Magnetic structure characterization

To obtain statistically significant comparisons of ordered and disordered sequences, much larger datasets were needed. To this end, disordered regions of proteins or wholly disordered proteins were identified by literature searches to find examples with structural characterizations that employed one or more of the following methods (1) X-ray crystallography, where absence of coordinates indicates a region of disorder (2) nuclear magnetic resonance (NMR), where several different features of the NMR spectra have been used to identify disorder and (3) circular dichroism (CD) spectroscopy, where whole-protein disorder is identified by a random coil-type CD spectrum. 

First attempts to obtain 3d-4f-based regular chains were made with Cu-Tb chains that show characteristic features of SCM but without structural characterization [84, 85]. Similarly, Co - Dy based chains were obtained but showed very weak x" lx ratio making the analysis of the magnetic slow relaxation difficult [86]. Lastly, some magnetic interplay between manganese oxide chains and Dy09 units... 

Cook, R. L. and Langford, C. H. (1998). Structural characterization of a fulvic acid and a humic acid using solid-state ramp-CP-MAS 13C nuclear magnetic resonance, Environ. Sci. Technol., 32, 719-725. 

The convenient NMR observables depend on the characteristics of the system studied, but generally the protons of the liquid are readily detected. The apparent NMR linewidths are often determined by the magnetic susceptibility inhomogeneities in the sample and do not directly reflect the dynamics of the liquid. This report will focus largely on theoretical approaches to understand the spin-lattice relaxation rate constants for both classes of microporous materials. The magnetic held dependence of the spin-lattice relaxation rate constant generally provides a useful dynamical characterization of the liquid and often a structural characterization of the confining media. 

Two iron(III) complexes of unsymmetrically substituted tris(2-pyridylmethyl)amine (tpa, (58)) tripodal ligands, [Fe(59)Cl3] and [Fe(60)Cl3], have been synthesized and structurally characterized." The crystal structure, magnetic susceptibility, Mossbauer spectroscopy and photomagnetism of the iron(II) complex [Fe(bpmae)(2,2 -bisimidazole)](C104)2 2F[20, where bpmae is the unsymmetrical tripod N CH2(2-pyridyl)2 (CH2CH2NH2), have been established." ... 

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