Solid-state nuclear magnetic resonance studies of triphenylsilyl-, triphenyltin-, and triphenyllead(pentacarbonyl)manganese(I) complexes

The solid-state CP MAS (Si-29, Sn-119, and Pb-207) NMR spectra of the triph enylsilyl-, triphenyltin-, and triphenyllead(pentacarbonyl)manganese(I) com plexes, (Ph3E)Mn(CO)(5) (E = Si, Sn, Pb), have been analyzed to give the ch emical shifts, one-bond spin-spin coupling constants, (1)J(E-Mn), the "effe ctive-dipolar" coupling constants (D - Delta J/3), the chemical shift tenso rs, and the spin-spin anisotropy (Delta J), where the analysis permits. For the tin and lead compounds, three and four sets of chemical shifts, respec tively, were observed, and two different polymorphs occur for the lead comp lex, depending on the solvent used for recrystallization. The avenge values of the reduced coupling constants, K-1(Mn-Si) (2.64 x 10(20) T-2 J(-1)), K -1(Sn-Mn) (1.25 x 1020 T2 J(-1)),,d K-1(Pb-Mn) (4.18 x 10(20) T-2 J(-1)) sh owed a linear correlation with the s-electron densities at the respective m etal nuclei. The principal components of the chemical shift tensors have be en determined for the tin and lead compounds.