Atomic and Molecular Motion in Iron Organometallics.
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Accession number;02A0151785
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| Title;Atomic and Molecular Motion in Iron Organometallics. |
| Author;
HERBER R H
(Racah Inst. Physics, The Hebrew Univ., Jerusalem, Israel)
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Journal Title;Abstracts of Papers. Symposium on Radiochemistry
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Journal Code:F0139B
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ISSN:1345-2762
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VOL.45th;NO.;PAGE.3(2001)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;English |
| Abstract;The temperature-dependence of the area under a Moessbauer effect resonance curve can be related to the corresponding temperature-dependence of the recoil-free fraction, and hence to the mean-square-amplitude-of vibration (msav) of the metal atom in iron organometallics, by making use of a transmission integral fitting procedure for samples showing appreciable absorption effects, and a Lorentzian fitting procedure for optically thin samples. This analysis has been validated for ferrocene [( 5C5H5)2Fe] by reference to single crystal X-ray Ui.jvalues at a number of different temperatures, and the resulting data, coupled with an analysis of the Gol'danskii-Karyagin asymmetry of the doublet spectra, yield a msav of the metal atom parallel and perpendicular to the principal symmetry axis of the ferrocene molecule. At room temperature [<x2para>]1/2= 0.226+0.008 .ANGS., while [<x2perp>]1/2= 0.179+0.010 .ANGS.. This vibrational anisotropy is also observed in a number of structurally related ferrocenoid molecules, and can be related to the molecular level architecture of these diamagnetic a solids and will be discussed in detail. (author abst.) |
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