Standard NMR Spectra

Cyclodextrins and Their Complexes. Edited by Helena Dodziuk Copyright 2006 WILEY-VCH Verlag GmbH Co. KGaA, Weinheim ISBN 3-527-31280-3 

The factor 10 is introduced for convenience and, therefore, the chemical shift is expressed in parts per million (ppm). 

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B-74MI50503 Sadder Standard NMR Spectra , Sadder Research Laboratories, Philadelphia,... 

NMR Measurement 0.3 g of monomer was dissolved in 1 g of CDCI3 using TMS as internal standard. NMR spectra were run using a Varian A-60A proton NMR instrument at 23°C. 

The H data are abstracted from The Sadder Standard NMR Spectra, Sadder Research Laboratories, Division of Bio-Rad Laboratories, Philadelphia, 1972. The 13C data are abstracted from The Sadtler Guide to Carbon-13 NMR Spectra, Simons, W. W., Ed., Sadtler Research Laboratories, Division of Bio-Rad Laboratories, Philadelphia, 1983. 

Fig. 14. (a) Temperature-dependent, standard NMR spectra (500 MHz) of the methyl protons in... 

One reason that chemists evaluate the d orbital count is to determine if the metal complex is diamagnetic or paramagnetic. A diamagnetic complex has all electrons paired. NMR spectra with chemical shifts similar to organic compounds can be obtained for these structures. A paramagnetic complex has one or more unpaired electrons. Very often, standard NMR spectra for these structures cannot be obtained. Either the resonances are so broad that they cannot be detected, or the chemical shifts are spread over an unusually wide ppm range. 

Integration of standard NMR spectra is not meaningful, but in general signals from carbon atoms with directly attached protons are more intense than those from quaternary carbon atoms. 

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