Mössbauer Spectroscopy of Organometallic Compounds in Noncrystalline Matrices
The frozen-glassy-matrix technique has been employed in a study of the lattice dynamics of a number of organo-iron and organotin compounds, This technique has also been exploited in determining possible conformational changes on dissolution of the crystalline solids in solvents which set to a glassy matrix at cryogenic temperatures. The choice of solvent primarily depends on (1) a reasonably high lattice temperature compared to kT (2) nonreactivity with the solute under study, and (3) the property of forming a glassy (noncrystalline) structure on cooling. Mössbauer studies on C8H8Fe(CO)3, [C5H5Fe(CO)2]2SnCl2, and C5H5Fe(CO)2Sn(C6H5)3 as neat solids and as solutes in polymethylmethacrylate in the temperature range 298 ≥ T ≥ 78°K are reported. Far-infrared studies previously reported for these compounds show the presence of low-lying optical modes at about 100 cm-1. By studying both Fe57 and Sn119 spectra the contribution of the optical modes toward the Mössbauer fraction can be determined from the nonconstancy of the area ratio of two resonance spectra in different matrices.
KeywordsMossbauer Spectroscopy Isomer Shift Organometallic Compound Freeze Solution Organotin Compound
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