Synthesis and tin-119 nuclear magnetic resonance studies of trichlorostannate(II) complexes of ruthenium, osmium, and iridium

Abstract

The synthesis and ¹¹⁹Sn n.m.r. characteristics of the complexes trans-[NMe₄]₄[RuCl₂(SnCl₃)₄], [PPh₄]₄[Ru(SnCl₃)₆], [PPh₄]₄[Os(SnCl₃)₆], and trans-[PPh₄]₃[IrCl₂(SnCl₃)₄] are reported. In solution the trans iridium complex slowly isomerizes to give the cis isomer. The ¹¹⁹Sn chemical shifts for the ruthenium complexes move progressively to lower field with increasing number of SnCl₃^– ligands. The values ²J(¹¹⁹Sn^–117Sn)_trans vary from 11 250 to 40 759 Hz and are dependent upon the metal and the number of SnCl₃^– ligands. Values of 756 and 1 123 Hz have been found for ¹J(⁹⁹Ru^–119Sn) and ¹J(¹⁸⁷Os^–119Sn) of [Ru(SnCl₃)₆]^4– and [Os(SnCl₃)₆]^4–respectively.