thermodynamic data. Many of them are also animated. nuclear magnetic resonance (nmr), ATOMIC SPECROSCOPY (AS) - . - Beautifully designed chart and diagram s for PowerPoint with visually stunning graphics and animation effects. enrico, Trend in Charm Spectroscopy - . - Proton Nuclear Magnetic Resonance (1H-NMR) Spectroscopy Part 1 Lecture Supplement: Take one handout from the table 1H-NMR Spectroscopy Background and Theory ... Chapter 13 Nuclear Magnetic Resonance Spectroscopy. Our new CrystalGraphics Chart and Diagram Slides for PowerPoint is a collection of over 1000 impressively designed data-driven chart and editable diagram s guaranteed to impress any audience. Last lecture, we saw that the electron had a magnetic moment, µ orbit = − e 2me Lˆ, due to orbital degrees of freedom. Electron Spin Resonance, ESR, is a powerful non-destructive and non-intrusive analytical method. And, best of all, most of its cool features are free and easy to use. Introduction Electron spin resonance (ESR)1 has developed over the past several decades as a technique to provide information on the electronic structure of organic, inorganic, biological, solid state, and surface molecular species. brief discussion of principle, instrumentation and applications lecture supplement: take one handout from the stage. This is because in a magnetic field they can form a very simple, easily manip-ulated two state system consisting of a spin-down excited state and a spin-up ground state. X-ray Photoelectron Spectroscopy (XPS) - . Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. organic chemistry 6 th edition paula yurkanis bruice. Electron Paramagnetic Resonance Spectroscopy) • Electrons: spinning, charged particles • ‘stable’ atoms, molecules: all e-are spin-paired. free electrons or unpaired . Structure Determination: Nuclear Magnetic Resonance Spectroscopy Based on McMurry s Organic Chemistry, 7th edition * Figure 13.6: Carbon-13 NMR spectra of 1 ... NMR Diffusometry and MAS NMR Spectroscopy of Functionalized Mesoporous Proton Conductors Magic-Angle Spinning Pulsed Field Gradient Nuclear Magnetic Resonance as a New Tool for Diffusometry of Interface Materials, - NMR Diffusometry and MAS NMR Spectroscopy of Functionalized Mesoporous Proton Conductors Magic-Angle Spinning Pulsed Field Gradient Nuclear Magnetic Resonance. lecture date: january 30 th , 2008. vibrational and rotational spectroscopy. Biological Applications of Raman Spectroscopy ... - EPR (electron paramagnetic resonance) By Jonathan Spagnola. After you enable Flash, refresh this page and the presentation should play. PPT – Electron Spin Resonance Spectroscopy PowerPoint presentation | free to download - id: 3c9577-Y2VkZ, The Adobe Flash plugin is needed to view this content. required for . Presentation Summary : Electron spin has no classical equivalent. A surprisingly large number of materials have unpaired electrons. ESR Spectroscopy. It is also often called ESR (Electron Spin Resonance).  introduction to, Nuclear Magnetic Resonance (NMR) Spectroscopy - . Electron paramagnetic resonance (EPR) or electron spin resonance (ESR) spectroscopy is a method for studying materials with unpaired electrons.The basic concepts of EPR are analogous to those of nuclear magnetic resonance (NMR), but it is electron spins that are excited instead of the spins of atomic nuclei.EPR spectroscopy is particularly useful for studying metal complexes or organic radicals. Electron paramagnetic resonance (EPR) = Electron spin resonance (ESR) spectroscopy Same underlying physical principles as in nuclear magnetic resonance (NMR) One unpaired (free) electron: Zeeman effect: ∆= = ℎ (resonance condition) g: g factor for free electron: g e = 2.0023 b e: Bohr magneton Do you have PowerPoint slides to share? Since the magnetic field interacts with the spin, the spin of the system has to be . Create stunning presentation online in just 3 steps. ESR Spectroscopy. Hyperfine Interactions Interaction with a single nucleus of spin ½ Ebsworth, E. A. V.; Rankin, David W. H.; Cradock, Stephen Structural Methods in Inorganic Chemistry; CRC Press: Boca Raton, 1987. To Provide A Classical Analog PPT. Electron Spin Resonance Spectroscopy ESR Spectroscopy Electron Spin Resonance Spectroscopy Also called EPR Spectroscopy Electron Paramagnetic Resonance Spectroscopy ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 3c9577-Y2VkZ 2 CHAPTER 4. - ... spinning protons act like bar magnets. Hyperfine Interactions • Coupling patterns same as in NMR • More common to see coupling to nuclei with spins greater than ½ • The number of lines: 2NI + 1 N = number of equivalent nuclei I = spin • Only determines the number of lines--not the intensities, Hyperfine Interactions • Relative intensities determined by the number of interacting nuclei • If only one nucleus interacting • All lines have equal intensity • If multiple nuclei interacting • Distributions derived based upon spin • For spin ½ (most common), intensities follow binomial distribution, Hyperfine Interactions • Example: • VO(acac)2 • Interaction with vanadium nucleus • For vanadium, I = 7/2 • So, 2NI + 1 = 2(1)(7/2) + 1 = 8 • You would expect to see 8 lines of equal intensity, Hyperfine Interactions EPR spectrum of vanadyl acetylacetonate, Hyperfine Interactions • Example: • Radical anion of benzene [C6H6]- • Electron is delocalized over all six carbon atoms • Exhibits coupling to six equivalent hydrogen atoms • So, 2NI + 1 = 2(6)(1/2) + 1 = 7 • So spectrum should be seven lines with relative intensities 1:6:15:20:15:6:1, Hyperfine Interactions EPR spectrum of benzene radical anion, Hyperfine Interactions • Coupling to several sets of nuclei • First couple to the nearest set of nuclei • Largest a value • Split each of those lines by the coupling to the next closest nuclei • Next largest a value • Continue 2-3 bonds away from location of unpaired electron, Hyperfine Interactions • Example: • Pyrazine anion • Electron delocalized over ring • Exhibits coupling to two equivalent N (I = 1) 2NI + 1 = 2(2)(1) + 1 = 5 • Then couples to four equivalent H (I = ½) 2NI + 1 = 2(4)(1/2) + 1 = 5 • So spectrum should be a quintet with intensities 1:2:3:2:1 and each of those lines should be split into quintets with intensities 1:4:6:4:1, Hyperfine Interactions EPR spectrum of pyrazine radical anion, Conclusions • Analysis of paramagnetic compounds • Compliment to NMR • Examination of proportionality factors • Indicate location of unpaired electron • On transition metal or adjacent ligand • Examination of hyperfine interactions • Provides information on number and type of nuclei coupled to the electrons • Indicates the extent to which the unpaired electrons are delocalized, © 2020 SlideServe | Powered By DigitalOfficePro, - - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -. 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