ISSN:
0006-3525
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Measurements of Rayleigh scattering of Mössbauer radiation (RSMR) have been performed on synthetic L-Dopa melanin as a function of the scattering vector, Q, and temperature, T, and are compared with the results of X-ray diffraction analyses. The data obtained allow us to derive a radial distribution function for the atomic positions not affected by the dynamic disorder and determined only by the distribution of equilibrium interatomic distances. The mean-square atomic displacements, 〈u2〉, derived from the RSMR measurements, evidence a strong anisotropy of the atomic vibrations: even at room temperature, 〈u2〉 reaches fairly high values for off-plane displacements, as compared with those for motions within the planes of the structure. A connection is suggested between the observed dynamics and the biological screening action of melanins.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/bip.360230805
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