The proton magnetic resonance spectra of aethyltinchlorides

The spectra of the aethyltinchlorides (C2H5)nSn‐Cl4‐n have been recorded for the pure compounds and for their solutions in water. By comparison with previous data and using the special features of the tin satellites the complex A3B2X spectra could be analyzed by simple first order approximations. The internal chemical shift data are explained by the combined effects of polarization and diamagnetic anisotropy. The coupling constants over three bonds (JSn‐HA) are always greater than those over two bonds (JSn‐HB). It can be concluded that the Fermi‐contact interaction is dominating but other factors, the exact nature of which is uncertain, also influence the coupling constants. It is shown that the coupling constants bear no direct relationship with the percent s‐character of the tin hybrid orbitals.