6533b850fe1ef96bd12a82af

RESEARCH PRODUCT

Complexes of organometallic compounds. XLVIII. Mössbauer and other studies on pyrazine derivatives of tin(IV) compounds. A relationship between isomer shift and charge on tin

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Abstract Adducts RSnCl 3 ·pyz (R = Me, Bu n , Oct n , Ph; pyz = pyrazine) have been synthesized and characterized in the solid state. It has been determined that RSnCl 3 ·pyz are polymeric compounds, where the ligand acts as bridging bis-monodentate and the tin atoms attain the coordination number six. This has been duduced from: i) temperature dependent Mossbauer spectroscopy; ii) the correlation between Mossbauer isomer shift, δ, and electrical charge on tin, Q Sn , concerning pyrazine adducts of RSnCl 3 and others; iii) an infrared study of the coordinated ligand in RSnCl 3 ·pyz. Other implications of the Mossbauer T dependent study ( e.g. , the decrease of the Debye temperature in RSnCl 3 ·pyz with increasing of R), as well as of the δ/Q Sn correlation ( e.g. , the occurence of linear dependences as function of the Sn coordination number, using Q Sn from the method of Jolly and Perry [11, 12], are presented and discussed. The skeletal configuration around tin is lastly studied by point-charge model calculations of Mossbauer partial quadrupole splitting due to pyz/2, and of ΔE of RSnCl 3 ·pyz. A structure with meridional Cl 3 and trans -N 2 is proposed.