U9Sn NMR Spectroscopy of Some Iron-Tin Compounds - First Measurements of One-Bond Coupling Constants
نویسندگان
چکیده
Carbonyliron tin complexes CpFe(CO)2-S n M e3 (1), a5-(CO)4Fe(SnMe3)2 (2), cis(CO)4Fe(SnMe2Cl)2 (3), [R2SnFe(CO)4]2 (4a, R = Me; 4b, R = Bu), {Me2Sn[Fe(CO)4]2}2Sn (5), Me2Sn[Fe(CO)4]2Sn[Fe(CO)4]2 (6) and Sn[Fe(CO)4]4 (7) were studied by ll9Sn NM R. It proved possible for the first time to observe coupling constants './(119Sn57Fe) in the range of 36 to 64 Hz. The large magnitude of geminal coupling constants 12/ ( 119SnFell9Sn)| (1400 to 1800 Hz) in the cyclic compounds 4 to 6 indicates the presence of tin-tin interactions as an efficient coupling pathway. Extreme deshielding of 119Sn nuclei in the complexes 6 (<5u9Sn + 953) and 7 (<5119Sn + 1532) is associated with three-centre FeSnFe bonds in these compounds.
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