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Dr. Gerd GemmeckerRoom 5333aPhone 2-8619

e-mail gemmecker@chem.wisc.eduGerd.Gemmecker@ch.tum.de

Chemistry 843 "Advanced NMR Spectroscopy" Gerd Gemmecker, 1999

This course will cover the theory required to understand and successfully implement the methods of

state-of-the-art NMR spectroscopy, with the stress laid on structure elucidation by multidimensional

(essentially 2D) NMR techniques.

What will be covered?What will be covered?

Introduction to the principles of NMR (including build-up of an NMR spectrometer, general

features of Fourier transform, relaxation, folding, sensitivity etc.)

theory required for the understanding of important experiments (Cartesian product operators)

a selection of the most widely-used 2D NMR techniques

interpretation of these spectra

and what not?

quantum mechanical treatment of NMR (although some equations willoccur!!!)

solid state NMR working with NMR data bases

empirical correlations for chemical shifts (increment systems)

What is required?

knowledge of 1D NMR, J coupling patterns, chemical shift etc., e.g., Chemistry 605 or 626

regular (!) attention of the course, since most "individual sections" require an understanding of

the previous ones.

"re-reading" (and "re-thinking"!) of the material on a regular basis, and working out your ownsolutions to the problems given in the course to make sure that you have reallygraspedthe

concepts and developed a working knowledge!

Credits / Grades:

For credit, a report is required on an aspect of this course relevant to one's own research, or a

research proposal.

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Some literature recommendations

Monographs

A.Abragam "The principles of Nuclear Magnetism", Oxford University Press, 1978 (6. Auflage),

ISBN 0-198-51236-9.

(physics, very gut & very difficult to understand, the "old testament" of NMR)

R. R. Ernst, G. Bodenhausen, A. Wokaun "Principles of NMR in One and Two Dimensions",

Oxford Science Publ. 1987, ISBN 0-198-55647-0.

(physical chemistry, very exact & very difficult, the "new testament")

O. W. Srensen, G. W. Eich, M. H. Levitt, G. Bodenhausen, R. R. Ernst, Progr. NMR Spectrosc.

16, 163-192 (1983).(the original article about product operators, but very readable! if you skip some paragraphs)

R. K. Harris "Nuclear Magnetic Resonance Spectroscopy, A Physicochemical View", Longman

Scientific & Technical 1986, ISBN 0-582-44653-8.

(easily readable introduction to basic concepts, no modern techniques)

J. N. S. Evans "Biomolecular NMR Spectroscopy", Oxford University Press 1995, ISBN 0-198-

54766-8 (QP519.9.N83E94 1995).(stress on biomolecular NMR, incl. proteins & nucleic acids, but also including a compact, yet

concise introduction, nice book, reasonably priced)

H. Kessler, M. Gehrke, C. Griesinger,Angew. Chem. Int. Edn. Engl.1988, 27, 490-536.

( good review on all 2D techniques, incl. product operator explanation, still up to date)

W. R. Croasmun, W. M. K. Carlson, ed. "Two-Dimensional NMR Spectroscopy; Applications for

Chemists and Biochemists", VCH 1994, ISBN 1-56081-664-3 (QD/96/N8/T87/1987).(mixture of introductory and application chapters, on heteronuclear spectroscopy etc., expensive)

D. Shaw, "Fourier Transform NMR Spectroscopy", Elsevier Scientific Publishing Co., New

York, 1976 (Res. QC/762/S45/2/1984).

(good on principle and features of FT, otherwise outdated)

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H. Friebolin, "Basic One- and Two-Dimensional NMR Spectroscopy", VCH, 2nd ed., 1993

(QP519.9/N83/F7513/1993).

(introduction into principles and applications of 2D NMR, not much 2D theory)

J. K. M. Sanders, B. K. Hunter, "Modern NMR Spectroscopy, A Guide for Chemists", OxfordUniversity Press, 2nd ed. 1993 (QD/96/N8/S25).

(no product operator description, but very good description of applications for 2D techniques,

incl. example spectra).

J. Cavanagh, W.J. Fairbrother, A. G> Palmer III, N. J. Skelton, "Protein NMR Spectroscopy,

Principles and Practice", Academic Press, San Diego 1996, ISBN 0-12-164490-1 (QP551.P69726

1995)

(Lots of theory, quantum-mechanics & product operators, FT, relaxation measurements, despite

title large section on 2D methods)

Journals

J. Magn. Reson.

(technical & theoretical

developments, also solid state

& imaging)

Magn. Reson. Chem.

(applications and data on

compounds; review-like papers

on practical aspects of NMR

techniques, processing etc.)

J. Biomol. NMR

(methods development &

biomolecular applications)

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"First Exam"

1. What do the following acronyms stand for?

NMRFT

COSY

NOE

2. Please make a sketch of the 1H 1D spectrum of diethyl ether:

3. What's the size of the H1-H2 and the H2-H3 3J couplings?

4. What doyou expect to learn in this course?

5. Doyou have any specific subjects that you would like to be treated here?

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Applications of NMR

in synthesis

for checking the results in a fast and efficient way, concern. connectivity purity.

determination of solution structurewith similar accuracy as x-ray analysis, allowing to detect differences between crystall

and solution structure, as well as influence of solvent.

currently limited to ca. 10 kDa without isotopic labeling, ca. 30-40 kDa with isotope 13C,15N (and 2H) labeling (proteins & nucleic acids).

investigating intermolecular interactions

mostly for biologically active compunds, e.g.,

enzyme - inhibitor

DNA - intercalator or repressor

receptor - hormon oder substrate

antibody - antigen

important, since all biological functions are based on intermolecular interactions, quite

often in a very complex way (complexes higher than binary)

molecular dynamicsfrom relaxation measurements, the dynamic behaviour of molecules can be derived on

various time scales important for understanding chemical & biochemical reactivity,

protein folding etc.

General course of an NMR study

from simple to increasingly complex models, e.g.,

1. selecting the nucleus to be studied (mostly1H or

13C), often limited by the availability

of larger amounts of the substanceand solubility (isotopic labeling).

2. optimizing measurement conditions (temperature, solvent, etc. - often skipped in

routine NMR for organic synthesis)

3. assigning the resonances to the individual atom positions; for less complex molecules

this can be done from 1D spectra considering the following parameters:

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a) "signal intensities" (integrals!) proportional to number of nuclei

b) characteristic chemical shifts

c) Jcoupling patterns (to find neighbouring positions connected by bonds)

d) line widths (dependent on local flexibility, chemical exchange, proximity

to quadrupolar nuclei or paramagnetic species)

a complete assignment is a reliable proof for the postulated connectivity / formula;

4. after that, conformationally sensitive parameters can be used to derive information

about the 3D arrangement, mostly J couplings and NOE effects.

5. additional experiments for measuring relaxation and exchange rates give additional

information on dynamic aspects.

Structural theory NMR equivalent

alchemy qualitative composition choice of nucleus / isotope

LIEBIG quantitative composition signal intensities / integrals

GERHARD &

LAURENT

functional groups chemical shifts

KEKUL &

COUPER

connectivity J coupling

VAN'T HOFF &

BARTON

spactial arrangement of atoms NOE distances

J couplings dihedrals

KARPLUS dynamics relaxation & exchange rates