Abstract
Infrared and Mössbauer spectra have been obtained for eighteen complexes of divalent tin. Absorptions attributed to NH 2 stretching and deformation vibration in metal complexes indicate that the order of nitrogen-to-metal dative bond strengths is N→Cd>N→Sn II>N→Pb II. Carboxylate frequency shifts indicate that the OCOSn bond has a greater covalent character than the OCOCu II bonda. The large positive isomer shifts for stannous chloride and stannous bromide decrease on complex formation with organic ligands, the decreases being greater for the chloride, and the isomer shifts become smaller with increasing coordination number of tin. All complexes of tin(II) investigated show quadrupole splittings, the largest being observed for Sn(oxine) 2.
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