Deuterium isotope effects on the 119Sn shielding constants and spin-spin coupling constants in stannane and the stannonium cation

Abstract

Deuterium induced isotope effects on the 119Sn chemical shielding constants have been measured for stannane and the stannonium cation; they are found to be approximately -0.403 ppm/D and -0.05 ppm/D respectively. The 119Snshifts in the series SnDnH4-n (n ≤ 4) deviate from additivity as predicted by Jameson and Osten. The primary and secondary isotope effects on Sn-H spin-spin coupling for stannane were obtained and are -2.8 Hz and - 1.7 Hz respectively. The primary isotope effect for Sn-H spin-spin coupling for the stannonium cation was found to be - 11.6 ± 7 Hz; an accurate value for the secondary isotope effect on the spin-spin coupling could not be obtained. The derivative of the 119Sn shielding constant and J (Sn,H) with respect to extensions in the equilibrium bond length have been calculated for stannane.